Incommensurability and Domain Structure of K2SbF5

A. M. Panich, L. A. Zemnukhova, R. L. Davidovich

Research output: Contribution to journalArticlepeer-review

Abstract

Phase transitions and incommensurability in K2SbF5 have been studied by means of 123Sb NQR spectra and spin-lattice relaxation measurements. The phase transitions occur at 117, 135 and 260 K. The line shape and temperature dependence of the spin-lattice relaxation time T1 at 135 to 260 K are characteristic for an incommensurate state with a plane wave modulation regime. At 117 to 135 K a distinct fine structure of the NQR spectra has been observed. The X-ray diffraction pattern of this phase is interpreted as a coexistence of two modulation waves along the a and b axis with wave vectors (a*/6 + b*/6) and (a*/2 + b*/2), respectively. The best interpretation that fits our NQR data is a coexistence of two domains, the structures of which are modulated with different periods in such a manner that each domain exhibits only one of the aforementioned modulation waves. Redistribution of line intensities with the variation of temperature shows that one of the domains becomes energetically preferable on cooling and is transformed into the low temperature phase at 117 K. The 123Sb NQR measurements in K2SbF5 show unusually short values of T1, which become close to the spin-spin relaxation time T2 with increasing temperature. - Pacs: 61.44.Fw, 64.60, 64.70, 64.70.Rh, 76.60.

Original languageEnglish
Pages (from-to)456-460
Number of pages5
JournalZeitschrift fur Naturforschung - Section A Journal of Physical Sciences
Volume57
Issue number6-7
DOIs
StatePublished - 1 Jan 2002

Keywords

  • Domain Structure
  • Incommensurate Phases
  • NQR
  • Phase Transitions

ASJC Scopus subject areas

  • Mathematical Physics
  • General Physics and Astronomy
  • Physical and Theoretical Chemistry

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