Fermi-liquid behavior and weakly anisotropic superconductivity in the electron-doped cuprate Sr1−xLaxCuO2
Kohki H. Satoh, Soshi Takeshita, Akihiro Koda, Ryosuke Kadono, Kenji Ishida, Sunsen Pyon, Takao Sasagawa, Hidenori Takagi
DOI 10.1103/PhysRevB.77.224503 · Physical Review B
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Abstract
The microscopic details of flux-line lattice state studied by muon spin rotation are reported in an electron-doped high-Tc cuprate superconductor, Sr1−xLaxCuO2 (SLCO) (x=0.10–0.15). A clear sign of phase separation between magnetic and nonmagnetic phases is observed, where the effective magnetic penetration depth [λ≡λ(T,H)] is determined selectively for the latter phase. The extremely small value of λ(0,0) and corresponding large superfluid density (ns∝λ−2) is consistent with the presence of a large Fermi surface with carrier density of 1+x, which suggests the breakdown of the “doped Mott insulator” even at the “optimal doping” in SLCO. Moreover, a relatively weak anisotropy in the superconducting order parameter is suggested by the field dependence of λ(0,H). These observations strongly suggest that the superconductivity in SLCO is of a different class from hole-doped cuprates.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Sr1-xLaxCuO2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 42 | Pressure not reported | onset |
| Sr1-xLaxCuO2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 40 | Pressure not reported | unknown |
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