Magnetic properties of the overdoped superconductor La2−xSrxCuO4 with and without Zn impurities
S. Wakimoto, R. J. Birgeneau, A. Kagedan, Hyunkyung Kim, I. Swainson, K. Yamada, H. Zhang
DOI 10.1103/PhysRevB.72.064521 · Physical Review B
Active bibliographic source — not scientific approval
Bibliographic access preserves source history; it does not approve extracted materials or validate reported claims. Review warnings on each occurrence separately.
Abstract
The magnetic properties of the Zn-substituted overdoped high-Tc superconductor La2−xSrxCu1−yZnyO4 have been studied by magnetization measurements and neutron scattering. Magnetization measurements reveal that for Zn-free samples with x⩾0.22 a Curie term is induced in the temperature dependence of the magnetic susceptibility implying the existence of local paramagnetic moments. The induced Curie constant corresponds to a moment of 0.5μB per additional Sr2+ ion that exceeds x=0.22. Zn substitution in the overdoped La2−xSrxCuO4 also induces a Curie term that corresponds to 1.2μB per Zn2+ ion, simultaneously suppressing Tc. The relationship between Tc and the magnitude of the Curie term for Zn-free La2−xSrxCuO4 with x⩾0.22 and for Zn-substituted La2−xSrxCuO4 with x=0.22 are closely similar. This signifies a general competitive relationship between the superconductivity and the induced paramagnetic moment. Neutron scattering measurements show that Zn substitution in overdoped La2−xSrxCuO4 anomalously enhances the inelastic magnetic scattering spectra around the (π,π) position, peaking at ω∼7meV. These facts are discussed on the basis of a “swiss-cheese” model of Zn-substituted systems as well as a microscopic phase separation scenario in the overdoped region indicated by muon-spin-relaxation measurements.
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-yZnyO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
Similar papers
Magnetism and superconductivity in doped La2CuO4
similarity 0.95M. Oda et al.
Source status unknown — claims are unverified
Strong thermal fluctuations in cuprate superconductors in magnetic fields above Tc
similarity 0.94Xujiang Jiang et al.
Source status unknown — claims are unverified
Lattice instabilities and the effect of copper-oxygen-sheet distortions on superconductivity in doped La2CuO4
similarity 0.94M. K. Crawford et al.
Source status unknown — claims are unverified
Magnetic properties of the overdoped superconductor LaSrCuO with and without Zn impurities
similarity 0.93S. Wakimoto et al. · 2005 · arXiv:cond-mat/0503534
Source status unknown — claims are unverified
Zn-induced spin dynamics in overdoped LaSrCuZnO
similarity 0.93Stephen D. Wilson et al. · 2011 · arXiv:1112.0775
Source status unknown — claims are unverified
Theory of Incommensurate Magnetic Correlations Across the Insulator-Superconductor Transition of Underdoped La2−xSrxCuO4
similarity 0.93Oleg P. Sushkov & Valeri N. Kotov
Source status unknown — claims are unverified