Low anisotropy of the upper critical field in a strongly anisotropic layered cuprate Bi2.15Sr1.9CuO6+δ: Evidence for a paramagnetically limited superconductivity
S. O. Katterwe, Th. Jacobs, A. Maljuk, V. M. Krasnov
DOI 10.1103/PhysRevB.89.214516 · Physical Review B
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Abstract
We study angular-dependent magnetoresistance in a low-Tc layered cuprate Bi2.15Sr1.9CuO6+δ. The low Tc∼4 K allows complete suppression of superconductivity by modest magnetic fields and facilitates accurate analysis of the upper critical field Hc2. We observe a universal exponential decay of fluctuation conductivity in a broad range of temperatures above Tc and propose a method for extraction of Hc2(T) from the scaling analysis of the fluctuation conductivity at T>Tc. Our main result is observation of a surprisingly low Hc2 anisotropy ∼2, which is much smaller than the effective mass anisotropy of the material ∼300. We show that the anisotropy is decreasing with increasing field and saturates at a small value when the field reaches the paramagnetic limit. We argue that the dramatic discrepancy of high-field and low-field anisotropies is clear evidence for paramagnetically limited superconductivity.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Bi2.15Sr1.9CuO6+δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 4 | Pressure not reported | unknown |
| Bi2.15Sr1.9CuO6+δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 4.3 | Pressure not reported | unknown |
| Bi2.15Sr1.9CuO6+δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 3.5 | Pressure not reported | unknown |
| Bi2Sr2Ca2Cu3O10+δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 110 | Pressure not reported | unknown |
| Bi2Sr2CaCu2O8+δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 95 | Pressure not reported | unknown |
| Bi2Sr2CuO6+δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 30 | Pressure not reported | unknown |
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