Comparison of negative magnetoresistance mechanisms in manganese perovskites and chromium spinels

Описание

Тип публикации: статья из журнала

Год издания: 1999

Идентификатор DOI: 10.1134/1.1131064

Аннотация: A transition of the field dependence of the electrical resistivity from a square law (similar to H-2) above T-c to a linear function (similar to H) below T-c is observed in the degenerate ferromagnetic semiconductor HgCr2Se4(n). Together with the large negative magnetoresistance, these magnetoelectric effects correspond to effects Показать полностьюobserved in the perovskite-type oxides La1-xCaxMnOdelta. Inasmuch as the undoped semiconductor HgCr2Se4 is a ferromagnet with approximately the same critical temperature as the doped semiconductor and in view of the total lack of data on the Jahn-Teller effect in this compound, we infer that our results cast doubt on existing hypotheses (polaron and binary exchange) regarding the origin of the giant magnetoresistance in La1-xCaxMnOdelta. Impurity sd scattering is discussed as a possible magnetoresistance mechanism for both compounds. (C) 1999 American Institute of Physics. [S1063-7834(99)01710-4].

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Издание

Журнал: PHYSICS OF THE SOLID STATE

Выпуск журнала: Vol. 41, Is. 10

Номера страниц: 1652-1655

ISSN журнала: 10637834

Место издания: NEW YORK

Издатель: MAIK NAUKA/INTERPERIODICA/SPRINGER

Персоны

  • Gavrichkov V.A. (L. V. Kirenskii Inst. of Phys., S.,Russian Academy of Sciences)
  • Ivanova N.B. (L. V. Kirenskii Inst. of Phys., S.,Russian Academy of Sciences)
  • Ovchinnikov S.G. (L. V. Kirenskii Inst. of Phys., S.,Russian Academy of Sciences)
  • Balaev A.D. (L. V. Kirenskii Inst. of Phys., S.,Russian Academy of Sciences)
  • Aminov T.G. (N. S. Kurnakov Inst. of Gen. and I.,Russian Academy of Sciences)
  • Shabunina G.G. (N. S. Kurnakov Inst. of Gen. and I.,Russian Academy of Sciences)
  • Chernov V.K. (Krasnoyarsk Stt. Tech. University)
  • Petukhov M.V. (Krasnoyarsk Stt. Tech. University)

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