Upper critical field in the electron-doped layered superconductor ZrNCl0.7: Magnetoresistance studies
H. Tou, Y. J. Tanaka, M. Sera, Y. Taguchi, T. Sasaki, Y. Iwasa, L. Zhu, S. Yamanaka
DOI 10.1103/PhysRevB.72.020501 · Physical Review B
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Abstract
We report magnetoresistance measurements of layered superconductor ZrNCl0.7 at high magnetic fields (H) as high as 27T and temperatures (T) as low as 0.5K. The T dependence of the upper critical field Hc2(T) for H‖c and H⊥c was obtained. Hc2(T) starts to increase with a gentle slope near Tc(0) followed by a steep slope with decreasing T, implying the dimensional crossover of the interplane coherence length from three dimensional to two dimensional (2D). The Hc2(T) is found to be anisotropic for the field direction, where the slope of Hc2′=(dHc2∕dT) near H≈1T can be estimated as Hc2′⊥≈−22.1kOe∕K and Hc2′‖≈−4.9kOe∕K for H‖c and H⊥c, respectively. The obtained anisotropy parameter γ≈4.5 gives evidence for the 2D characteristic of the superconducting state in ZrNCl0.7.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| ZrNCl0.7 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 12.8 | Pressure not reported | unknown |
| Li0.48(THF)yHfNCl Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 25.5 | Pressure not reported | unknown |
| Li0.17ZrNCl Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 13 | Pressure not reported | unknown |
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