Volume 132, Number 4, November 2020
|Number of page(s)||6|
|Section||Condensed Matter: Structural, Mechanical and Thermal Properties|
|Published online||28 December 2020|
First-order transition in trigonal structure CaMn2P2
1 Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences Beijing 100190, China
2 School of Physical Sciences, University of Chinese Academy of Sciences - Beijing 100190, China
3 School of Physical Science and Technology, ShanghaiTech University - Shanghai 201210, China
4 Department of Physics and Beijing Key Laboratory of Opto- electronic Functional Materials & Micro-nano Devices, Renmin University of China - Beijing 100872, China
5 Songshan Lake Materials Laboratory - Dongguan, Guangdong 523808, China
6 School of Physical Science and Technology, Lanzhou University - Lanzhou 730000, China
7 Kavli Institute for Theoretical Sciences - Beijing 100190, China
Received: 24 August 2020
Accepted: 28 October 2020
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.
PACS: 61.50.Ks – Crystallographic aspects of phase transformations; pressure effects / 72.20.-i – Conductivity phenomena in semiconductors and insulators / 74.10.+v – Occurrence, potential candidates
© 2020 EPLA
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