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Phys. Rev. B 73, 020404(R) (2006) [4 pages]

Glassy transport phenomena in a phase-separated perovskite cobaltite

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J. Wu,¹ H. Zheng,² J. F. Mitchell,² and C. Leighton¹
¹Department of Chemical Engineering and Materials Science, University of Minnesota, Minneapolis, Minnesota 55455, USA
²Materials Science Division, Argonne National Laboratory, Argonne, Illinois 60439, USA

Rapid

Received 6 July 2005; revised 9 November 2005; published 6 January 2006

Wedemonstrate that single-crystal La_1–xSr_xCoO₃ in the semiconducting spin-glass phase (x<0.18)displays a strong interplay between electronic conduction and spin-glass freezing.The resistivity exhibits a bifurcation of zero-field cooled and field-cooledtemperature dependences, glassy response to application and removal of magneticfields, and, most remarkably, a waiting time or "aging" effectdirectly in the resistivity. This behavior has its origin inthe magnetoelectronic phase separation into nanoscopic ferromagnetic clusters embedded ina nonferromagnetic matrix, analogous to relaxor ferroelectrics.

©2006 The American Physical Society

URL:	http://link.aps.org/doi/10.1103/PhysRevB.73.020404
DOI:	10.1103/PhysRevB.73.020404
PACS:	75.50.Lk; 72.20.-i; 75.47.Gk 75.50.Lk Spin glasses and other random magnets 72.20.-i Electrical conductivity phenomena in semiconductors and insulators 75.47.Gk Colossal magnetoresistance YEAR: 2006
KEYWORDS:	lanthanum compounds, strontium compounds, spin glasses, magnetic semiconductors, electrical resistivity, magnetic transitions, phase separation, nanostructured materials

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