Al NMR Probe of Local Moments Induced by an Al Impurity in High- Tc Cuprate La1.85Sr0.15CuO4
K. Ishida, Y. Kitaoka, K. Yamazoe, K. Asayama, Y. Yamada
DOI 10.1103/PhysRevLett.76.531 · Physical Review Letters
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Abstract
27Al and 63Cu NMR measurements in 3% Al-doped La1.85Sr0.15CuO4 (LSCO) have revealed that the T dependences of the Knight shift, 27K(T), and the nuclear-spin-lattice relaxation rate, 27(1/T1), are dominated by local moments induced at neighboring Cu sites by the Al impurity. These experiments prove that spin fluctuation of induced moments is mainly due to the local spin-exchange coupling, Jsd, with conducting holes. This novel T dependence of 27(1/T1) has led to a reliable estimation of Jsd=0.055eV, and the extraction of the Tc reduction rate, ΔTc=0.62K/Al% based on the magnetic pair-breaking scheme, which is by more than 1 order of magnitude smaller than the experimental value of ΔTc=23K/Al%.
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. | 28.2 | Pressure not reported | unknown |
| La1.85Sr0.15CuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 17.6 | Pressure not reported | unknown |
| La1.85Sr0.15CuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 0 | Pressure not reported | unknown |
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