Charge Segregation, Cluster Spin Glass, and Superconductivity in La1.94Sr0.06CuO4

M.-H. Julien; F. Borsa; P. Carretta; M. Horvatić; C. Berthier; C. T. Lin

doi:10.1103/PhysRevLett.83.604

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Charge Segregation, Cluster Spin Glass, and Superconductivity in La1.94Sr0.06CuO4

M.-H. Julien, F. Borsa, P. Carretta, M. Horvatić, C. Berthier, C. T. Lin

DOI 10.1103/PhysRevLett.83.604 · Physical Review Letters

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Abstract

A 63Cu and 139La NMR/NQR study of superconducting (Tc=8K) La1.94Sr0.06CuO4 single crystal is reported. Coexistence of spin-glass and superconducting phases is found below ∼5K from 139La NMR relaxation. 63Cu and 139La NMR spectra show that, upon cooling, CuO2 planes progressively separate into two magnetic phases, one of them having enhanced antiferromagnetic correlations. These results establish the antiferromagnetic-cluster nature of the spin glass. We discuss how this phase can be related to the microsegregation of mobile holes and to the possible pinning of charge stripes.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
La1.94Sr0.06CuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	8	Pressure not reported	onset