Anomalous Metallic State Coexisting with the Charge Density Wave in Rb3Cu8S6 Studied by NMR and Spin Echo Double Resonance (SEDOR)

Atsushi Goto, Tadashi Shimizu, Hayuyoshi Aoki, Masahiko Isobe, Yutaka Ueda

Research output: Contribution to journalArticle

Abstract

The metallic state below the charge density wave (CDW) transition temperature of Rb3Cu8S6 has been studied by NMR and spin echo double resonance (SEDOR). This compound is known to show metallic characteristics below Tc2=55 K, although the CDW already sets in at Tc1=120 K. It has been found that some of the Cu-NMR lines start to spread out below Tc1, and remain broadened even below Tc2. In order to gain further insight into the state below Tc2, we applied SEDOR to the broadened Cu-lines below Tc2. A double-horned shape characteristic of CDW states was found in one of the SEDOR spectra, which is considered to be a manifestation of the presence of the CDW even below Tc2. The SEDOR reduction is attributed to a kind of motion in the CDW chains. On the other hand, the spin-lattice relaxation rate at the Rb sites was found to decrease rapidly below Tc2, implying that the Rb sites are not inert, but play important roles in this metallic state. As a possible mechanism for this anomalous metallic state, the spinless (charged)-soliton conduction on the CDW chains is discussed.

Original languageEnglish
Pages (from-to)1560-1563
Number of pages4
Journaljournal of the physical society of japan
Volume67
Issue number5
DOIs
Publication statusPublished - 1998 Jan 1

Keywords

  • Charge density wave
  • NMR
  • RbCuS
  • Spin echo double resonance

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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