Weakly Coupled Type-II Superconductivity in a Laves compound ZrRe2

We present a comprehensive investigation of the superconducting properties of ZrRe2, a Re-based hexagonal Laves compounds. ZrRe2 crystallizes in a C14-type structure (space group P63/mmc), with cell parameters a=b=5.2682(5) and c=8.63045 . Resistivity and magnetic susceptibility data both suggest th...

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Bibliographic Details
Published in:arXiv.org 2024-07
Main Authors: Yu, Yingpeng, Liu, Zhaolong, Li, Qi, Chen, Zhaoxu, Wang, Yulong, Munan Hao, Yang, Yaling, Gong, Chunsheng, Long, Chen, Xie, Zhenkai, Zhou, Kaiyao, Ren, Huifen, Chen, Xu, Jin, Shifeng
Format: Article
Language:English
Subjects:
Critical field (superconductivity)
Magnetic permeability
Phonons
Specific heat
Superconductivity
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Summary:We present a comprehensive investigation of the superconducting properties of ZrRe2, a Re-based hexagonal Laves compounds. ZrRe2 crystallizes in a C14-type structure (space group P63/mmc), with cell parameters a=b=5.2682(5) and c=8.63045 . Resistivity and magnetic susceptibility data both suggest that ZrRe2 exhibits a sharp superconducting transition above 6.1 K. The measured lower and upper critical fields are 6.27 mT and 12.77 T, respectively, with a large upper critical field that approached the Pauli limit.Measurements of the heat capacity confirm the presence of bulk superconductivity, with a normalized specific heat change of 1.24 and an electron-phonon strength of 0.69 . DFT calculations revealed that the band structure of ZrRe2 is intricate and without van-Hove singularity. The observed large specific heat jump, combined with the electron-phonon strength , suggests that ZrRe2 is a weakly coupled type II superconductor.
ISSN:2331-8422