Emission Mossbauer study of CMR manganite La0.8Ca0.2MnO3.

II. Step by step snapshots of the metal-insulator transition

Автор(и)

  • Vladimir Chechersky Department of Chemistry, Drexel University, Philadelphia, PA 19104, U.S.A.
  • Kiyoshi Nomura Department of Chemistry, Drexel University, Philadelphia, PA 19104, U.S.A.
  • Amar Nath Department of Chemistry, Drexel University, Philadelphia, PA 19104, U.S.A.
  • Honglyoul Ju Center for Superconductivity Research, Department of Physics, University of Maryland, College Park, MD 20742, U.S.A.
  • Richard L. Greene Center for Superconductivity Research, Department of Physics, University of Maryland, College Park, MD 20742, U.S.A.

DOI:

https://doi.org/10.1063/1.593422

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Анотація

We follow the step by step progression of events while approaching Curie temperature TC from below using 57Co substituent as microprobe in an emission Mossbauer study combined with resistivity measurements. In the temperature range 0.33 < T/TC < or = 1, the material consists of a mixture of ferromagnetic and paramagnetic regions within the same matrix. An increase of the amount of paramagnetic fraction is accompanied by a decrease in electron delocalization in the ferromagnetic regions. At T > or = TC, the electrons are localized to neighboring Mn4+/Mn3+ pairs only, in about 46% of the paramagnetic species. The strength with which Mn atoms are bound to the neighbors also decreases progressively and rather steeply in the range 0.65 < or = T/T C = 1. Zero field resistivity, rho0, follows linearly with the amount of paramagnetic phase in the range 0.65 < or = T/TC < or 1 and still show metal-like behavior up to T/TC ~ 1.03.

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Опубліковано

1997-07-10

Як цитувати

(1)
Chechersky, V.; Nomura, K.; Nath, A.; Ju, H.; Greene, R. L.

Emission Mossbauer Study of CMR Manganite La0.8Ca0.2MnO3.

II. Step by Step Snapshots of the Metal-Insulator Transition. Fiz. Nizk. Temp. 1997, 23, 732-737.

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Низькотемпературний магнетизм