Neutron-scattering measurement of incommensurate short-range order in single crystals of the S=1 triangular antiferromagnet NiGa2S 4

C. Stock, S. Jonas, C. Broholm, S. Nakatsuji, Y. Nambu, K. Onuma, Y. Maeno, Jaiho Chung

Research output: Contribution to journalArticle

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Abstract

Neutron scattering is used to investigate spin correlations in ultrapure single crystals of the S=1 triangular lattice NiGa2S4. Despite a Curie-Weiss temperature of ΘCW=-80(2)K, static (τ>1ns) short-range (ξab=26(3)Å) incommensurate order prevails for T>1.5K. The incommensurate modulation Q0=(0.155(3),0.155(3),0), ΘCW, and the spin-wave velocity (c=4400m/s) can be accounted for by antiferromagnetic third-nearest-neighbor interactions J3=2.8(6)meV and ferromagnetic nearest-neighbor coupling J1=-0.35(9) J3. Interplane correlations are limited to nearest neighbors and weakened by an in-plane field. These observations show that the short-range ordered glassy phase that has been observed in a number of highly degenerate systems can persist near the clean limit.

Original languageEnglish
Article number037402
JournalPhysical Review Letters
Volume105
Issue number3
DOIs
Publication statusPublished - 2010 Jul 16
Externally publishedYes

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neutron scattering
single crystals
magnons
modulation
interactions
temperature

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Neutron-scattering measurement of incommensurate short-range order in single crystals of the S=1 triangular antiferromagnet NiGa2S 4 . / Stock, C.; Jonas, S.; Broholm, C.; Nakatsuji, S.; Nambu, Y.; Onuma, K.; Maeno, Y.; Chung, Jaiho.

In: Physical Review Letters, Vol. 105, No. 3, 037402, 16.07.2010.

Research output: Contribution to journalArticle

Stock, C. ; Jonas, S. ; Broholm, C. ; Nakatsuji, S. ; Nambu, Y. ; Onuma, K. ; Maeno, Y. ; Chung, Jaiho. / Neutron-scattering measurement of incommensurate short-range order in single crystals of the S=1 triangular antiferromagnet NiGa2S 4 In: Physical Review Letters. 2010 ; Vol. 105, No. 3.
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AU - Nakatsuji, S.

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AU - Onuma, K.

AU - Maeno, Y.

AU - Chung, Jaiho

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