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Coherent Ferromagnetic Precipitate and Anomalies in the Heat Conduction and Thermopower of Mn_{2-x}Cr_{x}Sb Single Crystals

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Kattwinkel A., Kraus E., Kleeberg C., Groń T., Bärner K.

Acta Physica Polonica A

1998

vol. 93

issue 5-6

745-762

The heat diffusivity D, the electrical resistivity ρ and the thermoelectric power S of tetragonal Mn_{2-x}Cr_{x}Sb single crystals with 0.02 < x < 0.12 have been measured in the temperature range of 90 K < T < 350 K and along different crystal axes. The heat conductivity κ and σ = 1/ρ are anisotropic along the crystal axes a, c with a ratio of 2:1. κ(T) , ρ(T) and S(T) show anomalies at the spin reorientation temperature T_{Rm} of the matrix (M) Mn_{2-x}Cr_{x}Sb, but also at that of the coherent ferromagnetic precipitate (P) Mn_{1.037}Cr_{0.11}Sb, T_{R}_{p} which is assigned to variations in the spin dependent scattering at the M /P interfaces via changes in the relative orientation of the magnetization vectors of matrix and precipitate (spin valve effect).

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1 Acta Physica Polonica A

1 1998

1 Bärner K.

1 Groń T.

1 Kattwinkel A.

1 Kleeberg C.

1 Kraus E.

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Coherent Ferromagnetic Precipitate and Anomalies in the Heat Conduction and Thermopower of Mn_{2-x}Cr_{x}Sb Single Crystals