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Phys. Rev. B 57, R8115–R8118 (1998)

Reentrant transition from an incipient charge-ordered state to a ferromagnetic metallic state in a rare-earth manganate

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Anthony Arulraj, Amlan Biswas, A. K. Raychaudhuri, and C. N. R. Rao*
Solid State & Structural Chemistry Unit and Department of Physics, Indian Institute of Science, Bangalore 560 012, India

P. M. Woodward, T. Vogt, and D. E. Cox
Physics Department, Brookhaven National Laboratory, Upton, New York 11973

A. K. Cheetham
Materials Research Laboratory, University of California, Santa Barbara, California 93106

Received 15 December 1997; published in the issue dated 1 April 1998

A reentrant transition from an incipient charge-ordered (CO) state to a charge-delocalized ferromagnetic (CDFM) state has been established in the manganate Nd0.25La0.25Ca0.5MnO3, in which the average A-site ionic radius is 1.19 Å. The reentrant CDFM phase is associated with a first-order phase transition that reduces the orthorhombic distortion of the lattice, in contrast to the CO transition in other manganates where the orthorhombically distorted CO state is stabilized at low temperatures. At the CO-CDFM transition, there is a collapse of the charge-ordering gap as measured by vacuum tunneling spectroscopy.

© 1998 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevB.57.R8115
DOI:
10.1103/PhysRevB.57.R8115
PACS:
75.70.Pa, 72.20.My, 72.80.Sk

*Electronic address: cnrrao@sscu.iisc.ernet.in

 
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