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

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1 Citation (Scopus)

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.

Original languageEnglish
Article number014708
Journaljournal of the physical society of japan
Volume82
Issue number1
DOIs
Publication statusPublished - 2013 Jan 1
Externally publishedYes

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 Y1-xRxCo2 systems with static magnetic disorder. journal of the physical society of japan, 82(1), [014708]. https://doi.org/10.7566/JPSJ.82.014708