Changes in the electronic structure and spin dynamics across the metal-insulator transition in La1xSrxCoO3

R. X. Smith, M. J. R. Hoch, W. G. Moulton, P. L. Kuhns, A. P. Reyes, G. S. Boebinger, H. Zheng, and J. F. Mitchell
Phys. Rev. B 93, 024204 – Published 25 January 2016

Abstract

The magnetoelectronic properties of La1xSrxCoO3, which include giant magnetoresistance, are strongly dependent on the level of hole doping. The system evolves, with increasing x, from a spin glass insulator to a metallic ferromagnet with a metal-insulator (MI) transition at xC 0.18. Nanoscale phase separation occurs in the insulating phase and persists, to some extent, into the just-metallic phase. The present experiments at 4.2 K have used La139 nuclear magnetic resonance to investigate the transition from hopping dynamics for x < xC to Korringa-like ferromagnetic metal behavior for x > xC. A marked decrease in the spin-lattice relaxation rate is found in the vicinity of xC as the MI transition is crossed. This behavior is accounted for in terms of the evolution of the electronic structure and dynamics with cluster size.

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  • Received 15 July 2015
  • Revised 30 November 2015

DOI:https://doi.org/10.1103/PhysRevB.93.024204

©2016 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

R. X. Smith*, M. J. R. Hoch, W. G. Moulton, P. L. Kuhns, A. P. Reyes, and G. S. Boebinger

  • National High Magnetic Field Laboratory Florida State University Tallahassee, Florida 32310, USA

H. Zheng and J. F. Mitchell

  • Materials Science Division Argonne National Laboratory Argonne, Illinois 60439, USA

  • *Current address: Laboratory of FMRI Technology (LOFT), Department of Neurology, Ahmanson-Lovelace Brain Mapping Center, University of California, Los Angeles, California.
  • Deceased.

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Issue

Vol. 93, Iss. 2 — 1 January 2016

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