Low-Energy Magnetic Excitations in the Antiferromagnetically Ordered State of an Incipient Heavy-Electron Compound UP as Studied by 31P NMR

Shigeru Takagi

Research output: Contribution to journalArticlepeer-review

Abstract

The microscopic magnetic properties of UP with the cubic NaCl-type structure have been investigated by 31P NMR in the magnetically ordered state. 1 /T1 is extraordinarily large in the single-g type-I phase (T0 ≅& 22.5 K< T< TN≅ 122 K), and shows about two orders of magnitude abrupt decrease through the single-Q ↔ double-Q phase transition at T0. Below about 4K in the double-Q type-I phase (T<T0), 1/T1 shows a Korringa-like temperature-dependence, which corresponds qualitatively to a 5f-derived γ term in the specific heat. We discuss this behavior as a clear indication of the existence of 5f-derived very-low-energy magnetic excitations even in the ordered state, and an incipient heavy-electron character of the compound is concluded. We also present a simple qualitative model of a system of exchange-coupled Kondo impurities under internal exchange (or molecular) field in order to discuss the origin of these excitations.

Original languageEnglish
Pages (from-to)4604-4611
Number of pages8
Journaljournal of the physical society of japan
Volume63
Issue number12
DOIs
Publication statusPublished - 1994 Jan 1

Keywords

  • NMR
  • UP
  • heavy electron
  • low-energy magnetic excitation
  • nuclear magnetic relaxation

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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