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Title: Changes in the electronic structure and spin dynamics across the metal-insulator transition in LaLa1-xSrxCoO3

Abstract

The magnetoelectronic properties of La1-xSrxCoO3, 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 139La NMR 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. Lastly, this behavior is accounted for in terms of the evolution of the electronic structure and dynamics with cluster size.

Authors:
 [1];  [1];  [1];  [1];  [1];  [1];  [2];  [2]
  1. Florida State Univ., Tallahassee, FL (United States). National High Magnetic Field Lab. (MagLab)
  2. Argonne National Lab. (ANL), Argonne, IL (United States). Materials Science Division
Publication Date:
Research Org.:
Argonne National Laboratory (ANL), Argonne, IL (United States)
Sponsoring Org.:
National Science Foundation (NSF); USDOE Office of Science (SC), Basic Energy Sciences (BES)
OSTI Identifier:
1339091
Alternate Identifier(s):
OSTI ID: 1235970
Grant/Contract Number:  
AC02-06CH11357; DMR-1157490
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Physical Review, B: Condensed Matter
Additional Journal Information:
Journal Volume: 93; Journal Issue: 2; Journal ID: ISSN 0163-1829
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; 36 MATERIALS SCIENCE

Citation Formats

Smith, R. X., Hoch, M. J. R., Moulton, W. G., Kuhns, P. L., Reyes, A. P., Boebinger, G. S., Zheng, H., and Mitchell, J. F. Changes in the electronic structure and spin dynamics across the metal-insulator transition in LaLa1-xSrxCoO3. United States: N. p., 2016. Web. doi:10.1103/PhysRevB.93.024204.
Smith, R. X., Hoch, M. J. R., Moulton, W. G., Kuhns, P. L., Reyes, A. P., Boebinger, G. S., Zheng, H., & Mitchell, J. F. Changes in the electronic structure and spin dynamics across the metal-insulator transition in LaLa1-xSrxCoO3. United States. https://doi.org/10.1103/PhysRevB.93.024204
Smith, R. X., Hoch, M. J. R., Moulton, W. G., Kuhns, P. L., Reyes, A. P., Boebinger, G. S., Zheng, H., and Mitchell, J. F. 2016. "Changes in the electronic structure and spin dynamics across the metal-insulator transition in LaLa1-xSrxCoO3". United States. https://doi.org/10.1103/PhysRevB.93.024204. https://www.osti.gov/servlets/purl/1339091.
@article{osti_1339091,
title = {Changes in the electronic structure and spin dynamics across the metal-insulator transition in LaLa1-xSrxCoO3},
author = {Smith, R. X. and Hoch, M. J. R. and Moulton, W. G. and Kuhns, P. L. and Reyes, A. P. and Boebinger, G. S. and Zheng, H. and Mitchell, J. F.},
abstractNote = {The magnetoelectronic properties of La1-xSrxCoO3, 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 139La NMR 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. Lastly, this behavior is accounted for in terms of the evolution of the electronic structure and dynamics with cluster size.},
doi = {10.1103/PhysRevB.93.024204},
url = {https://www.osti.gov/biblio/1339091}, journal = {Physical Review, B: Condensed Matter},
issn = {0163-1829},
number = 2,
volume = 93,
place = {United States},
year = {Mon Jan 25 00:00:00 EST 2016},
month = {Mon Jan 25 00:00:00 EST 2016}
}

Journal Article:

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Cited by: 1 work
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