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

6 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

Access to Document

10.1088/1742-6596/200/3/032060

Fingerprint Dive into the research topics of 'The study of magnon-drag effects in the thermopower of CuCr <sub>2</sub>X<sub>4</sub> (X = S, Se and Te)'. Together they form a unique fingerprint.

Cite this

@article{5f1c1970fc084aeca2b0344866099b90,

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

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.",

keywords = "Magnon drag, Phonon drag, Spinels, Thermopower",

author = "Tripathi, {T. S.} and Tewari, {G. C.} and Rastogi, {A. K.}",

year = "2010",

month = jan,

day = "1",

doi = "10.1088/1742-6596/200/3/032060",

language = "English",

volume = "200",

journal = "Journal of Physics: Conference Series",

issn = "1742-6588",

publisher = "IOP Publishing Ltd.",

number = "SECTION 3",

}

TY - JOUR

T1 - The study of magnon-drag effects in the thermopower of CuCr 2X4 (X = S, Se and Te)

AU - Tripathi, T. S.

AU - Tewari, G. C.

AU - Rastogi, A. K.

PY - 2010/1/1

Y1 - 2010/1/1

N2 - 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.

AB - 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.

KW - Magnon drag

KW - Phonon drag

KW - Spinels

KW - Thermopower

UR - http://www.scopus.com/inward/record.url?scp=77957131885&partnerID=8YFLogxK

U2 - 10.1088/1742-6596/200/3/032060

DO - 10.1088/1742-6596/200/3/032060

M3 - Conference article

AN - SCOPUS:77957131885

VL - 200

JO - Journal of Physics: Conference Series

JF - Journal of Physics: Conference Series

SN - 1742-6588

IS - SECTION 3

M1 - 032060

ER -