Abstract:
: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. 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.
journal_name
Proc Natl Acad Sci U S Aauthors
Yu Z,Wu W,Hu Q,Zhao J,Li C,Yang K,Cheng J,Luo J,Wang L,Mao HKdoi
10.1073/pnas.1520570112subject
Has Abstractpub_date
2015-12-01 00:00:00pages
14766-70issue
48eissn
0027-8424issn
1091-6490pii
1520570112journal_volume
112pub_type
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