Multiband superconductivity in LaFeAsO0.9F0.1 single crystals probed by high-field vortex torque magnetometry
G. Li, G. Grissonnanche, A. Gurevich, N. D. Zhigadlo, S. Katrych, Z. Bukowski, J. Karpinski, L. Balicas
DOI 10.1103/PhysRevB.83.214505 · Physical Review B
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Abstract
To probe manifestations of multiband superconductivity in oxypnictides, we measured the angular dependence of the magnetic torque τ(θ) in the mixed state of LaO0.9F0.1FeAs single crystals as a function of temperature T and magnetic fields H up to 18 T. The paramagnetic contribution of the Fe ions is properly treated in order to extract the effective mass anisotropy parameter γ=(mc/mab)1/2 from τ(θ). We show that γ depends strongly on both T and H, reaching a maximum value of ~10 followed by a decrease toward values close to 1 as T is lowered. The observed field dependencies of the London penetration depth λab and γ suggest the onset of suppression of a superconducing gap at H≈Hc2/3.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| LaFeAsO0.9F0.1 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 15 | Pressure not reported | onset |
| LaO0.9F0.1FeAs Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 15 | Pressure not reported | onset |
| NdFeAsO0.8F0.2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
| SmFeAsO0.8F0.2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 44 | Pressure not reported | unknown |
| PrFeAsO1-y Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 35 | Pressure not reported | unknown |
| LaFePO Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
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