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Emerging Superconductivity and the Origin of Its Enhancement in Pressurized Topological Nodal‐Line Semimetal SrAs 3
Author(s) -
Qi Mengyao,
Zhu Xiangde,
Zhou Yonghui,
An Chao,
Chen Chunhua,
Yuan Yifang,
Zhang Bowen,
Wang Shuyang,
Zhou Ying,
Chen Xuliang,
Zhang Ranran,
Tian Mingliang,
Yang Zhaorong
Publication year - 2020
Publication title -
advanced electronic materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.25
H-Index - 56
ISSN - 2199-160X
DOI - 10.1002/aelm.202000293
Subject(s) - superconductivity , condensed matter physics , semimetal , fermi level , raman spectroscopy , topology (electrical circuits) , synchrotron , materials science , phase (matter) , physics , phase transition , band gap , electron , quantum mechanics , mathematics , combinatorics
Topological nodal‐line semimetal SrAs 3 hosts a simple nodal loop on the verge of Fermi level without distracting trivial states, providing a good platform for further investigations of electronic quantum states. Here, a report on pressure‐driven superconductivity in SrAs 3 single crystal is provided and the interplay between the crystal structure, electronic state, and superconductivity is clarified therein. The comprehensive high‐pressure experiments, i.e., synchrotron X‐ray diffraction, electrical transport, and Raman spectroscopy, consistently reveal a critical pressure P c ≈ 25 GPa. Around P c , a superconducting transition appears, concomitant with the formation of high‐pressure cubic Pm ‐3 m phase. Meanwhile, the superconducting transition temperature T c and hole carrier density increase synchronously above P c . This finding demonstrates that the emerging superconductivity in SrAs 3 stems from the high‐pressure cubic phase on the one hand, and shows that the evolution of T c ( P ) is intimately correlated with the enhanced density of states near the Fermi level on the other hand.