Electrical and Magnetic Properties of Quasicrystal Approximants RCd6 (R: Rare Earth)
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概要
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We measured the electrical resistivity, magnetic susceptibility, magnetization, and specific heat of the quasicrystal approximants RCd6 (R: rare earth, Y--Lu) with a body-centered cubic (bcc) crystal structure. Single crystals were grown by the Cd-self flux method and annealing method. We confirmed that the structural order--disorder transition is realized at about 160 K when the lattice constant a is larger than 15.481 Å in YCd6, namely, for R = Pr, Nd, Sm, Gd, Tb, Dy, and Yb. At lower temperatures, RCd6 compounds, except non-4f reference compounds YCd6 and LuCd6, and a divalent compound YbCd6, are found to order antiferromagnetically. We clarified that the structural order--disorder transition has a great influence on the magnetic ordering and transport properties. The Néel temperature of RCd6 (R: Nd, Sm, Tb, and Dy) with the structural order--disorder transition is appreciably higher than the de Gennes scaling normalized by the Néel temperature of GdCd6, while the the Néel temperature of RCd6 (R: Ho, Er, and Tm) without the structural transition approximately follows the de Gennes scaling. Moreover, the electrical resistivity of RCd6 with the structural transition decreases monotonically below the Néel temperature, while it increases below the Néel temperature and a large residual resistivity remains at low temperatures in RCd6 without the structural transition. The contribution of an Einstein oscillator to the phonon specific heat is also discussed in YCd6 and LuCd6.
- 2012-02-15
著者
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SETTAI Rikio
Graduate School of Science, Osaka University
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Honda Fuminori
Graduate School Of Science Osaka University
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Yamamoto Etsuji
Advanced Science Research Center Japan Atomic Energy Agency
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Takeuchi Tetsuya
Low Temperature Center Osaka University
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Onuki Yoshichika
Graduate School Of Science Osaka University
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HAGA Yoshinori
Advance Science Research Center, Japan Atomic Energy Agency
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Yoshiuchi Shingo
Graduate School of Science, Osaka University, Toyonaka, Osaka 560-0043
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Hirose Yusuke
Graduate School of Science, Osaka University, Toyonaka, Osaka 560-0043
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Hirose Yusuke
Graduate School of Science, Osaka University, Toyonaka, Osaka 560-0043, Japan
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Yoshiuchi Shingo
Graduate School of Science, Osaka University, Toyonaka, Osaka 560-0043, Japan
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Taga Yuki
Graduate School of Science, Osaka University, Toyonaka, Osaka 560-0043, Japan
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Ota Hisashi
Graduate School of Science, Osaka University, Toyonaka, Osaka 560-0043, Japan
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MORI Akinobu
Graduate School of Science, Osaka University, Toyonaka, Osaka 560-0043, Japan
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Iwakawa Ken
Graduate School of Science, Osaka University, Toyonaka, Osaka 560-0043, Japan
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Settai Rikio
Graduate School of Science, Osaka University, Toyonaka, Osaka 560-0043, Japan
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Haga Yoshinori
Advanced Science Research Center, Japan Atomic Energy Agency, Tokai, Ibaraki 319-1195, Japan
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Honda Fuminori
Graduate School of Engineering Science, Osaka University, Toyonaka, Osaka 560-8531, Japan
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