Article
Chemistry, Applied
Yingsui Jiang, Hui Shen, Jiayue Xu, Jian Ma, Haoyu Wang, Baoliang Lu
Summary: This study successfully grew high-quality YIG and Bi:TIG single crystals for the first time using the flux-Bridgman method, showing potential for solving the challenge of growing large size RIG crystals. YIG and TIG crystals demonstrated good transmittance and specific Faraday rotations in certain wavelength ranges.
JOURNAL OF RARE EARTHS
(2021)
Article
Materials Science, Multidisciplinary
Min Jin, Wen-Hui Yang, Xiang-Hu Wang, Rong-Bin Li, Ya-Dong Xu, Jia-Yue Xu
Summary: ZnTe single crystal prepared by the vertical Bridgman method using Te as flux shows good feasibility for THz applications, with a high transmittance and a band gap of 2.225 eV.
Article
Chemistry, Inorganic & Nuclear
Xiang Zheng, Jie Qi, Yihao Zheng, Chengjun Liu
Summary: High-purity CeAlO3 product was synthesized through the solid-state method with low oxygen partial pressure and excess carbon. The morphology and structure of the product were investigated using various techniques. The synthesized CeAlO3 product exhibited green color and belonged to the P4/mmm space group. Raman spectroscopy indicated the presence of three active modes at approximately 156 cm-1, 173 cm-1, and 496 cm-1. CeAlO3 nucleated at the contact surface between formed Ce2O3 and Al2O3, with further promotion of formation and compositional homogeneity through lattice diffusion.
JOURNAL OF SOLID STATE CHEMISTRY
(2022)
Article
Materials Science, Multidisciplinary
K. Vlaskova, R. H. Colman, M. Klicpera
Summary: The solid-state reaction, hydrothermal synthesis, and CsCl flux methods were employed to prepare Er2Ir2O7 pyrochlore iridate, with the flux method providing the best conditions for single phase pyrochlore preparation. The purity of the sample reached 94% after repeated reaction with additional excess IrO2 oxide. A successful preparation route for heavy-rare earth pyrochlore iridates is established.
MATERIALS CHEMISTRY AND PHYSICS
(2021)
Article
Chemistry, Physical
Qingchen Duan, Shaohua Liu, Baizhuo Li, Jiaojiao Meng, Wuzhang Yang, Yuping Sun, Shenggui Fu, Qiang Jing, Shugang Tan, Dan Yu, Yuxue Mei, Zhi Ren, Cao Wang, Guanghan Cao
Summary: In this paper, the effects of iso-valent substitution of P/Sb for As in ThFePnN systems to modulate the chemical pressure were investigated. It was found that superconductivity in the P-doped ThFeAs1-xPxN system disappears at x = 0.3, while in the Sb-doped ThFeAs1-ySbyN samples, superconductivity is gradually suppressed at y = 0.25. The physical properties of ThFePnN samples significantly differ from those of LaFePnO, regardless of P or Sb doping.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Chemistry, Physical
Allison Wustrow, Guanglong Huang, Matthew J. McDermott, Daniel O'Nolan, Chia-Hao Liu, Gia Thinh Tran, Brennan C. McBride, Shyam S. Dwaraknath, Karena W. Chapman, Simon J. L. Billinge, Kristin A. Persson, Katsuyo Thornton, James R. Neilson
Summary: The study identified a cooperative effect in solid-state metathesis reactions that involves using alkaline earth metals instead of alkali metals to lower the formation temperature of orthorhombic YMnO3. Experiments showed that by reacting MgMn2O4 and CaMn2O4 with YOCl in a cooperative cometathesis reaction, reaction temperatures can be reduced to 550°C while maintaining phase selectivity. This approach also showed potential in synthesizing other metastable targets such as TbMnO3, ErMnO3, and DyMnO3 with reduced temperatures and preserved reaction selectivity.
CHEMISTRY OF MATERIALS
(2021)
Article
Chemistry, Multidisciplinary
Jianyu Xie, Xinyou Liu, Wei Zhang, Sum Ming Wong, Xuefeng Zhou, Yusheng Zhao, Shanmin Wang, Kwing To Lai, Swee K. Goh
Summary: Through a series of high-pressure experiments on FeSe thin flakes, it was found that the nematic phase boundary remains robust while the magnetic order is weakened as the thickness decreases. A local maximum of Tc is observed in all samples, but the maximum value is reduced as magnetism weakens.
Article
Physics, Applied
Hiroki Ninomiya, Kenji Kawashima, Shigeyuki Ishida, Hiraku Ogino, Hiroshi Fujihisa, Yoshito Gotoh, Yoshiyuki Yoshida, Akira Iyo, Hiroshi Eisaki
Summary: Ca-free Hg-based double-layered cuprates with Sr ions separating the two CuO2 planes exhibit bulk superconductivity at a critical temperature above 100 K. Introduction of Mo and Re atoms improves the critical current density and irreversibility field properties, possibly due to reduced thickness of the blocking layer. Replacement of Ca by Sr in the CuO2 planes does not significantly affect the temperature dependence of the irreversibility field.
SUPERCONDUCTOR SCIENCE & TECHNOLOGY
(2023)
Article
Materials Science, Ceramics
Zhen Wang, Wei Han, Jiang Zhang, Qinghua Fan, Yanming Zhao
Summary: YB6 nanowires were prepared using a high-pressure solid-state technique at low temperatures, exhibiting superconducting behavior with a transition temperature of 7.8 K. The nanowires belong to a type-II superconductor, as confirmed by the observation of peak effect in the magnetic hysteresis loops.
CERAMICS INTERNATIONAL
(2021)
Article
Materials Science, Ceramics
Nicole Bartek, Vladimir V. Shvartsman, Soma Salamon, Heiko Wende, Doru C. Lupascu
Summary: Lead iron niobate (PFN) is a multiferroic material with properties highly dependent on synthesis conditions. By optimizing calcination and sintering temperatures, ceramics with large polarization and dielectric permittivity can be obtained. Increasing temperatures also affects the ferroelectric phase transition and Ne ' el temperature due to a change in the distribution of Fe3+ and Nb5+ ions.
CERAMICS INTERNATIONAL
(2021)
Article
Physics, Applied
Himanshu Chauhan, Rohit Kumar, G. D. Varma
Summary: We report the anisotropy in the superconducting properties of FeTe0.55Se0.45 bulk single crystal synthesized using the self-flux method. Magnetotransport, magnetic, and heat capacity measurements were performed on single crystals of the same batch. The anisotropy in the upper critical field, coherence length, and critical current density was studied under applied magnetic fields along the ab-plane and c-axis. The presence of 'peak effect' was observed in M-H loops for H parallel to c only, indicating the shift of the effect towards lower fields with increasing temperature. The pinning mechanisms were determined using the Dew Hughes scaling rule.
SUPERCONDUCTOR SCIENCE & TECHNOLOGY
(2022)
Article
Chemistry, Multidisciplinary
Georg F. Dewald, Zainab Liaqat, Martin Alexander Lange, Wolfgang Tremel, Wolfgang G. Zeier
Summary: This study prepared FeS2 nanoparticles via a solvothermal method and evaluated their electrochemical performance in solid-state batteries, finding that smaller particle dimensions have a positive effect on FeS2 utilization. The results highlight the general importance of morphological design in realizing the promising theoretical capacity of conversion electrodes in solid-state batteries.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2021)
Article
Materials Science, Multidisciplinary
L. N. Sang, Z. Li, G. S. Yang, Z. J. Yue, J. X. Liu, C. B. Cai, T. Wu, S. X. Dou, Y. W. Ma, X. L. Wang
Summary: Research on iron-based superconductors has made significant progress in the past decade, covering various aspects including high-pressure studies, superconductivity properties, and vortex dynamics. These studies have deepened our understanding of the mechanisms behind superconductivity.
MATERIALS TODAY PHYSICS
(2021)
Article
Chemistry, Physical
Vinay Kaushik, V. Ganesan
Summary: A comprehensive study on a magnetic superconductor (Pr2Pt3Ge5) revealed its superconducting properties and lattice states under different field strengths. The superconductor showed signs of 2D behavior at low fields and transitioned to a Fermi liquid state at high fields.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Physics, Applied
J. E. Hirsch
Summary: This article points out that hysteresis in transport properties has never been reported for hydrides under pressure, and this phenomenon can determine whether they are superconductors.
JOURNAL OF SUPERCONDUCTIVITY AND NOVEL MAGNETISM
(2022)
Article
Physics, Condensed Matter
Liurukara D. Sanjeewa, Yaohua Liu, Jie Xing, Randy S. Fishman, Mudithangani T. K. Kolambage, Michael A. McGuire, Colin D. McMillen, Joseph W. Kolis, Athena S. Sefat
Summary: The synthesis, structure, and physical properties of Y5Ru2O12, a new member of the Ln(5)B(2)O(12) class, were reported. Single crystals of Y(5)Ru(2)O(12) were synthesized using a high-temperature, high-pressure hydrothermal method, exhibiting a complex 3D structure and antiferromagnetic behavior.
PHYSICA STATUS SOLIDI B-BASIC SOLID STATE PHYSICS
(2021)
Article
Chemistry, Multidisciplinary
Giang D. Nguyen, Mingming Fu, Qiang Zou, Liurukara D. Sanjeewa, An-Ping Li, Athena S. Sefat, Zheng Gai
Summary: The study reveals localized superconducting states in a calcium-iron-based superconductor using low-temperature scanning tunneling microscopy and spectroscopy. The competition between local strain of praseodymium dopants and defect-induced local magnetic moments affects the superconductivity. These superconducting states exist at the nanoscale near the praseodymium dopants and are not influenced by surface reconstruction or defects.
Article
Multidisciplinary Sciences
I. F. Llovo, C. Carballeira, D. Sonora, A. Pereiro, J. J. Ponte, S. Salem-Sugui Jr, A. S. Sefat, J. Mosqueira
Summary: Detailed measurements were performed on a high-quality Ba(Fe1-xCox)2As2 (x=0.065) single crystal, revealing a significant rounding of the resistivity above the superconducting critical temperature Tc due to Cooper pairs. The analysis indicates that the angular dependence of the upper critical field, Hc2(theta), deviates significantly from the single-band model, particularly for large angles.
SCIENTIFIC REPORTS
(2021)
Article
Materials Science, Multidisciplinary
T. Ferreira, S. Calder, D. S. Parker, M. H. Upton, A. S. Sefat, H-C zur Loye
Summary: The study provides a comprehensive investigation into the role of A-site cations on magnetic interactions in Ln(2)NiIrO(6) compounds, revealing different magnetic structures and transport properties in La2NiIrO6, Nd2NiIrO6, and Pr2NiIrO6. The presence of two independent magnetic sublattices is observed in each compound, showing unique magnetic behaviors. Theoretical calculations using density-functional theory shed light on the behavior of these compounds and the influence of A-site cations.
PHYSICAL REVIEW MATERIALS
(2021)
Article
Nanoscience & Nanotechnology
Jie Xing, Liurukara D. Sanjeewa, Andrew F. May, Athena S. Sefat
Summary: This study reports the single-crystal growth synthesis, crystal structure characterizations, and magnetic properties of AYbSe(2) (A = K and Rb) compounds, showing possible quantum spin liquid ground state. The magnetic properties exhibit high anisotropy, with a one-third magnetization plateau in the isothermal magnetization curve, and characteristic dome-shaped heat capacity behavior.
Article
Chemistry, Inorganic & Nuclear
Liurukara D. Sanjeewa, Jie Xing, Keith M. Taddei, Athena S. Sefat
Summary: We synthesized and characterized KLnSe(2) series via solid state molten flux growth method. The crystal structures were determined using single crystal x-ray diffraction, revealing a trigonal crystal system with two-dimensional layers made of edged shared LnSe(6)-octahedra. The magnetic properties indicate frustrated magnetism in the KLnSe(2) series, as Ce, Pr, and Nd do not exhibit long-range ordering below 0.4 K.
JOURNAL OF SOLID STATE CHEMISTRY
(2022)
Article
Physics, Multidisciplinary
K. M. Taddei, V. O. Garlea, A. M. Samarakoon, L. D. Sanjeewa, J. Xing, T. W. Heitmann, C. dela Cruz, A. S. Sefat, D. Parker
Summary: Researchers have identified a potential candidate material, KNiAsO4, that may exhibit a spin-liquid ground state based on the Kitaev spin Hamiltonian. Experimental measurements show evidence of magnetic order and a gapped spin-wave spectrum, suggesting the presence of a well-defined spin-liquid state.
PHYSICAL REVIEW RESEARCH
(2023)
Article
Chemistry, Multidisciplinary
Liurukara D. Sanjeewa, V. Ovidiu Garlea, Randy S. Fishman, Mahsa Foroughian, Li Yin, Jie Xing, David S. Parker, Tiffany Smith M. Pellizzeri, Athena S. Sefat, Joseph W. Kolis
Summary: In this study, the magnetic phase diagram of the compound CsCo2(MoO4)2(OH) was determined through magnetic and neutron scattering measurements. The magnetic properties of CsCo2(MoO4)2(OH) are strongly influenced by the crystal lattice and can be easily controlled by magnetic fields. The compound exhibits unique magnetic exchange interactions between two types of Co2+ ions. The magnetic structure is antiferromagnetic along the b-axis at TN = 5 K, with two successive metamagnetic transitions observed. The compound shows promising potential for studying new physics related to sawtooth chain magnetism. Rating: 6/10.
MATERIALS CHEMISTRY FRONTIERS
(2023)
Article
Chemistry, Inorganic & Nuclear
Liurukara D. Sanjeewa, V. Ovidiu Garlea, Keith M. Taddei, Li Yin, Jie Xing, Randy S. Fishman, David S. Parker, Athena S. Sefat
Summary: This article reports the synthesis and characterization of a new material, NaCo2(SeO3)(2)(OH), which has a highly frustrated sublattice of sawtooth Co2+ chains. The material shows both ferromagnetic and antiferromagnetic transitions at different temperatures, and neutron scattering measurements reveal the spin excitations in the material.
INORGANIC CHEMISTRY FRONTIERS
(2022)
Article
Materials Science, Multidisciplinary
David S. Parker, Li Yin, German D. Samolyuk, Liurukara D. Sanjeewa, Xiaoping Wang, Valentino R. Cooper, Yaohua Liu, Sergey Bud'ko, Athena S. Sefat
Summary: This study presents a detailed theoretical and experimental investigation of vanadium monotelluride VTe. The material exhibits a complex hierarchy of magnetic interactions and energy scales, with an antiferromagnetic ground state and insulating character. The research also explores the effects of off-stoichiometry on energetics and provides a structural explanation for the formation of defect structures in VTe and other NiAs-structure materials.
Article
Materials Science, Multidisciplinary
K. M. Taddei, L. Yin, L. D. Sanjeewa, Y. Li, J. Xing, C. dela Cruz, D. Phelan, A. S. Sefat, D. S. Parker
Summary: In this study, EuCd2As2 material was investigated using neutron diffraction, density-functional theory, and transport measurements. The results revealed a single pair of Weyl points in this material, along with a specific magnetic structure and canting angle. The study also demonstrated that the canting angle can tune the distance between the Weyl points and the Fermi level.
Article
Materials Science, Multidisciplinary
Yun-Yi Pai, Claire E. Marvinney, Liangbo Liang, Jie Xing, Allen Scheie, Alexander A. Puretzky, Gabor B. Halasz, Xun Li, Rinkle Juneja, Athena S. Sefat, David Parker, Lucas Lindsay, Benjamin J. Lawrie
Summary: In this study, Raman spectroscopy is used to identify phonon and crystal electric field (CEF) modes in CsYbSe2. Strong coupling between CEF and phonon modes is observed, leading to a vibronic bound state. The complex interaction between phonon modes and CEF modes is observed in real space. Additionally, an unexpected resonant Raman excitation condition is satisfied, resulting in multiple combination modes.
JOURNAL OF MATERIALS CHEMISTRY C
(2022)
Article
Physics, Multidisciplinary
Christopher A. Pocs, Peter E. Siegfried, Jie Xing, Athena S. Sefat, Michael Hermele, B. Normand, Minhyea Lee
Summary: The primary goal at the intersection of theoretical and experimental quantum magnetism is to investigate exotic spin states, particularly quantum spin liquids (QSLs). Rare-earth ions introduce competitive energy scales beyond the traditional paradigms of geometrical frustration, resulting in anisotropic effective spin models with intrinsic frustration. By using experimental techniques, the extraction of Stevens operators determining the full CEF spectrum of Yb3+ was successfully achieved, leading to crucial insights for interpreting anisotropic magnetic susceptibility measurements.
PHYSICAL REVIEW RESEARCH
(2021)
Article
Materials Science, Multidisciplinary
Jie Xing, Keith M. Taddei, Liurukara D. Sanjeewa, Randy S. Fishman, Marcus Daum, Martin Mourigal, C. dela Cruz, Athena S. Sefat
Summary: The rare-earth triangular lattice material KErSe2 exhibits magnetic transition at 0.2 K in zero applied field, with long-range order suppressed by a magnetic field. Neutron powder diffraction indicates a stripe spin structure in the ordered state, with Er having a reduced moment of 3.06(1)mu(B)/Er and persistent diffuse magnetic scattering potentially indicating magnetic fluctuations. Additionally, neutron diffraction under an applied field shows a metamagnetic transition to ferromagnetic order at around 0.5 T.
Article
Materials Science, Multidisciplinary
J. L. Niedziela, L. D. Sanjeewa, A. A. Podlesnyak, L. DeBeer-Schmitt, S. J. Kuhn, C. de la Cruz, D. S. Parker, K. Page, A. S. Sefat
Summary: The temperature-dependent investigation of FeAs binary revealed that the peak magnetic susceptibility temperature corresponds to the onset of anisotropic negative thermal expansion. Inelastic neutron scattering showed that spin waves in FeAs exhibit two-dimensional characteristics near the magnetic transition, highlighting the potential for unconventional superconductivity in a three-dimensional crystal structure with 2D excitations.
