Long Range Antiferromagnetic Ordering Observed Below 20 mK in the Heavy Fermion Superconductor UPt3

Yoshihiro Koike, Naoto Metoki, Etsuji Yamamoto, Yoshinori Haga, Yoshichika Ōnuki, Noriaki Kimura, Yoshichika Ōnuki, Kunihiko Maezawa

Research output: Contribution to journalArticle

24 Citations (Scopus)

Abstract

Ultralow-temperature neutron scattering experiments have been carried out in order to study the antiferromagnetic ordering in the heavy fermion superconductor UPt3. We observed the (0.5 0 1) antiferromagnetic peak below 5 K. We found a finite spin correlation length of about 300 Å above 50 mK. The peak intensity increases linearly with decreasing temperature, and is suppressed below the superconducting transition temperature of about 0.56 K. The moment size of 0.04 µB/U was estimated from the peak intensity. These behaviors are in full agreement with results of previous studies. Surprisingly, the antiferromagnetic peak exhibits considerable narrowing below 50 mK, and a resolution-limited peak is observed below 20 mK. This is direct evidence that the antiferromagnetic long-range ordering is realized in UPt3 at ultralow temperatures.

Original languageEnglish
Pages (from-to)1142-1145
Number of pages4
Journaljournal of the physical society of japan
Volume67
Issue number4
DOIs
Publication statusPublished - 1998

Keywords

  • UPt
  • antiferromagmetic ordering
  • heavy fermion superconductor
  • neutron scattering

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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