corner
corner
APS » Journals » Phys. Rev. B » Volume 57 » Issue 13
< Previous Article | Next Article >

Phys. Rev. B 57, 7841–7845 (1998)

Transport properties, magnetic ordering, and hyperfine interactions in Fe-doped La0.75Ca0.25MnO3: Localization-delocalization transition

Download: PDF (103 kB) Buy this article Export: BibTeX or EndNote (RIS)

S. B. Ogale*, R. Shreekala, Ravi Bathe, S. K. Date†, and S. I. Patil
Center for Advanced Studies in Materials Science and Solid State Physics, Department of Physics, University of Pune, Pune 411007, India

B. Hannoyer and F. Petit
Universite de Rouen, LASTSM-IUT, 76821 Mont-Saint-Aignan Cedex, France

G. Marest
Institut de Physique Nucleaire de Lyon, IN2P3 et Universite Claude Bernard, Lyon I, 43 Bld du 11 Novembre 1918, 69622 Villeurbanne, France

Received 22 October 1997; published in the issue dated 1 April 1998

Transport properties of La0.75Ca0.25Mn1-xFexO3+y ceramics are examined for “x” values from 0 to 0.05. Dramatic changes are observed in the resistivity and its temperature dependence as “x” increases above about 0.04. Temperature-dependent Mössbauer spectroscopy and magnetization studies are also performed. These data suggest that transport in this system necessarily involves quasiparticle excitation in association with the double exchange process and it undergoes localization-delocalization-type transition at a critical dopant concentration.

© 1998 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevB.57.7841
DOI:
10.1103/PhysRevB.57.7841
PACS:
75.50.Cc, 72.15.Gd, 75.30.-m, 76.80.+y

*Presently at the Center for Superconductivity, University of Maryland, College Park, MD 20742. Electronic address: ogale@squid.umd.edu

†Also at National Chemical Laboratory, Pashan, Pune 411 008, India.

 
< Previous Article | Next Article >