Spin-Disorder and Non-Degenerate Energy States in Geometrically Frustrated Materials
SCIE
SCOPUS
- Title
- Spin-Disorder and Non-Degenerate Energy States in Geometrically Frustrated Materials
- Authors
- Myoung, BR; Kwon, WJ; Kim, SJ; Lee, YW; Jeong Yoon Hee; Kim, CS
- Date Issued
- 2012-04
- Publisher
- IEEE
- Abstract
- We have studied chalcogenide Ni1-xFexGa2S4, showing geometrical frustration effect. M-H curves at 4.2 K reveal that the disordered spins cannot be rotated completely along the direction of high external field of 5 T, since these spins are strongly constrained in the triangular lattice. H-C increases with increasing Fe concentration, being consistent with the enhanced antiferromagnetic (AFM) spin-spin interactions and the suppressed spin-fluctuation due to the increase in freezing temperature T-f. The specific heat (C-p/T) measurement do not show any phase transformation between 2 and 160 K and there is no clear indication of gap in the temperature dependent C-p curve between 0 and 7 T, because the atomic short-range ordering of the strained spin in the geometrically frustrated triangular lattice exists at low temperature. Though typical geometrically frustrated magnet shows degeneracy, Mossbauer analysis at 4.2 K shows that 5D of 3d orbit in the samples studied here is splitted into T-5(2g) and E-5(2g), and T-5(2g) is further splitted into singlet and doublet by large electric quadrupole splitting. This suggests that Fe2+ ionic state has no absolute degenerate energy states in all samples due to Jahn-Teller effect.
- URI
- https://oasis.postech.ac.kr/handle/2014.oak/15580
- DOI
- 10.1109/TMAG.2011.2173319
- ISSN
- 0018-9464
- Article Type
- Article
- Citation
- IEEE TRANSACTIONS ON MAGNETICS, vol. 48, no. 4, page. 1301 - 1304, 2012-04
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