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Interface effects on magnetoresistance and magnetic-field-reduced Raman scattering in magnetite

Jian-Min Li*

A. C. H. Huan

Liang Wang, You-Wei Du, and Duan Feng

  • Department of Physics, National University of Singapore, Lower Kent Ridge Road, Singapore 119260
  • National Laboratory of Solid State Microstructure and Department of Physics, Nanjing University, Nanjing 210093, People’s Republic of China

  • Department of Physics, National University of Singapore, Lower Kent Ridge Road, Singapore 119260

  • National Laboratory of Solid State Microstructure and Department of Physics, Nanjing University, Nanjing 210093, People’s Republic of China

  • *Author to whom correspondence should be addressed. Electronic address: phylijm@nus.edu.sg
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Phys. Rev. B 61, 6876 – Published 1 March, 2000

DOI: https://doi.org/10.1103/PhysRevB.61.6876

Abstract

Our work demonstrates that magnetoresistance of the polycrystalline magnetite decreases with the reduction in average grain size, suggesting that the spin-dependent transporting phenomenon is associated with the interface microstructure. Also, the reducing peak intensity of the Raman spectra near 660 cm−1 was observed while its full width at half-maximum remains invariable, as applied a field. It demonstrates that the phonon mode becomes softening upon applying a field. A possible physical explanation is proposed that magnetic field-induced the enhanced electron-electron correlation. This is consistent with the previous results about magnetite.

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References (10)

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Outline

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Phys. Rev. B 61, 6876– Published 1 March, 2000
  • Received 14 September 1999

© 2000 American Physical Society

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