Unconventional spin freezing and fluctuations in the frustrated antiferromagnet NiGa2S4

D. E. MacLaughlin, S. Nakatsuji, Y. Nambu, K. Ishida, R. H. Heffner, Lei Shu, O. O. Bernal

Research output: Contribution to journalConference articlepeer-review

4 Citations (Scopus)

Abstract

Longitudinal-field muon spin rotation (LF-μSR) experiments in the two- dimensional geometrically-frustrated antiferromagnet NiGa2S4 reveal a number of features of spin freezing and dynamics in this system. Long-lived (correlation time 10-6 s at 2 K) disordered Ni spin freezing sets in abruptly below Tf = 8:5±0:5 K. At low temperatures slow Ni spin fluctuations are found in low applied field HL that are rapidly suppressed for HL and 0:04 T. Activated muon spin relaxation above Tf is strong evidence for 2D critical behaviour. The LF-μSR data indicate that NiGa2S4 is neither a conventional magnet nor a singlet spin liquid, and raise the question of how to reconcile the strongly field-dependent muon relaxation with the field-independent specific heat.

Original languageEnglish
Article number012040
JournalJournal of Physics: Conference Series
Volume145
Issue number1
DOIs
Publication statusPublished - 2009
Externally publishedYes
Event4th International Conference on Highly Frustrated Magnetism 2008, HFM 2008 - Braunschweig, Germany
Duration: 2008 Sep 72008 Sep 12

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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