Magnetic excitations in heavy-fermion superconductor PrOs 4Sb12

Keitaro Kuwahara, Kazuaki Iwasa, Masahumi Kohgi, Koji Kaneko, Shingo Araki, Naoto Metoki, Hitoshi Sugawara, Yuji Aoki, Hideyuki Sato

Research output: Contribution to journalArticle

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Abstract

Magnetic excitations in a single crystal of heavy-fermion superconductor PrOs4Sb12 have been studied by inelastic neutron scattering (INS) at low temperatures under high magnetic fields. The crystal field (CF) excitations at 0.7 meV observed in a previous INS study of a polycrystal sample were confirmed in this study on a single crystal. The observed excitations in the zero magnetic field soften around a wave vector (1,0,0), which is the modulation vector of the field-induced antiferro-quadrupolar ordering, suggesting the presence of quadrupolar instability. The observed field dependence of excitations is better reproduced in a singlet ground-state model rather than in a non-Kramers doublet ground-state model. In a high resolution experiment, furthermore, the change of the excitation spectra at (1,0,0) was observed on passing through the superconducting transition temperature, indicating that the excitation and the superconductivity are closely related in PrOs4Sb12.

Original languageEnglish
Pages (from-to)1438-1441
Number of pages4
JournalJournal of the Physical Society of Japan
Volume73
Issue number6
DOIs
Publication statusPublished - Jun 2004
Externally publishedYes

Fingerprint

heavy fermion superconductors
excitation
inelastic scattering
neutron scattering
ground state
single crystals
polycrystals
magnetic fields
crystal field theory
superconductivity
transition temperature
modulation
high resolution

Keywords

  • Crystal field
  • Inelastic neutron scattering
  • PrOsSb
  • Superconductivity

ASJC Scopus subject areas

  • Physics and Astronomy(all)

Cite this

Kuwahara, K., Iwasa, K., Kohgi, M., Kaneko, K., Araki, S., Metoki, N., ... Sato, H. (2004). Magnetic excitations in heavy-fermion superconductor PrOs 4Sb12. Journal of the Physical Society of Japan, 73(6), 1438-1441. https://doi.org/10.1143/JPSJ.73.1438

Magnetic excitations in heavy-fermion superconductor PrOs 4Sb12. / Kuwahara, Keitaro; Iwasa, Kazuaki; Kohgi, Masahumi; Kaneko, Koji; Araki, Shingo; Metoki, Naoto; Sugawara, Hitoshi; Aoki, Yuji; Sato, Hideyuki.

In: Journal of the Physical Society of Japan, Vol. 73, No. 6, 06.2004, p. 1438-1441.

Research output: Contribution to journalArticle

Kuwahara, K, Iwasa, K, Kohgi, M, Kaneko, K, Araki, S, Metoki, N, Sugawara, H, Aoki, Y & Sato, H 2004, 'Magnetic excitations in heavy-fermion superconductor PrOs 4Sb12', Journal of the Physical Society of Japan, vol. 73, no. 6, pp. 1438-1441. https://doi.org/10.1143/JPSJ.73.1438
Kuwahara, Keitaro ; Iwasa, Kazuaki ; Kohgi, Masahumi ; Kaneko, Koji ; Araki, Shingo ; Metoki, Naoto ; Sugawara, Hitoshi ; Aoki, Yuji ; Sato, Hideyuki. / Magnetic excitations in heavy-fermion superconductor PrOs 4Sb12. In: Journal of the Physical Society of Japan. 2004 ; Vol. 73, No. 6. pp. 1438-1441.
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AU - Kohgi, Masahumi

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AU - Araki, Shingo

AU - Metoki, Naoto

AU - Sugawara, Hitoshi

AU - Aoki, Yuji

AU - Sato, Hideyuki

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N2 - Magnetic excitations in a single crystal of heavy-fermion superconductor PrOs4Sb12 have been studied by inelastic neutron scattering (INS) at low temperatures under high magnetic fields. The crystal field (CF) excitations at 0.7 meV observed in a previous INS study of a polycrystal sample were confirmed in this study on a single crystal. The observed excitations in the zero magnetic field soften around a wave vector (1,0,0), which is the modulation vector of the field-induced antiferro-quadrupolar ordering, suggesting the presence of quadrupolar instability. The observed field dependence of excitations is better reproduced in a singlet ground-state model rather than in a non-Kramers doublet ground-state model. In a high resolution experiment, furthermore, the change of the excitation spectra at (1,0,0) was observed on passing through the superconducting transition temperature, indicating that the excitation and the superconductivity are closely related in PrOs4Sb12.

AB - Magnetic excitations in a single crystal of heavy-fermion superconductor PrOs4Sb12 have been studied by inelastic neutron scattering (INS) at low temperatures under high magnetic fields. The crystal field (CF) excitations at 0.7 meV observed in a previous INS study of a polycrystal sample were confirmed in this study on a single crystal. The observed excitations in the zero magnetic field soften around a wave vector (1,0,0), which is the modulation vector of the field-induced antiferro-quadrupolar ordering, suggesting the presence of quadrupolar instability. The observed field dependence of excitations is better reproduced in a singlet ground-state model rather than in a non-Kramers doublet ground-state model. In a high resolution experiment, furthermore, the change of the excitation spectra at (1,0,0) was observed on passing through the superconducting transition temperature, indicating that the excitation and the superconductivity are closely related in PrOs4Sb12.

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