Title: Anomalous anisotropic compression behavior of superconducting CrAs under high pressure

Journal Article · · Proceedings of the National Academy of Sciences of the United States of America
 [1];  [2];  [1];  [3];  [1];  [4];  [2];  [5];  [6];  [1]
  1. Center for High Pressure Science and Technology Advanced Research, Shanghai (China)
  2. Chinese Academy of Sciences (CAS), Beijing (China)
  3. Harbin Inst. of Technology (China)
  4. Chinese Academy of Sciences, Shanghai (China)
  5. Chinese Academy of Sciences (CAS), Beijing (China); Collaborative Innovation Center of Quantum Matter, Beijing (China)
  6. Center for High Pressure Science and Technology Advanced Research, Shanghai (China); Jilin Univ., Changchun (China)
+ Show Author Affiliations

CrAs was observed to possess the bulk superconductivity under high-pressure conditions. To understand the superconducting mechanism and explore the correlation between the structure and superconductivity, the high-pressure structural evolution of CrAs was investigated using the angle-dispersive X-ray diffraction (XRD) method. The structure of CrAs remains stable up to 1.8 GPa, whereas the lattice parameters exhibit anomalous compression behaviors. With increasing pressure, the lattice parameters a and c both demonstrate a nonmonotonic change, and the lattice parameter b undergoes a rapid contraction at ~0.18–0.35 GPa, which suggests that a pressure-induced isostructural phase transition occurs in CrAs. Above the phase transition pressure, the axial compressibilities of CrAs present remarkable anisotropy. A schematic band model was used to address the anomalous compression behavior of CrAs. Lastly, the present results shed light on the structural and related electronic responses to high pressure, which play a key role toward understanding the superconductivity of CrAs.

Research Organization:
Brookhaven National Laboratory (BNL), Upton, NY (United States)
Sponsoring Organization:
Chinese Academy of Sciences; Ministry of Science and Technology of China; National Science Associated Funding; Natural Science Foundation of China; USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
OSTI ID:
1354267
Report Number(s):
BNL-112783-2016-JA
Journal Information:
Proceedings of the National Academy of Sciences of the United States of America, Journal Name: Proceedings of the National Academy of Sciences of the United States of America Journal Issue: 48 Vol. 112; ISSN 0027-8424
Publisher:
National Academy of SciencesCopyright Statement
Country of Publication:
United States
Language:
English

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Quasilinear quantum magnetoresistance in pressure-induced nonsymmorphic superconductor chromium arsenide journal June 2017
Anomalous compression behaviour in Nd 2 O 3 studied by x-ray diffraction and Raman spectroscopy journal February 2018
Metal-insulator transition and magnetic fluctuations in polycrystalline Ru 1 − x Rh x P investigated by P 31 NMR journal April 2017

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75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
CrAs
anisotropic compression behavior
high pressure
phase transformation