Article
Nanoscience & Nanotechnology
J. R. Hortensius, D. Afanasiev, L. Vistoli, M. Matthiesen, M. Bibes, A. D. Caviglia
Summary: In this study, we use a femtosecond all-optical pump-probe scheme to photodope the antiferromagnetic parent manganite system CaMnO3 and investigate the formation dynamics of a long-range ferromagnetic state. By employing time-resolved terahertz spectroscopy and time-resolved magneto-optical Faraday measurements, we demonstrate that photodoping leads to the generation of long-lived delocalized electrons and induces net magnetization, thereby promoting ferromagnetism through light-induced carrier-mediated short-range double-exchange interactions.
Article
Materials Science, Multidisciplinary
V. Apinyan, T. K. Kopec
Summary: This paper investigates the antiferromagnetic and excitonic correlations in AA-stacked bilayer graphene, considering the impact of an external electric field potential and different particle-filling regimes. The study reveals that antiferromagnetism and excitonic phases can coexist away from half-filling, with the presence of a critical Coulomb interaction potential determining the transition between single-valued and triple-valued excitonic states.
Article
Materials Science, Multidisciplinary
Fei Gao, Weijun Ren, Yanxin Zhuang, Xinguo Zhao, Bing Li, Zhidong Zhang
Summary: The study found a large magnetocaloric effect in the antiferromagnetic compound ErAl2Ge2, with even larger magnetic-entropy changes in single crystal form. By utilizing the anisotropy of the crystal, significant rotating magnetic-entropy changes were observed, indicating potential use of single crystal or textured ErAl2Ge2 in rotating magnetic refrigeration systems.
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
(2021)
Article
Materials Science, Multidisciplinary
Rafael M. P. Teixeira, Catherine Pepin, Hermann Freire
Summary: We compute the transport and thermodynamic properties of a two-dimensional free fermion model using a quantum Monte Carlo approach. Our results show that the model exhibits a d-wave superconducting phase at low enough temperatures. Additionally, we find that the model also describes a non-Fermi-liquid metallic regime above the superconducting transition temperature, with an approximately linear resistivity for strong fermion-boson interaction.
Article
Materials Science, Multidisciplinary
M. C. Rahn, A. Gallagher, F. Orlandi, D. D. Khalyavin, C. Hoffmann, P. Manuel, R. Baumbach, M. Janoschek
Summary: The hidden order phase in URu2Si2 is highly sensitive to electronic doping, and the substitution of silicon with phosphorus can isolate the effects of tuning the chemical potential to some extent. This substitution induces a new antiferromagnetic phase with localized magnetic moments, and enhanced exchange interactions due to chemical pressure lead to magnetic order. Comparison with other tuning studies of URu2Si2 helps delineate the mechanisms by which silicon-to-phosphorus substitution affects the system.
Article
Physics, Fluids & Plasmas
Jean-Christian Angles d'Auriac, Ferenc Igloi
Summary: Using combinatorial optimization techniques, this study examines the critical properties of the two- and three-dimensional Ising models under a homogeneous longitudinal field. The results show that the phase transition is mixed order in two dimensions and it is uncertain whether it is second order or mixed order in three dimensions.
Article
Materials Science, Multidisciplinary
Chunxiang Shi, Weijin Hu, Ji Li, Bing Li, Weijun Ren, Zhidong Zhang
Summary: The Dy2Cr2C3 carbide exhibits a remarkable magnetocaloric response, with advantages of a wide temperature range and minor magnetic hysteresis, making it a promising candidate refrigerant for use near liquid H2 temperatures.
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
(2022)
Article
Materials Science, Multidisciplinary
L. Bhaskaran, A. N. Ponomaryov, J. Wosnitza, N. Khan, A. A. Tsirlin, M. E. Zhitomirsky, S. A. Zvyagin
Summary: This study reports high-field electron spin resonance studies of two iridium hexahalide compounds, revealing different magnon modes and estimated exchange couplings and anisotropic Kitaev interactions in the magnetically ordered state. The nearest-neighbor Heisenberg coupling was identified as the leading interaction term with weak Kitaev anisotropy.
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
Lu Huang, Wen-Ti Guo, Jiefeng Ye, Rui-Qi Liu, Jian-Min Zhang
Summary: In this study, the electronic structure and topological properties of the antiferromagnetic topological insulator MnSb4Se7 under spin-orbit coupling were investigated using first-principle calculations. The results show that MnSb4Se7 is a non-trivial topological insulator. Applying strain can close the band gap and induce a topological phase transition from a non-trivial topological insulator to a trivial insulator. The system undergoes an insulator-metal phase transition with increasing strain.
Article
Materials Science, Multidisciplinary
D. M. Pajerowski, J. S. Helton, V. O. Garlea, Y. Tomioka, Y. Tokura
Summary: This paper investigates the characteristics of low-energy magnetic excitations in the manganese oxide material La0.7Ca0.3MnO3. The results show that at 300K, the magnetic excitations consist of a diffusive ferromagnetic component at the Brillouin zone center and a quasielastic excitation at the Brillouin zone edge, both of which exhibit weakened intensity at 215K.
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
(2022)
Article
Chemistry, Physical
Qi Shen, Ivan Batashev, Fengqi Zhang, Hamutu Ojiyed, Niels van Dijk, Ekkes Bruck
Summary: The impact of partial substitution of Bi for Sb on Mn2Sb1-xBix compounds was investigated, revealing that Bi content affects the antiferro-to-ferrimagnetic transition temperature, and the increase in lattice parameters due to Bi substitution explains the origin of the transition.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Materials Science, Multidisciplinary
Hualei Sun, Liang Qiu, Yifeng Han, Enkui Yi, Junlong Li, Mengwu Huo, Chaoxin Huang, Hui Liu, Manrong Li, Weiliang Wang, Dao-Xin Yao, Benjamin A. Frandsen, Bing Shen, Yusheng Hou, Meng Wang
Summary: Through high-pressure synchrotron X-ray diffraction, two structural transitions are observed in NiPSe3 as a function of pressure, with the antiferromagnetic moment directions changing and the honeycomb layers sliding relative to each other. An insulator-metal transition accompanied by the emergence of superconductivity occurs between the two structural transitions. Electronic structure calculations reveal that these transitions and superconductivity in NiPSe3 are related to the enhanced electronic hybridizations under pressure.
MATERIALS TODAY PHYSICS
(2023)
Article
Materials Science, Multidisciplinary
Johann Ostmeyer, Evan Berkowitz, Stefan Krieg, Timo A. Laehde, Thomas Luu, Carsten Urbach
Summary: In this study, a comprehensive analysis of the operators contributing to the structure factors and order parameters of the hexagonal Hubbard Model was conducted using the Hybrid Monte Carlo algorithm. The results improve the consistency of Monte Carlo determinations of critical exponents and provide insights into the semimetal-Mott insulator transition in the hexagonal Hubbard Model. The methods employed are applicable to a wide range of lattice theories involving strongly correlated electrons.
Article
Physics, Multidisciplinary
Bidesh Biswas, Sourav Rudra, Rahul Singh Rawat, Nidhi Pandey, Shashidhara Acharya, Anjana Joseph, Ashalatha Indiradevi Kamalasanan Pillai, Manisha Bansal, Muireann de h-Ora, Debendra Prasad Panda, Arka Bikash Dey, Florian Bertram, Chandrabhas Narayana, Judith MacManus-Driscoll, Tuhin Maity, Magnus Garbrecht, Bivas Saha
Summary: In this study, we demonstrated the existence of a magnetic stress-driven metal-insulator transition in Chromium Nitride. Through structural, magnetic, and electronic transport characterization, as well as first-principles modeling analysis, we found that the phase transition temperature in CrN is directly proportional to the strain-controlled anisotropic magnetic stress. Compressive strain increases the magnetic stress, leading to a room-temperature transition. In contrast, tensile strain and the inclusion of nonmagnetic cations weaken the magnetic stress and reduce the transition temperature. This discovery unifies spin, charge, and lattice degrees of freedom in correlated materials and holds potential for novel device functionalities.
PHYSICAL REVIEW LETTERS
(2023)
Article
Physics, Multidisciplinary
Norbert H. H. Freitag, Christopher F. F. Reiche, Volker Neu, Parul Devi, Ulrich Burkhardt, Claudia Felser, Daniel Wolf, Axel Lubk, Bernd Buechner, Thomas Muehl
Summary: This article presents a quantitative magnetic force microscopy technique that can simultaneously map one magnetic stray-field component and its spatial derivative. It is applied to investigate circular magnetic nano-domains in MnNiGa bulk samples, providing bubble diameters and spatial extent in depth. The experimental results indicate that the magnetic bubbles have a significant spatial extent in depth and a buried bubble top base.
COMMUNICATIONS PHYSICS
(2023)
Article
Chemistry, Multidisciplinary
Hyeuk Jin Han, Sushant Kumar, Gangtae Jin, Xiaoyang Ji, James L. Hart, David J. Hynek, Quynh P. Sam, Vicky Hasse, Claudia Felser, David G. Cahill, Ravishankar Sundararaman, Judy J. Cha
Summary: The increasing resistance of copper (Cu) interconnects in integrated circuits is a major challenge for downscaling beyond 7 nm technology. Topological semimetals like molybdenum phosphide (MoP) nanowires show unprecedented resistivity scaling, superior to nanoscale Cu interconnects. MoP has better stability against electromigration and resistance to surface oxidation compared to Cu, making it an attractive alternative for the scaling challenge of Cu interconnects.
ADVANCED MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Guowei Li, Qun Yang, Kaustuv Manna, Yudi Zhang, Patrick Merz, Chandra Shekhar, Yang Zhang, Hua Lv, Anastasios Markou, Yan Sun, Claudia Felser
Summary: The study focuses on the enantiomeric processes in inorganic crystals, aiming to understand how homochirality develops in nature and chemical reactions. By growing B20 group PdGa single crystals with different chiral lattices, enantioselective recognition of 3,4-dihydroxyphenylalanine (DOPA) is achieved based on the orbital angular momentum (OAM) polarization. Results indicate that the adsorption energies of PdGa crystals and DOPA molecules differ depending on the pairing of O-2p orbital of DOPA with Pd-4d orbital of PdGa, providing a possible explanation for the emergence of chirality in nature.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2023)
Article
Physics, Applied
S. Shrestha, C. S. Chang, S. Lee, N. L. Kothalawala, D. Y. Kim, M. Minola, J. Kim, A. Seo
Summary: Graphene layers placed on SrTiO3 single-crystal substrates were investigated using temperature-dependent confocal Raman spectroscopy. This approach successfully resolved distinct Raman modes of graphene that are often difficult to trace in conventional measurements. Information on defects and strain states was obtained for graphene/SrTiO3 samples synthesized by different techniques. This confocal Raman spectroscopy can be applied not only to the graphene/SrTiO3 system but also to various two-dimensional layered materials with interfering Raman modes.
JOURNAL OF APPLIED PHYSICS
(2023)
Article
Multidisciplinary Sciences
A. S. Disa, J. Curtis, M. Fechner, A. Liu, A. von Hoegen, M. Foerst, T. F. Nova, P. Narang, A. Maljuk, A. V. Boris, B. Keimer, A. Cavalleri
Summary: Lattice manipulation through optical methods can enhance and stabilize high-temperature ferromagnetism, expanding the potential applications of YTiO3.
Article
Multidisciplinary Sciences
Hao Chu, Sergey Kovalev, Zi Xiao Wang, Lukas Schwarz, Tao Dong, Liwen Feng, Rafael Haenel, Min-Jae Kim, Parmida Shabestari, Le Phuong Hoang, Kedar Honasoge, Robert David Dawson, Daniel Putzky, Gideok Kim, Matteo Puviani, Min Chen, Nilesh Awari, Alexey N. Ponomaryov, Igor Ilyakov, Martin Bluschke, Fabio Boschini, Marta Zonno, Sergey Zhdanovich, Mengxing Na, Georg Christiani, Gennady Logvenov, David J. Jones, Andrea Damascelli, Matteo Minola, Bernhard Keimer, Dirk Manske, Nanlin Wang, Jan-Christoph Deinert, Stefan Kaiser
Summary: The authors observe a Fano resonance in the nonlinear THz response of La2-xSrxCuO4, which may arise from a coupling between superconducting and charge-density-wave amplitude fluctuations.
NATURE COMMUNICATIONS
(2023)
Article
Materials Science, Multidisciplinary
Hua Lv, Edouard Lesne, Rebeca Ibarra, Yan Sun, Anastasios Markou, Claudia Felser
Summary: In this study, the structural, magnetic, and electrical magnetotransport properties of 24 and 51 nm thick B20-RhSi thin films grown by magnetron sputtering were investigated. The films exhibited a nonmagnetic ground state and metallic behavior. It was confirmed that the temperature-dependent electrical resistivity is governed by electron-phonon scattering. The ability to grow textured-epitaxial thin films of nonmagnetic B20 chiral topological semimetals is an important step toward designing chiraltronic devices with novel functionalities.
PHYSICAL REVIEW MATERIALS
(2023)
Article
Engineering, Electrical & Electronic
Luca Tomarchio, Sen Mou, Lorenzo Mosesso, Anastasios Markou, Edouard Lesne, Claudia Felser, Stefano Lupi
Summary: In this paper, we investigate the terahertz emission from thin films of the magnetic topological nodal semimetal Co2MnGa when excited by femtosecond optical pulses. We identify multiple THz generation mechanisms, including a photon-drag effect induced by radiation pressure and a photovoltaic effect from the topological surface states of CMG. This interplay between generation mechanisms highlights the potential of Co2MnGa topological nodal semimetals for THz emitter devices.
ACS APPLIED ELECTRONIC MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Andrew M. Ochs, Gerhard H. Fecher, Bin He, Walter Schnelle, Claudia Felser, Joseph P. Heremans, Joshua E. Goldberger
Summary: KMgBi is a quantum material that exhibits axis-dependent conduction polarity and a greatly enhanced ordinary Nernst effect (ONE). It shows a significant zero-field transverse thermoelectric response and a new type of Nernst effect.
ADVANCED MATERIALS
(2023)
Article
Physics, Multidisciplinary
Sven Erik Ilse, Gisela Schuetz, Eberhard Goering
Summary: Magnetic multilayers with a separating insulating layer are widely used in functional devices. By using element selective x-ray resonant magnetic reflectometry, changes in the electronic structure of interfacial atoms caused by an electric field can be observed. The study shows that an electric field can slightly shift the energy of Ni L3-edge in a Ni/SiO2 interface, indicating a change in the oxidation state of interfacial Ni atoms. Further analysis reveals that only about 30% of the electrons moved by the electric field end up in interfacial Ni states.
PHYSICAL REVIEW LETTERS
(2023)
Review
Nanoscience & Nanotechnology
Georgios Varnavides, Amir Yacoby, Claudia Felser, Prineha Narang
Summary: As high-quality single-crystal materials used in electronic devices reach smaller scales, charge-transport phenomena lead to inhomogeneous spatial signatures with significant effects on material properties. These signatures, including spatially varying dissipation and interface resistance, are crucial for device control. This Review examines the inhomogeneous charge flow signatures in conductors, focusing on electron hydrodynamics, where electrons exhibit strong interactions and flow collectively like fluids. Recent experimental advances and theoretical frameworks are discussed, along with new charge-transport phenomena introduced by crystal symmetry in materials.
NATURE REVIEWS MATERIALS
(2023)
Review
Materials Science, Multidisciplinary
A. Ribak, M. Buzzi, R. Singla, S. Nakata, B. Keimer, A. Cavalleri
Summary: By exciting certain phonon modes in YBa2Cu3O6+x, superconducting-like interlayer coherence can be induced at temperatures higher than Tc. Recent research has linked these phenomena to a parametric excitation and amplification of Josephson plasma polaritons, which are overdamped but made coherent by the phonon drive. However, the dissipative response of uncondensed quasiparticles, which do not couple in the same way to the phonon drive, has not been studied. In this study, we investigate the enhancement of superfluid density and the dissipative response of quasiparticles by systematically tuning the duration and energy of the mid-infrared pulse, while keeping the peak field fixed. We find that the photoinduced superfluid density saturates to the equilibrium value for pulses longer than the phonon dephasing time, while the dissipative component continues to grow with increasing pulse duration. We show that superfluid and dissipation remain uncoupled as long as the drive is on, and identify an optimal regime of pump pulse durations for maximum superconducting response and minimized dissipation.
Article
Materials Science, Multidisciplinary
Lun-Hui Hu, Chunyu Guo, Yan Sun, Claudia Felser, Luis Elcoro, Philip J. W. Moll, Chao-Xing Liu, Andrei Bernevig
Summary: In this study, a hierarchical structure of quasisymmetries and their corresponding nodal structures in the chiral crystal material CoSi are revealed through two different approaches of perturbation expansions. Quasisymmetries are found to play a crucial role in the physical responses of the system and can protect the existence of nodal planes.
Article
Materials Science, Multidisciplinary
Eleanor F. Scott, Katherine A. Schlaak, Poulomi Chakraborty, Chenguang Fu, Satya N. Guin, Safa Khodabakhsh, Ashley E. Paz Y. Puente, Claudia Felser, Brian Skinner, Sarah J. Watzman
Summary: In this study, it was discovered that polycrystalline NbP exhibits a large Nernst effect and a large magneto-Seebeck effect simultaneously, which is rarely observed in a single material at the same temperature. Through doping, the temperature dependence of these magnetothermoelectric effects can be altered, providing a potential tuning mechanism for device applications.
Article
Engineering, Electrical & Electronic
Ryotaro Okabe, Mingda Li, Yuma Iwasaki, Nicolas Regnault, Claudia Felser, Masafumi Shirai, Alexander Kovacs, Thomas Schrefl, Atsufumi Hirohata
Summary: This letter summarizes the recent development of using artificial intelligence and machine learning in the search for magnetic materials, and briefly introduces the approaches used in materials discovery. The authors also provide a flowchart to assist in selecting the appropriate methods for material search. The letter also covers the authors' recent research activities in magnetism and quantum materials.
IEEE MAGNETICS LETTERS
(2023)
