NMR study of pyrochlore lattice antiferromagnet, melanothallite Cu 2OCl2

Masahide Nishiyama, Akira Oyamada, Tetsuaki Itou, Satoru Maegawa, Hirotaka Okabe, Jun Akimitsu

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Abstract

The melanothallite Cu2OCl2 is a new example of pyrochlore-like antiferromagnet, which is composed of 3d transition metal electrons. We performed Cu- and Cl-NMR experiments on powder samples of Cu 2OCl2 below transition temperature TN = 70 K and we observed six resonant peaks of Cu nuclei, which are composed of three symmetric peaks corresponding to 63Cu and three corresponding to 65Cu. The Cu nuclei feel the strong hyperfine fields because of ordered magnetic moments and the electric field gradients. We determined the spin structure by analyzing the Cu-NMR spectra. The melanothallite has an all-in-all-out spin structure. The spin lattice relaxation rates T 1 -1 of Cu- and Cl-NMR in the ordered phase are proportional to the temperature; This suggests that although long-range ordering occurs at rather high temperature, the large spin fluctuations caused by the geometrical frustration still remain.

Original languageEnglish
Article number012030
JournalJournal of Physics: Conference Series
Volume320
DOIs
Publication statusPublished - 2011
Externally publishedYes

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nuclear magnetic resonance
nuclei
frustration
spin-lattice relaxation
magnetic moments
transition metals
transition temperature
gradients
electric fields
electrons
temperature

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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NMR study of pyrochlore lattice antiferromagnet, melanothallite Cu 2OCl2 . / Nishiyama, Masahide; Oyamada, Akira; Itou, Tetsuaki; Maegawa, Satoru; Okabe, Hirotaka; Akimitsu, Jun.

In: Journal of Physics: Conference Series, Vol. 320, 012030, 2011.

Research output: Contribution to journalArticle

Nishiyama, Masahide ; Oyamada, Akira ; Itou, Tetsuaki ; Maegawa, Satoru ; Okabe, Hirotaka ; Akimitsu, Jun. / NMR study of pyrochlore lattice antiferromagnet, melanothallite Cu 2OCl2 . In: Journal of Physics: Conference Series. 2011 ; Vol. 320.
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