Distinctive Doping Dependence of Upper Critical Field in Iron-Based Superconductor LaFeAsO\(_{1-x}\)H\(_{x}\)

High magnetic fields up to 105 T have been utilized in deriving the upper critical field \(B_{\rm c2}\) of LaFeAsO\(_{1-x}\)H\(_x\) throughout whole temperatures below \(T_{\rm c}\). Resistivity measurements demonstrate that \(B_{\rm c2}\) behaves differently in samples with \(x = 0.12\) (SC1) from...

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Bibliographic Details
Published in:arXiv.org 2023-08
Main Authors: Kawachi, Shiro, Yamaura, Jun-ichi, Kuramoto, Yoshio, Iimura, Soshi, Nomura, Toshihiro, Kohama, Yoshimitsu, Sasaki, Takashi, Tokunaga, Masashi, Murakami, Youichi, Hosono, Hideo
Format: Article
Language:English
Subjects:
Coupling
Critical field (superconductivity)
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Summary:High magnetic fields up to 105 T have been utilized in deriving the upper critical field \(B_{\rm c2}\) of LaFeAsO\(_{1-x}\)H\(_x\) throughout whole temperatures below \(T_{\rm c}\). Resistivity measurements demonstrate that \(B_{\rm c2}\) behaves differently in samples with \(x = 0.12\) (SC1) from those with 0.32 (SC2). In SC1, the two-band model assuming the \(s\)-wave pairing gives a good fitting with repulsive intraband interaction and dominant interband coupling. In SC2, we have to assume attractive intraband interaction with weak interband coupling, which in fact suggests a non-\(s\)-wave pairing in view of the strong Coulomb repulsion. These results support the possibility that SC1 and SC2 have different pairing symmetries.
ISSN:2331-8422