Motion of the guest ion as precursor to the first-order phase transition in the cage system GdB 6

Kazuaki Iwasa; Ryosuke Igarashi; Kotaro Saito; Claire Laulhé; Toshihiko Orihara; Satoru Kunii; Keitaro Kuwahara; Hironori Nakao; Youichi Murakami; Fumitoshi Iga; Masafumi Sera; Satoshi Tsutsui; Hiroshi Uchiyama; Alfred Q.R. Baron

doi:10.1103/PhysRevB.84.214308

Motion of the guest ion as precursor to the first-order phase transition in the cage system GdB ₆

Kazuaki Iwasa, Ryosuke Igarashi, Kotaro Saito, Claire Laulhé, Toshihiko Orihara, Satoru Kunii, Keitaro Kuwahara, Hironori Nakao, Youichi Murakami, Fumitoshi Iga, Masafumi Sera, Satoshi Tsutsui, Hiroshi Uchiyama, Alfred Q.R. Baron

SCI - Physics

Research output: Contribution to journal › Article › peer-review

18 Citations (Scopus)

Abstract

The motion of guest Gd ions in oversized boron cages in GdB ₆ was investigated from phonon spectra measurements obtained by inelastic x-ray scattering. The measured phonon modes soften by about 10% from 300 K down to T _N=16 K, in particular, the longitudinal phonon for the propagation vector q ₁=(1/2,0,0) that characterizes the distorted structure below T _N. Besides, the dispersion relation curves show kinklike anomalies at q _k=(0.38,0.38,0). The observed results imply that the motion of the guest Gd ion interplays with the f electrons magnetoelastically and with carriers via Fermi surface nesting. The anomalous properties previously reported for this material far above T _N originate from the strong electron-phonon coupling, which causes the motion of guest ions as precursors to the first-order phase transition.

Original language	English
Article number	214308
Journal	Physical Review B - Condensed Matter and Materials Physics
Volume	84
Issue number	21
DOIs	https://doi.org/10.1103/PhysRevB.84.214308
Publication status	Published - 2011 Dec 28

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Condensed Matter Physics

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Iwasa, K., Igarashi, R., Saito, K., Laulhé, C., Orihara, T., Kunii, S., Kuwahara, K., Nakao, H., Murakami, Y., Iga, F., Sera, M., Tsutsui, S., Uchiyama, H., & Baron, A. Q. R. (2011). Motion of the guest ion as precursor to the first-order phase transition in the cage system GdB ₆ Physical Review B - Condensed Matter and Materials Physics, 84(21), [214308]. https://doi.org/10.1103/PhysRevB.84.214308

Motion of the guest ion as precursor to the first-order phase transition in the cage system GdB ₆ . / Iwasa, Kazuaki; Igarashi, Ryosuke; Saito, Kotaro; Laulhé, Claire; Orihara, Toshihiko; Kunii, Satoru; Kuwahara, Keitaro; Nakao, Hironori; Murakami, Youichi; Iga, Fumitoshi; Sera, Masafumi; Tsutsui, Satoshi; Uchiyama, Hiroshi; Baron, Alfred Q.R.

In: Physical Review B - Condensed Matter and Materials Physics, Vol. 84, No. 21, 214308, 28.12.2011.

Research output: Contribution to journal › Article › peer-review

Iwasa, K, Igarashi, R, Saito, K, Laulhé, C, Orihara, T, Kunii, S, Kuwahara, K, Nakao, H, Murakami, Y, Iga, F, Sera, M, Tsutsui, S, Uchiyama, H & Baron, AQR 2011, 'Motion of the guest ion as precursor to the first-order phase transition in the cage system GdB ₆ ', Physical Review B - Condensed Matter and Materials Physics, vol. 84, no. 21, 214308. https://doi.org/10.1103/PhysRevB.84.214308

Iwasa, Kazuaki ; Igarashi, Ryosuke ; Saito, Kotaro ; Laulhé, Claire ; Orihara, Toshihiko ; Kunii, Satoru ; Kuwahara, Keitaro ; Nakao, Hironori ; Murakami, Youichi ; Iga, Fumitoshi ; Sera, Masafumi ; Tsutsui, Satoshi ; Uchiyama, Hiroshi ; Baron, Alfred Q.R. / Motion of the guest ion as precursor to the first-order phase transition in the cage system GdB ₆ In: Physical Review B - Condensed Matter and Materials Physics. 2011 ; Vol. 84, No. 21.

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abstract = "The motion of guest Gd ions in oversized boron cages in GdB 6 was investigated from phonon spectra measurements obtained by inelastic x-ray scattering. The measured phonon modes soften by about 10% from 300 K down to T N=16 K, in particular, the longitudinal phonon for the propagation vector q 1=(1/2,0,0) that characterizes the distorted structure below T N. Besides, the dispersion relation curves show kinklike anomalies at q k=(0.38,0.38,0). The observed results imply that the motion of the guest Gd ion interplays with the f electrons magnetoelastically and with carriers via Fermi surface nesting. The anomalous properties previously reported for this material far above T N originate from the strong electron-phonon coupling, which causes the motion of guest ions as precursors to the first-order phase transition.",

author = "Kazuaki Iwasa and Ryosuke Igarashi and Kotaro Saito and Claire Laulh{\'e} and Toshihiko Orihara and Satoru Kunii and Keitaro Kuwahara and Hironori Nakao and Youichi Murakami and Fumitoshi Iga and Masafumi Sera and Satoshi Tsutsui and Hiroshi Uchiyama and Baron, {Alfred Q.R.}",

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AU - Iwasa, Kazuaki

AU - Igarashi, Ryosuke

AU - Saito, Kotaro

AU - Laulhé, Claire

AU - Orihara, Toshihiko

AU - Kunii, Satoru

AU - Kuwahara, Keitaro

AU - Nakao, Hironori

AU - Murakami, Youichi

AU - Iga, Fumitoshi

AU - Sera, Masafumi

AU - Tsutsui, Satoshi

AU - Uchiyama, Hiroshi

AU - Baron, Alfred Q.R.

PY - 2011/12/28

Y1 - 2011/12/28

N2 - The motion of guest Gd ions in oversized boron cages in GdB 6 was investigated from phonon spectra measurements obtained by inelastic x-ray scattering. The measured phonon modes soften by about 10% from 300 K down to T N=16 K, in particular, the longitudinal phonon for the propagation vector q 1=(1/2,0,0) that characterizes the distorted structure below T N. Besides, the dispersion relation curves show kinklike anomalies at q k=(0.38,0.38,0). The observed results imply that the motion of the guest Gd ion interplays with the f electrons magnetoelastically and with carriers via Fermi surface nesting. The anomalous properties previously reported for this material far above T N originate from the strong electron-phonon coupling, which causes the motion of guest ions as precursors to the first-order phase transition.

AB - The motion of guest Gd ions in oversized boron cages in GdB 6 was investigated from phonon spectra measurements obtained by inelastic x-ray scattering. The measured phonon modes soften by about 10% from 300 K down to T N=16 K, in particular, the longitudinal phonon for the propagation vector q 1=(1/2,0,0) that characterizes the distorted structure below T N. Besides, the dispersion relation curves show kinklike anomalies at q k=(0.38,0.38,0). The observed results imply that the motion of the guest Gd ion interplays with the f electrons magnetoelastically and with carriers via Fermi surface nesting. The anomalous properties previously reported for this material far above T N originate from the strong electron-phonon coupling, which causes the motion of guest ions as precursors to the first-order phase transition.

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