Anomalous kondo effect and ordered state in heavy fermion system SmOs 4Sb12: Resistivity, Sb-NQR, and magnetization measurements under high pressure

Hisashi Kotegawa, Keisuke Tabira, Yuta Irie, Hiroyuki Hidaka, Tatsuo Kobayashi, Daisuke Kikuchi, Kenya Tanaka, Sho Tatsuoka, Hitoshi Sugawara, Hideyuki Sato

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Abstract

We report resistivity, nuclear quadrupole resonance (NQR), and magnetization measurements under high pressures in a novel heavy fermion compounds SmOs4Sb12. The resistivity and nuclear spin-lattice relaxation rate 1/T1 show the coherent behavior below a characteristic temperature T* = 20 25 K at ambient pressure. Nuclear spin-spin relaxation rate 1/T2 was found to show a peak of electrical origin around T*. Some charge fluctuation is considered to play an important role in the Kondo effect of SmOs4Sb12. On the other hand, the magnetization at low temperature does not increase under pressures, although the transition temperature increases. The NQR signals are strongly suppressed around the transition temperature and vanishes at low temperatures. These suggest that the ordered state in SmOs4Sb 12 is not simple ferromagnetism.

Original languageEnglish
Pages (from-to)90-95
Number of pages6
JournalJournal of the Physical Society of Japan
Volume77
Issue numberSUPPL.A
Publication statusPublished - 2008

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Keywords

  • Kondo effect
  • Magnetization
  • NQR
  • Pressure effect
  • Skutterudite

ASJC Scopus subject areas

  • Physics and Astronomy(all)

Cite this

Kotegawa, H., Tabira, K., Irie, Y., Hidaka, H., Kobayashi, T., Kikuchi, D., Tanaka, K., Tatsuoka, S., Sugawara, H., & Sato, H. (2008). Anomalous kondo effect and ordered state in heavy fermion system SmOs 4Sb12: Resistivity, Sb-NQR, and magnetization measurements under high pressure. Journal of the Physical Society of Japan, 77(SUPPL.A), 90-95.