Charge Segregation, Cluster Spin-Glass and Superconductivity in La1.94Sr0.06CuO4
M.-H. Julien, F. Borsa, P. Carretta, M. Horvatic, C. Berthier, C.T., Lin
TL;DR
This study uses NMR/NQR techniques to reveal the coexistence of spin-glass and superconducting phases in La1.94Sr0.06CuO4, showing phase separation and magnetic correlations that shed light on the material's complex electronic behavior.
Contribution
It provides new insights into the microscopic coexistence and phase separation of magnetic and superconducting states in La1.94Sr0.06CuO4 using NMR/NQR analysis.
Findings
Coexistence of spin-glass and superconducting phases below 5 K.
Progressive separation of CuO2 planes into magnetic phases upon cooling.
Identification of AF-cluster nature of the spin-glass phase.
Abstract
A 63Cu and 139La NMR/NQR study of superconducting (Tc=7 K) La1.94Sr0.06CuO4 single crystal is reported. Coexistence of spin-glass and superconducting phases is found below ~5 K 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 AF-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.
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