Pressure and substitution effects on transport and magnetic properties of Y1-xRxCo2 systems with static magnetic disorder

Masataka Takeda; Atsushi Teruya; Shintaro Watanabe; Sentaro Hirakawa; Yuichi Hiranaka; Ai Nakamura; Yoshinao Takaesu; Kiyoharu Uchima; Masato Hedo; Takao Nakama; Katsuma Yagasaki; Kazuyuki Matsubayashi; Yoshiya Uwatoko; Alexander T. Burkov

doi:10.7566/JPSJ.82.014708

Pressure and substitution effects on transport and magnetic properties of Y_1-xR_xCo₂ systems with static magnetic disorder

Masataka Takeda, Atsushi Teruya, Shintaro Watanabe, Sentaro Hirakawa, Yuichi Hiranaka, Ai Nakamura, Yoshinao Takaesu, Kiyoharu Uchima, Masato Hedo, Takao Nakama, Katsuma Yagasaki, Kazuyuki Matsubayashi, Yoshiya Uwatoko, Alexander T. Burkov

Research output: Contribution to journal › Article

1 Citation (Scopus)

Abstract

The electrical resistivity and thermopower of light- and heavy-rare-earth-based pseudo-binary Y_1-xR_xCo₂ (R = Nd, Gd, and Tb) alloys are measured at temperatures from 2 to 300K under pressures up to 3.5 GPa. The resistivity and thermopower of Y _1-xR_xCo₂ show unusual large variations with atomic substitution and pressure in the range of x < x_m, where an inhomogeneous magnetization of the Co 3d electron subsystem is observed. These results indicate that the low-temperature transport properties of Y _1-xNd_xCo₂, as well as of Y_1-xR ^H_xCo₂ (R^H = heavy rare earth) alloys, are related to conduction electron scattering due to the static magnetic disorder in the itinerant Co 3d electron subsystem. We found that there is a universal relationship between d ln T_C/dP and x/x_m in Y_1-xR_xCo₂ alloys, where x_m is the boundary composition, which separates the alloy phase diagram into regions with uniform and nonuniform magnetizations of the Co-3d electron subsystem.

Original language	English
Article number	014708
Journal	journal of the physical society of japan
Volume	82
Issue number	1
DOIs	https://doi.org/10.7566/JPSJ.82.014708
Publication status	Published - 2013 Jan 1
Externally published	Yes

Keywords

Curie temperature
Laves phase
Pressure effect
Resistivity
Substitution effect
Thermopower

ASJC Scopus subject areas

Physics and Astronomy(all)

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Takeda, M., Teruya, A., Watanabe, S., Hirakawa, S., Hiranaka, Y., Nakamura, A., Takaesu, Y., Uchima, K., Hedo, M., Nakama, T., Yagasaki, K., Matsubayashi, K., Uwatoko, Y., & Burkov, A. T. (2013). Pressure and substitution effects on transport and magnetic properties of Y_1-xR_xCo₂ systems with static magnetic disorder. journal of the physical society of japan, 82(1), [014708]. https://doi.org/10.7566/JPSJ.82.014708

Pressure and substitution effects on transport and magnetic properties of Y_1-xR_xCo₂ systems with static magnetic disorder. / Takeda, Masataka; Teruya, Atsushi; Watanabe, Shintaro; Hirakawa, Sentaro; Hiranaka, Yuichi; Nakamura, Ai; Takaesu, Yoshinao; Uchima, Kiyoharu; Hedo, Masato; Nakama, Takao; Yagasaki, Katsuma; Matsubayashi, Kazuyuki; Uwatoko, Yoshiya; Burkov, Alexander T.

In: journal of the physical society of japan, Vol. 82, No. 1, 014708, 01.01.2013.

Research output: Contribution to journal › Article

Takeda, M, Teruya, A, Watanabe, S, Hirakawa, S, Hiranaka, Y, Nakamura, A, Takaesu, Y, Uchima, K, Hedo, M, Nakama, T, Yagasaki, K, Matsubayashi, K, Uwatoko, Y & Burkov, AT 2013, 'Pressure and substitution effects on transport and magnetic properties of Y_1-xR_xCo₂ systems with static magnetic disorder', journal of the physical society of japan, vol. 82, no. 1, 014708. https://doi.org/10.7566/JPSJ.82.014708

Takeda, Masataka ; Teruya, Atsushi ; Watanabe, Shintaro ; Hirakawa, Sentaro ; Hiranaka, Yuichi ; Nakamura, Ai ; Takaesu, Yoshinao ; Uchima, Kiyoharu ; Hedo, Masato ; Nakama, Takao ; Yagasaki, Katsuma ; Matsubayashi, Kazuyuki ; Uwatoko, Yoshiya ; Burkov, Alexander T. / Pressure and substitution effects on transport and magnetic properties of Y_1-xR_xCo₂ systems with static magnetic disorder. In: journal of the physical society of japan. 2013 ; Vol. 82, No. 1.

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abstract = "The electrical resistivity and thermopower of light- and heavy-rare-earth-based pseudo-binary Y1-xRxCo2 (R = Nd, Gd, and Tb) alloys are measured at temperatures from 2 to 300K under pressures up to 3.5 GPa. The resistivity and thermopower of Y 1-xRxCo2 show unusual large variations with atomic substitution and pressure in the range of x < xm, where an inhomogeneous magnetization of the Co 3d electron subsystem is observed. These results indicate that the low-temperature transport properties of Y 1-xNdxCo2, as well as of Y1-xR HxCo2 (RH = heavy rare earth) alloys, are related to conduction electron scattering due to the static magnetic disorder in the itinerant Co 3d electron subsystem. We found that there is a universal relationship between d ln TC/dP and x/xm in Y1-xRxCo2 alloys, where xm is the boundary composition, which separates the alloy phase diagram into regions with uniform and nonuniform magnetizations of the Co-3d electron subsystem.",

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author = "Masataka Takeda and Atsushi Teruya and Shintaro Watanabe and Sentaro Hirakawa and Yuichi Hiranaka and Ai Nakamura and Yoshinao Takaesu and Kiyoharu Uchima and Masato Hedo and Takao Nakama and Katsuma Yagasaki and Kazuyuki Matsubayashi and Yoshiya Uwatoko and Burkov, {Alexander T.}",

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AU - Takeda, Masataka

AU - Teruya, Atsushi

AU - Watanabe, Shintaro

AU - Hirakawa, Sentaro

AU - Hiranaka, Yuichi

AU - Nakamura, Ai

AU - Takaesu, Yoshinao

AU - Uchima, Kiyoharu

AU - Hedo, Masato

AU - Nakama, Takao

AU - Yagasaki, Katsuma

AU - Matsubayashi, Kazuyuki

AU - Uwatoko, Yoshiya

AU - Burkov, Alexander T.

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N2 - The electrical resistivity and thermopower of light- and heavy-rare-earth-based pseudo-binary Y1-xRxCo2 (R = Nd, Gd, and Tb) alloys are measured at temperatures from 2 to 300K under pressures up to 3.5 GPa. The resistivity and thermopower of Y 1-xRxCo2 show unusual large variations with atomic substitution and pressure in the range of x < xm, where an inhomogeneous magnetization of the Co 3d electron subsystem is observed. These results indicate that the low-temperature transport properties of Y 1-xNdxCo2, as well as of Y1-xR HxCo2 (RH = heavy rare earth) alloys, are related to conduction electron scattering due to the static magnetic disorder in the itinerant Co 3d electron subsystem. We found that there is a universal relationship between d ln TC/dP and x/xm in Y1-xRxCo2 alloys, where xm is the boundary composition, which separates the alloy phase diagram into regions with uniform and nonuniform magnetizations of the Co-3d electron subsystem.

AB - The electrical resistivity and thermopower of light- and heavy-rare-earth-based pseudo-binary Y1-xRxCo2 (R = Nd, Gd, and Tb) alloys are measured at temperatures from 2 to 300K under pressures up to 3.5 GPa. The resistivity and thermopower of Y 1-xRxCo2 show unusual large variations with atomic substitution and pressure in the range of x < xm, where an inhomogeneous magnetization of the Co 3d electron subsystem is observed. These results indicate that the low-temperature transport properties of Y 1-xNdxCo2, as well as of Y1-xR HxCo2 (RH = heavy rare earth) alloys, are related to conduction electron scattering due to the static magnetic disorder in the itinerant Co 3d electron subsystem. We found that there is a universal relationship between d ln TC/dP and x/xm in Y1-xRxCo2 alloys, where xm is the boundary composition, which separates the alloy phase diagram into regions with uniform and nonuniform magnetizations of the Co-3d electron subsystem.

KW - Curie temperature

KW - Laves phase

KW - Pressure effect

KW - Resistivity

KW - Substitution effect

KW - Thermopower

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