Angle dependence of H_{c2} with a crossover between the orbital and paramagnetic limits

A pair-breaking mechanism of a superconductor under magnetic fields, namely, the origin of the upper critical field H_{c2}, can be categorized into the orbital effect and the paramagnetic effect, which have been separately discussed so far because the physical pictures are totally different. Here we...

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Bibliographic Details
Published in:Physical review research 2020-03, Vol.2 (1), p.012064
Main Authors: Hideki Matsuoka, Masaki Nakano, Takashi Shitaokoshi, Takumi Ouchi, Yue Wang, Yuta Kashiwabara, Satoshi Yoshida, Kyoko Ishizaka, Masashi Kawasaki, Yoshimitsu Kohama, Tsutomu Nojima, Yoshihiro Iwasa
Format: Article
Language:English
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Summary:A pair-breaking mechanism of a superconductor under magnetic fields, namely, the origin of the upper critical field H_{c2}, can be categorized into the orbital effect and the paramagnetic effect, which have been separately discussed so far because the physical pictures are totally different. Here we propose a model that unifies these two origins into one formalism with a generalized physical picture. The obtained formula well describes the experimental results on the angle dependence of H_{c2} in a recently developed noncentrosymmetric superconductor, two-dimensional (2D) NbSe_{2}, providing essential information on the spin states of Cooper pairs in 2D NbSe_{2}. The proposed model is widely applicable to all superconductors, offering a powerful approach for comprehensive understanding of the origin of H_{c2}.
ISSN:2643-1564
DOI:10.1103/PhysRevResearch.2.012064