Temperature dependence of La spin-lattice relaxation time in the high-Tc superconductor La1.85Sr0.15CuO4
P. Butaud, P. Ségransan, C. Berthier, Y. Berthier, C. Paulsen, J. L. Tholence, P. Lejay
DOI 10.1103/PhysRevB.36.5702 · Physical Review B
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Abstract
We present NMR spin-lattice relaxation measurements of La, obtained at 32.9 MHz in the compound La1.85Sr0.15CuO4 over the temperature range 12-300 K. Although conductivity and acsusceptibility measurements on a piece of the same pellet indicate an onset of the superconducting transition at 37 and 32 K, respectively, an anomaly in the spin-lattice relaxation rate is observed around T=52 K, which can be attributed either to a weak structural phase transition or to precursory magnetic fluctuations. Below the superconducting transition down to 12 K, T1 stays constant and equal to 530±10 ms.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| La1.85Sr0.15CuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 37 | Pressure not reported | onset |
| La1.85Sr0.15CuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 32 | Pressure not reported | onset |
| La1.85Sr0.15CuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 32 | Pressure not reported | midpoint |
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