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24 April 2024 |
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Article overview
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Superconductivity in topological nontrivial material Au2Pb | | Ying Xing
; He Wang
; Chaokai Li
; Xiao Zhang
; Jun Liu
; Yangwei Zhang
; Jiawei Luo
; Ziqiao Wang
; Yong Wang
; Langsheng Ling
; Mingliang Tian
; Shuang Jia
; Ji Feng
; Xiong-Jun Liu
; Jian Wei
; Jian Wang
; | | Date: |
3 Mar 2016 | | Abstract: | Recently, topological superconductor has attracted much attention and become
one of the most important topics in condensed matter physics and materials
science. However, topological superconductivity has not been completely
demonstrated in experiments although significant progress has been achieved. In
this article, we report systematic studies on Au2Pb single crystals. Bulk
superconductivity (onset transition temperature, Tconset= 1.3 K) of Au2Pb is
identified by both transport and diamagnetic measurements. Above
superconducting transition temperature Tc, an obvious longitudinal linear
magnetoresistance at 2.5 K up to 15 T is observed. Furthermore, by point
contact measurement, superconducting gap of Au2Pb is clearly revealed.
Interestingly, when the gold tip is replaced by tungsten tip, the concomitant
enhancement of Tconset and upper critical field (Hc2) are detected, which may
relate to the changes of the Fermi surfaces and density of states induced by
the tip pressure on Au2Pb. First-principles calculations demonstrate that the
Fermi surface of this material becomes enlarged with the application of
external pressure, and disclose peculiar phase winding of the orbital
pseudospin along k-space loops around the Fermi energy. The implications of
these findings on the possibility of topological superconductivity in Au2Pb
crystal are discussed. | | Source: | arXiv, 1603.1021 | | Services: | Forum | Review | PDF | Favorites | |
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