Article
Materials Science, Multidisciplinary
Santanu Pakhira, Farhan Islam, Evan O'Leary, M. A. Tanatar, Thomas Heitmann, Lin-Lin Wang, R. Prozorov, Adam Kaminski, David Vaknin, D. C. Johnston
Summary: In this study, the crystallographic, magnetic, and electronic properties of EuMg2Sb2 were investigated. It was found that EuMg2Sb2 exhibits narrow-gap semiconductor behavior, activated behavior with intrinsic conductivity, and antiferromagnetic ordering. The reorientation of Eu moments within the trigonal antiferromagnetic domains was also observed at low temperatures.
Article
Multidisciplinary Sciences
Xiaolong Xu, Shiqi Yang, Huan Wang, Roger Guzman, Yuchen Gao, Yaozheng Zhu, Yuxuan Peng, Zhihao Zang, Ming Xi, Shangjie Tian, Yanping Li, Hechang Lei, Zhaochu Luo, Jinbo Yang, Yeliang Wang, Tianlong Xia, Wu Zhou, Yuan Huang, Yu Ye
Summary: Natural superlattices MnBi2Te4(Bi2Te3)(n) (n=1, 2, ...) with band topology and reduced interlayer coupling provide a promising platform for exploring topological quantum states. In this study, the authors observe and investigate complex ferromagnetic-antiferromagnetic coexisting ground states in MnBi4Te7 (n=1) and MnBi6Te10 (n=2). The spatially inhomogeneous interlayer coupling and tunable exchange bias effect have been observed in MnBi2Te4(Bi2Te3)(n) (n=1, 2), providing design principles for future spintronic devices.
NATURE COMMUNICATIONS
(2022)
Article
Multidisciplinary Sciences
Zbigniew Bukowski, Damian Rybicki, Michal Babij, Janusz Przewoznik, Lukasz Gondek, Jan Zukrowski, Czeslaw Kapusta
Summary: Compounds containing Eu exhibit unique physical properties due to the interplay of electronic and magnetic properties. In this study, the growth of EuZn2As2 single crystals and their structural, electronic and magnetic properties were investigated. Experimental techniques including X-ray diffraction, electron microscopy, magnetic susceptibility, magnetization, heat capacity and Mossbauer spectroscopy were employed. The results show that Eu has a valence state of 2+ and forms a canted antiferromagnetic structure tilted from the basal plane below 19.2 K.
SCIENTIFIC REPORTS
(2022)
Article
Materials Science, Multidisciplinary
Tanya Berry, Veronica J. Stewart, Benjamin W. Y. Redemann, Chris Lygouras, Nicodemos Varnava, David Vanderbilt, Tyrel M. McQueen
Summary: This study reports the synthesis and properties of the Zintl compound EuZn2P2 and its electronic structure calculations. The experimental results show that the compound exhibits insulating behavior and undergoes antiferromagnetic ordering at lower temperatures. The magnetic measurements indicate weak anisotropy and competing ferromagnetic and antiferromagnetic interactions. These findings are important for further predictive materials design.
Article
Physics, Applied
T. W. J. Metzger, K. A. Grishunin, D. Afanasiev, R. M. Dubrovin, E. A. Mashkovich, R. V. Pisarev, A. V. Kimel
Summary: Using polarization sensitive terahertz transmission spectroscopy, this study investigates the changes in waveform of THz pulses propagating through a thick antiferromagnetic crystal of CoF2. The changes are strongly dependent on the initial polarization and temperature, and are quantified and explained in terms of magnetic linear birefringence and dichroism. The study also reveals significant changes in the polarization of THz pulses along the pulse duration.
APPLIED PHYSICS LETTERS
(2022)
Article
Chemistry, Physical
Yuqing Bai, Shuang Pan, Ziqian Lu, Yuanyuan Gong, Guizhou Xu, Feng Xu
Summary: This study investigates the magnetic and transport properties of high Cr content CrxSe single crystals. The results show that increasing the Cr content leads to a significant increase in the Neel temperature, accompanied by changes in magnetic anisotropy and hysteresis. At low temperatures, the compounds exhibit positive magnetoresistance, with non-saturated linear positive magnetoresistance observed in Cr0.91Se and Cr0.95Se.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Multidisciplinary Sciences
Somnath Ghara, Evgenii Barts, Kirill Vasin, Dmytro Kamenskyi, Lilian Prodan, Vladimir Tsurkan, Istvan Kezsmarki, Maxim Mostovoy, Joachim Deisenhofer
Summary: A fundamentally new pathway for magnetization reversal mediated by an antiferromagnetic state is reported. This process allows for atomic-scale compensation of magnetization and is different from the conventional domain cancellation. The existence of this unusual magnetization reversal in Fe2Mo3O8 is demonstrated and its mechanism is explained.
NATURE COMMUNICATIONS
(2023)
Article
Chemistry, Multidisciplinary
Chaocheng Liu, Zhi Li, Jiyu Hu, Hengli Duan, Chao Wang, Liang Cai, Sihua Feng, Yao Wang, Ruiqi Liu, De Hou, Caixing Liu, Ranran Zhang, Lin Zhu, Yuran Niu, Alexei A. A. Zakharov, Zhigao Sheng, Wensheng Yan
Summary: In this study, the Neel-type antiferromagnetic order in the 2D antiferromagnet VPS3 with out-of-plane anisotropy is experimentally probed. The long-range antiferromagnetic order persists even at the ultrathin limit. Strong interlayer exciton-magnon coupling upon the Neel-type antiferromagnetic order is detected in the monolayer WSe2/VPS3 heterostructure. This discovery provides optical routes to study 2D antiferromagnets and promotes their potential applications in magneto-optics and opto-spintronic devices.
ADVANCED MATERIALS
(2023)
Article
Chemistry, Physical
Jian-Xiang Qiu, Christian Tzschaschel, Junyeong Ahn, Anyuan Gao, Houchen Li, Xin-Yue Zhang, Barun Ghosh, Chaowei Hu, Yu-Xuan Wang, Yu-Fei Liu, Damien Berube, Thao Dinh, Zhenhao Gong, Shang-Wei Lien, Sheng-Chin Ho, Bahadur Singh, Kenji Watanabe, Takashi Taniguchi, David C. Bell, Hai-Zhou Lu, Arun Bansil, Hsin Lin, Tay-Rong Chang, Brian B. Zhou, Qiong Ma, Ashvin Vishwanath, Ni Ni, Su-Yang Xu
Summary: Using circularly polarized light, researchers have observed helicity-dependent optical control of fully compensated antiferromagnetic order in a topological axion insulator called MnBi2Te4. This optical control and circular dichroism are based on the optical axion electrodynamics and can potentially be used to control PT-symmetric antiferromagnets and create dissipationless circuits using topological edge states.
Article
Materials Science, Multidisciplinary
Qiye Liu, Le Wang, Ying Fu, Xi Zhang, Lianglong Huang, Huimin Su, Junhao Lin, Xiaobin Chen, Dapeng Yu, Xiaodong Cui, Jia-Wei Mei, Jun-Feng Dai
Summary: The Mermin-Wagner-Coleman theorem predicts the absence of long-range magnetic order in two-dimensional isotropic systems at finite temperature, but does predict quasi-long-range order at the Kosterlitz-Thouless transition for planar magnets. By utilizing magnetostriction sensitive to local magnetic order, phonon mode splitting and two-magnon signals were observed in monolayer CoPS3 below the KT transition temperature, indicating quasi-long-range order in an exact 2D planar spin model. The ratio of interlayer to intralayer interactions (J'/J) characterizing 2D behaviors was evaluated to be around 0.03, providing an efficient method to detect quasi-long-range antiferromagnetic ordering in two-dimensional magnets down to the monolayer limit.
Article
Physics, Multidisciplinary
Daniel Abutbul, Daniel Podolsky
Summary: The study demonstrates that in systems of spinful particles with strong spin interactions, lattice melting leads to a tetratic phase separating solid from liquid, containing free dislocation pairs and bound disclinations. The spins in the tetratic phase are shown to be antiferromagnetically ordered as allowed by their spatial configuration.
PHYSICAL REVIEW LETTERS
(2022)
Article
Multidisciplinary Sciences
N. S. Sangeetha, Santanu Pakhira, Qing-Ping Ding, Lennard Krause, Hyung-Cheol Lee, Volodymyr Smetana, Anja-Verena Mudring, Bo Brummerstedt Iversen, Yuji Furukawa, David C. Johnston
Summary: SrMn2P2 and CaMn2P2 are insulators with corrugated Mn honeycomb layers; they exhibit weak and strong first-order antiferromagnetic transitions at 53K and 69.8K respectively. The magnetic structures of these compounds show a mixture of first-order and second-order characteristics.
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
(2021)
Article
Materials Science, Multidisciplinary
Keishi Sunami, Taiga Takahashi, Kazuya Miyagawa, Biao Zhou, Akiko Kobayashi, Kazushi Kanoda
Summary: In this study, the pressure variation of the electronic states in Pd(tmdt)2 were investigated using 13C nuclear magnetic resonance spectroscopy. The results showed a pressure-induced quantum phase transition from an antiferromagnetic Mott insulator to a paramagnetic metal at around 9 kbar.
Article
Materials Science, Multidisciplinary
Yusuke Hirose, Kyoma Arakawa, Yuta Kato, Yoshiya Uwatoko, Hanming Ma, Jun Gouchi, Fuminori Honda, Rikio Settai
Summary: In this study, we investigated the electronic properties of Yb4Ru7As6 using single crystalline samples grown by the Bi-flux method. It was found that Yb4Ru7As6 crystallizes in the cubic U4Re7Si6-type structure and orders antiferromagnetically below the Neel temperature of 2.5 K. The material also exhibits a moderately enhanced electronic specific heat coefficient and a weak ferromagnetic component at low magnetic field below 4 K.
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
(2022)
Article
Chemistry, Physical
Yijie Niu, Haifeng Lv, Xiaojun Wu, Jinlong Yang
Summary: A general strategy is presented to control spin polarization above room temperature in 2D A-type AFM semiconductors by external electric field based on first-principles calculations. Transition metal monohalide MnCl and carbide MXenes Cr2CX2 (X = F, Cl, OH) are used as examples. The results show that 100% spin polarization can be induced around Fermi level, and the spin splitting gap is related to the spatial distribution of spin density in real space. Furthermore, the Néel temperature of 2D MnCl and Cr2CF2 remains above room temperature under external electric field up to 0.6 V/angstrom. This study reveals the potential application of 2D AFM semiconductors in electric-field-controlled spintronics.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2023)
Article
Nanoscience & Nanotechnology
Hang Chen, Shahidul Asif, Kapildeb Dolui, Yang Wang, Jeyson Tamara-Isaza, V. M. L. Durga Prasad Goli, Matthew Whalen, Xinhao Wang, Zhijie Chen, Huiqin Zhang, Kai Liu, Deep Jariwala, M. Benjamin Jungfleisch, Chitraleema Chakraborty, Andrew F. May, Michael A. McGuire, Branislav K. Nikolic, John Q. Xiao, Mark J. H. Ku
Summary: The study reports on exfoliated flakes of cobalt-substituted Fe5GeTe2 (CFGT) that exhibit magnetism above room temperature. Ferromagnetism at room temperature was observed in CFGT flakes as thin as 16 nm using quantum magnetic imaging. This expands the portfolio of thin room temperature 2D magnet flakes exfoliated from robust single crystals.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Chemistry, Physical
Yan Wan, Jinlong Jiao, Gaoting Lin, Yan Wu, Xiaoming Wang, Ranran Zhang, Qiyang Sun, Wei Tong, Guohua Wang, Qingyong Ren, Jinfeng Zhu, Binru Zhao, Meng Zhang, Minnan Chen, Jonas Weissenrieder, Xin Yao, Jie Ma
Summary: The orbital effect on the anomalous magnetism and evolution of single crystals with low La doping has been studied. It is found that substituting Y3+ by La3+ increases the degeneracy of the yz/zx orbitals and decreases the Jahn-Teller distortion, weakening the G-type orbital ordering phase. Furthermore, the substituting decreases the magnetism entropy, indicating the shrinking of the t2g and eg orbital hybridization, destabilizing the C-type antiferromagnetic ordering phase.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Materials Science, Multidisciplinary
J. -q. Yan, M. A. McGuire
Summary: This paper introduces a less well-known vapor transport technique called self-selecting vapor growth, and reports on the growth of transition-metal halides using this technique. The research shows that the self-selecting vapor transport technique can provide large single crystals of transition-metal halides, demonstrating its potential for providing high-quality single crystals of quantum materials.
PHYSICAL REVIEW MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Martin Endres, Artem Kononov, Hasitha Suriya Arachchige, Jiaqiang Yan, David Mandrus, Kenji Watanabe, Takashi Taniguchi, Christian Schoenenberger
Summary: In this study, we measured a 4N-periodic switching current through an asymmetric SQUID formed by the higher-order topological insulator WTe2. We found that a high asymmetry in critical current and negligible loop inductance alone were not sufficient to reliably measure the current-phase relation. Instead, we discovered that our measurement was heavily influenced by additional inductances originating from the self-formed PdTex inside the junction. We developed a method to numerically recover the current-phase relation and found that the 1.5 μm long junction was best described in the short ballistic limit. Our results highlight the complexity of subtle inductance effects that can lead to misleading topological signatures in transport measurements.
Article
Crystallography
Michael A. A. McGuire, Eleanor M. M. Clements, Qiang Zhang, Satoshi Okamoto
Summary: This article investigates the properties of Pt3X2 (X = In and Tl), which adopt a double-layer kagome net structure related to topologically nontrivial compounds Fe3Sn2 and V3Sb2. Through various measurements and calculations, it is found that the Fermi levels of Pt3X2 lie in pseudogaps, and several bands contribute to transport. Despite the extended nature of the Pt 5d states, the observed moderately large and non-saturating magnetoresistance values and quantum oscillations suggest the presence of the kagome nets in Pt.
Article
Crystallography
Duncan H. H. Moseley, Craig A. A. Bridges, Luke L. L. Daemen, Qiang Zhang, Michael A. A. McGuire, Ercan Cakmak, Raphael P. Hermann
Summary: Antimony oxides are important for catalysis and flame-retardant applications. Although the lattice dynamics properties of alpha-Sb2O3 and beta-Sb2O3 have been extensively studied, their anharmonicity and low-temperature structural information have not been directly investigated. In this study, we report the powder neutron diffraction data and structural information of both phases, revealing a small region of zero thermal expansion in beta-Sb2O3 along the c axis and a deviation in atomic displacement parameters in alpha-Sb2O3. These findings provide valuable insights for further investigations.
Article
Materials Science, Multidisciplinary
Andrew F. May, Eleanor M. Clements, Heda Zhang, Raphael P. Hermann, Jiaqiang Yan, Michael A. McGuire
Summary: EuCuP and EuCuAs were studied to investigate their magnetic phase transitions and magnetoelastic coupling. EuCuP exhibited two closely spaced features in thermal expansion and specific heat capacity around the Curie temperature, possibly indicating a cascading magnetic transition or an electronic transition closely coupled to the magnetic ordering. Stronger zero-field magnetoelastic coupling was observed in EuCuP compared to EuCuAs, which was attributed to the dominant ferromagnetic interaction in EuCuP and antiferromagnetic order in EuCuAs. Anisotropic thermal expansion and strong ferromagnetic correlations were observed in EuCuAs above T-N. Both compounds showed similar electrical and thermoelectric transport behaviors, suggesting intrinsic defects and potential for achieving narrow-gap semiconducting or semimetallic behavior with defect tuning.
PHYSICAL REVIEW MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
Michael A. McGuire, Heda Zhang, Andrew F. May, Satoshi Okamoto, Robert G. Moore, Xiaoping Wang, Clement Girod, Sean M. Thomas, Filip Ronning, Jiaqiang Yan
Summary: Alloying indium into SnBi2Te4 induces bulk superconductivity with critical temperatures up to 1.85 K and upper critical fields up to about 14 kOe. This is confirmed by electrical and thermal measurements, and the presence of a superconducting gap near 0.25 meV is suggested. The superconductivity is type-II and the existence of topological surface states has been verified. The analogy with MnBi2Te4 motivates further interest in this family of compounds, which have potential for the study of topological superconductivity.
PHYSICAL REVIEW MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
Hung-Yu Yang, Jonathan Gaudet, Rahul Verma, Santu Baidya, Faranak Bahrami, Xiaohan Yao, Cheng-Yi Huang, Lisa DeBeer-Schmitt, Adam A. Aczel, Guangyong Xu, Hsin Lin, Arun Bansil, Bahadur Singh, Fazel Tafti
Summary: We investigate the magnetic and electronic transport properties of NdAlGe, a Weyl semimetal which breaks inversion and time-reversal symmetries. The material displays an incommensurate spin density wave and transitions to a commensurate ferrimagnetic state at low temperatures. Small-angle neutron scattering reveals the formation of ferrimagnetic domains with different characteristic length scales in real space. Interestingly, unlike NdAlSi, NdAlGe exhibits two different regimes of anomalous Hall effect, one governed by intrinsic Berry curvature and the other by extrinsic disorders/spin fluctuations.
PHYSICAL REVIEW MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Daniel J. Rizzo, Jin Zhang, Bjarke S. Jessen, Francesco L. Ruta, Matthew Cothrine, Jiaqiang Yan, David G. Mandrus, Stephen E. Nagler, Takashi Taniguchi, Kenji Watanabe, Michael M. Fogler, Abhay N. Pasupathy, Andrew J. Millis, Angel Rubio, James C. Hone, Cory R. Dean, D. N. Basov
Summary: The use of work-function-mediated charge transfer is explored for nanoscale electrostatic control of atomic layers. A thin layer of a-RuCl3 is found to induce emergent nano-optical behavior in hBN through interlayer charge polarization. The propagation length of hBN phonon polaritons is significantly reduced by the interfacial dipole formed by a-RuCl3, and a novel resonance is observed in nano-optical spectroscopy experiments. These findings demonstrate the potential of charge-transfer heterostructures for tailoring optoelectronic properties of 2D insulators.
Article
Chemistry, Multidisciplinary
Wonhee Ko, Sang Yong Song, Jiaqiang Yan, Jose L. Lado, Petro Maksymovych
Summary: This study introduces the unique capability of tunneling Andreev reflection (TAR) to probe unconventional pairing symmetry in low-dimensional unconventional superconductors. By studying the paradigmatic FeSe superconductor, we provide direct evidence of sign-changing order parameter, reveal the existence of two superconducting gaps, and confirm the local suppression of superconductivity along the nematic twin boundary. These findings enable new atomic-scale insight into microscopic, inhomogeneous, and interfacial properties of emerging quantum materials.
Article
Multidisciplinary Sciences
Yuguang Pu, Duncan Moseley, Zhen He, Krishna Chaitanya Pitike, Michael E. Manley, Jiaqiang Yan, Valentino R. Cooper, Valerie Mitchell, Vanessa K. Peterson, Bernt Johannessen, Raphael P. Hermann, Peng Cao
Summary: Researchers have developed a bottom-up method for synthesizing rocksalt high-entropy oxides (HEOs) containing Mn and Fe. They investigated the crystal structure and random cation-site occupancy of FeO-HEO, showing improved structural robustness and the viability of an oxygen sublattice as a buffer layer. Compositional analysis revealed the valence and spin state of the iron species, and the antiferromagnetic order of FeO-HEO below a transition temperature around 218 K was reported, along with predictions for the phase stability conditions of Mn and Fe-containing HEOs.
Article
Materials Science, Multidisciplinary
J. Gaudet, H. -y. Yang, E. M. Smith, T. Halloran, J. P. Clancy, J. A. Rodriguez-Rivera, Guangyong Xu, Y. Zhao, W. C. Chen, G. Sala, A. A. Aczel, B. D. Gaulin, F. Taft, C. Broholm
Summary: The magnetism of a rocksalt fcc rare-earth monopnictide HoBi, a topological material candidate with extreme magnetoresistance, is studied. The cubic crystal electric field of the Ho3+ non-Kramers J = 8 spin-orbital multiplet results in six nearly degenerate low-energy levels, forming an anisotropic magnetic moment coupled to the lattice. The paramagnetic neutron scattering in the cubic phase for T > TN = 5.72(1) K indicates dominant antiferromagnetic interactions between 2 2 Ho spins separated by {100} and ferromagnetic interactions between spins displaced by { 1 20}, while a type-II AFM long-range order with k = (1 1 2) and tetragonal lattice distortion develops for T < TN.
Article
Materials Science, Multidisciplinary
C. Dhital, R. L. Dally, R. Ruvalcaba, R. Gonzalez-Hernandez, J. Guerrero-Sanchez, H. B. Cao, Q. Zhang, W. Tian, Y. Wu, M. D. Frontzek, S. K. Karna, A. Meads, B. Wilson, R. Chapai, D. Graf, J. Bacsa, R. Jin, J. F. DiTusa
Summary: The magnetic structure, magnetoresistance, and Hall effect of the noncentrosymmetric magnetic semimetal NdAlGe are investigated. The study reveals an unusual magnetic state and anomalous transport properties that are associated with the electronic structure of the compound. The presence of Weyl nodes contributes to the large anomalous Hall conductivity.