Distinctive doping dependence of upper critical field in iron-based superconductor LaFeAsO1−xHx
Shiro Kawachi, Jun-ichi Yamaura, Yoshio Kuramoto, Soshi Iimura, Toshihiro Nomura, Yoshimitsu Kohama, Takashi Sasaki, Masashi Tokunaga, Youichi Murakami, Hideo Hosono
DOI 10.1103/PhysRevB.108.L100503 · Physical Review B
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Abstract
High magnetic fields up to 105 T have been utilized in deriving the upper critical field Bc2 of LaFeAsO1−xHx throughout the wide temperature range below Tc. Resistivity measurements demonstrate that Bc2 behaves differently in samples with x=0.12 (SC1) from those with 0.32 (SC2). In SC1, the two-band model assuming s-wave pairing gives a good fitting with a repulsive intraband interaction and dominant interband coupling. In SC2, we have to assume an 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.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| LaFeAsO1-xHx Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 20.4 | Pressure not reported | unknown |
| LaFeAsO1-xHx Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 29.4 | Pressure not reported | unknown |
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