Study on the Geometrically-frustrated Magnet Ni1/2Fe1/2Ga2S4

Title
Study on the Geometrically-frustrated Magnet Ni1/2Fe1/2Ga2S4
Authors
명보라김철성김삼진오영제
Keywords
Spin-lattice; Antiferromagnetic; Spin-freezing transition; Mossbauer spectroscopy; spin-spin correlation
Issue Date
2011-02
Publisher
Journal of the Korean Physical Society
Citation
VOL 58, NO 2, 252-255
Abstract
We have investigated the spin-lattice relation in geometrical frustration by using an X-ray diffractometer (XRD), a superconducting quantum interference device (SQUID) magnetometer, and a M¨ossbauer spectroscopy. The crystal structure of the Ni1/2Fe1/2Ga2S4 studied here, was determined to be a 2-D triangular lattice structure of P-3m1 with lattice parameters of a0 = 3.650 Å, and c0 = 12.040 Å. From the temperature dependence of the molar susceptibility in an applied high field of H = 5 T measured by using a SQUID magnetometer, Ni1/2Fe1/2Ga2S4 had a strongly antiferromagnetic behavior due to the Curie-Weiss temperature θW = -71.6 K. The freezing temperature at the onset of the spin-freezing transition was Tf = 10.0 K under a low field of H = 100 Oe, similar to a spin glass system, and the frustration parameter was f (; θW; /TN) = 3.25. From the M¨ossbauer spectrum at 4.2 K, we noticed a severely distorted 8-line shape coming from spin fluctuations and an incommensurate spin structure. The freezing temperature (Tf = 10 K) related to the electric spin disorder was different from the N´eel temperature (TN = 22 K) influenced by microscopic disorder of the nuclear spin due to a strained spin caused by the distorted lattice from geometrical frustration, as indicated in the M¨ossbauer spectra.
URI
http://pubs.kist.re.kr/handle/201004/39524
ISSN
0374-4884
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