Concurrence of superconductivity and structure transition in Weyl semimetal TaP under pressure View Full Text


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Article Info

DATE

2017-12-01

AUTHORS

Yufeng Li, Yonghui Zhou, Zhaopeng Guo, Fei Han, Xuliang Chen, Pengchao Lu, Xuefei Wang, Chao An, Ying Zhou, Jie Xing, Guan Du, Xiyu Zhu, Huan Yang, Jian Sun, Zhaorong Yang, Wenge Yang, Ho-Kwang Mao, Yuheng Zhang, Hai-Hu Wen

ABSTRACT

Weyl semimetal defines a material with three-dimensional Dirac cones, which appear in pair due to the breaking of spatial inversion or time reversal symmetry. Superconductivity is the state of quantum condensation of paired electrons. Turning a Weyl semimetal into superconducting state is very important in having some unprecedented discoveries. In this work, by doing resistive measurements on a recently recognized Weyl semimetal TaP under pressures up to about 100 GPa, we show the concurrence of superconductivity and a structure transition at about 70 GPa. It is found that the superconductivity becomes more pronounced when decreasing pressure and retains when the pressure is completely released. High-pressure x-ray diffraction measurements also confirm the structure phase transition from I41md to P-6m2 at about 70 GPa. More importantly, ab-initial calculations reveal that the P-6m2 phase is a new Weyl semimetal phase and has only one set of Weyl points at the same energy level. Our discovery of superconductivity in TaP by high pressure will stimulate investigations on superconductivity and Majorana fermions in Weyl semimetals. More... »

PAGES

66

Identifiers

URI

http://scigraph.springernature.com/pub.10.1038/s41535-017-0066-z

DOI

http://dx.doi.org/10.1038/s41535-017-0066-z

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https://app.dimensions.ai/details/publication/pub.1092580971


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