Magnetic polaron conduction in the colossal magnetoresistance material Fe1xCdxCr2S4

Zhaorong Yang, Xinyu Bao, Shun Tan, and Yuheng Zhang
Phys. Rev. B 69, 144407 – Published 5 April 2004
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Abstract

The magnetotransport properties of the spinel Fe1xCdxCr2S4 have been studied. We found that the magnetic polarons dominate the conduction at temperatures above the Curie temperature Tc. Upon substitution of Fe by Cd, the carrier density decreases, and the magnetoresistance increases. As a result, the magnetic polarons become more stable, in agreement with the theoretical predictions of Majumdar and Littlewood for the magnetoresistance in low carrier density ferromagnets. The evolution of magnetic polarons in CdCr2S4 has been studied with electron spin resonance (ESR) measurements. As the temperature increases, the peak-to-peak linewidth ΔHpp decreases in a broad temperature range, providing direct evidence for the existence of magnetic polarons. The analysis of the ESR spectra reveals the existence of two temperature scales, which are related to the evolution of the magnetic polarons. The first temperature, denoted as Tp, corresponds to the formation of magnetic polarons. The second temperature, denoted as T*, can be related to the temperature where correlations among the magnetic polarons occur.

  • Received 3 April 2003

DOI:https://doi.org/10.1103/PhysRevB.69.144407

©2004 American Physical Society

Authors & Affiliations

Zhaorong Yang*, Xinyu Bao, Shun Tan, and Yuheng Zhang

  • Structure Research Laboratory, University of Science and Technology of China, Academia Sinica, Hefei, Anhui 230026, People’s Republic of China
  • National High Magnetic Field Laboratory, Hefei, Anhui 230026, People’s Republic of China

  • *Present address: Laboratorium voor Vaste-Stoffysica en Magnetisme, K. U. Leuven, Celestijnenlaan 200 D, B-3001 Leuven, Belgium, E-mail address: zhaorong.yang@fys.kuleuven.ac.be

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Vol. 69, Iss. 14 — 1 April 2004

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