2020/11/01 by Y. J. Li, Yulin Li, F. Jin +26
Chemistry · Materials Science · Physics and Astronomy · #Chemistry #Condensed matter physics #Crystal structure #Crystallography #Electrical resistivity and conductivity #Iron-based superconductors research #Magnetic field #Magnetization #Materials science #Order (exchange) #Phase transition #Physics #Raman spectroscopy #Rare-earth and actinide compounds #Semiconductor materials and interfaces #Trigonal crystal system #cond-mat.mtrl-sci
paper · pdf · doi:10.1209/0295-5075/132/46001
published as EPL 132 (2020) 46001 · 6 pages, 6 figures. Accepted by Europhysics Letters
openalex publication_date 2020/11/01 · arxiv created 2020/12/03 · openalex created_date 2021/01/05 · arxiv updated 2021/01/08 · openalex updated_date 2026/08/05
Abstract We report structural and physical properties of the single crystalline . The X-ray diffraction (XRD) results show that adopts the trigonal -type structure. Temperature-dependent electrical resistivity measurements indicate an insulating ground state for with activation energies of 40 meV and 0.64 meV for two distinct regions, respectively. Magnetization measurements show no apparent magnetic phase transition under 400 K. Different from other , Sr, and Ba, and , As, and Sb) compounds with the same structure, heat capacity and reveal that has a first-order transition at and the transition temperature shifts to high temperature upon increasing pressure. The emergence of plenty of new Raman modes below the transition, clearly suggests a change in symmetry accompanying the transition. The combination of the structural, transport, thermal and magnetic measurements points to an unusual origin of the transition.