Contrasting Ni- and Zn-substitution effects on magnetic properties and superconductivity in La2−xSrxCuO4
T. Nakano, N. Momono, T. Nagata, M. Oda, M. Ido
DOI 10.1103/PhysRevB.58.5831 · Physical Review B
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Abstract
Both Ni- and Zn-substitution effects on superconducting and magnetic properties of La2−xSrxCuO4 were studied by measuring the magnetic susceptibility χ and the electronic specific heat Cel at T≪Tc. In Ni-substituted samples with x>~0.14, the local nature of the spin correlation among 3d spins remains almost unchanged even on Ni sites at low Ni concentrations, where Ni atoms are substituted as Ni3+ ions. On the other hand, in Zn-substituted samples the 3d-spin correlation is seriously disturbed on host Cu sites around each Zn site. The depression of Tc and the residual γ value at T≪Tc indicate that the suppression of the superconductivity in Zn-substituted samples is much stronger than that in Ni3+-substituted ones. The suppression of the superconductivity in the Ni3+-substituted samples can be understood in the context of a potential scattering of the Cooper pairs in a d-wave superconductor. On the other hand, the strong suppression of the superconductivity in the Zn-substituted samples will occur through the local disturbance of the 3d-spin correlation on host Cu sites around each Zn ion.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| La2-xSrxCuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
| La2-xSrxCu1-yNiyO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
| La2-xSrxCu1-yZnyO4 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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