The study of magnon-drag effects in the thermopower of CuCr 2X4 (X = S, Se and Te)

T. S. Tripathi; G. C. Tewari; A. K. Rastogi

doi:10.1088/1742-6596/200/3/032060

The study of magnon-drag effects in the thermopower of CuCr ₂X₄ (X = S, Se and Te)

T. S. Tripathi, G. C. Tewari, A. K. Rastogi

Not published at Aalto University

Research output: Contribution to journal › Conference article › Scientific › peer-review

9 Citations (Scopus)

Abstract

The electrical resistivity ρ and thermopower S of metallic ferromagnets CuCr₂X₄ (X=S,Se or Te) are measured at low temperatures and in an external magnetic field of 1.5 Tesla. These properties are dominated by strong scattering effects in their ferromagnetic phase, resulting in (a) ρ(T) ∼A T²dependence with very large value of coefficient A ≈ 1 - 3×10^-8 Ω-cm/K² in resistivity and (b) a peak in the thermopower around T_C/3 . Thermopower is further increased by crystalline order and by the alignment of magnetic domains in an external magnetic field as has been found for Cu_1+x Cr ₂Te₄. We have interpreted these effects as due to strongly coherent momentum conserving electron-magnon scattering giving a large T ² - contribution in resistivity and a large drag effect in thermopower.

Original language	English
Article number	032060
Journal	Journal of Physics: Conference Series
Volume	200
Issue number	SECTION 3
DOIs	https://doi.org/10.1088/1742-6596/200/3/032060
Publication status	Published - 1 Jan 2010
MoE publication type	A4 Article in a conference publication

Keywords

Magnon drag
Phonon drag
Spinels
Thermopower

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10.1088/1742-6596/200/3/032060

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abstract = "The electrical resistivity ρ and thermopower S of metallic ferromagnets CuCr2X4 (X=S,Se or Te) are measured at low temperatures and in an external magnetic field of 1.5 Tesla. These properties are dominated by strong scattering effects in their ferromagnetic phase, resulting in (a) ρ(T) ∼A T2dependence with very large value of coefficient A ≈ 1 - 3×10-8 Ω-cm/K2 in resistivity and (b) a peak in the thermopower around TC/3 . Thermopower is further increased by crystalline order and by the alignment of magnetic domains in an external magnetic field as has been found for Cu1+x Cr 2Te4. We have interpreted these effects as due to strongly coherent momentum conserving electron-magnon scattering giving a large T 2 - contribution in resistivity and a large drag effect in thermopower.",

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