By Topic

Spin-Disorder and Non-Degenerate Energy States in Geometrically Frustrated Materials

Sign In

Cookies must be enabled to login.After enabling cookies , please use refresh or reload or ctrl+f5 on the browser for the login options.

Formats Non-Member Member
$31 $13
Learn how you can qualify for the best price for this item!
Become an IEEE Member or Subscribe to
IEEE Xplore for exclusive pricing!
close button

puzzle piece

IEEE membership options for an individual and IEEE Xplore subscriptions for an organization offer the most affordable access to essential journal articles, conference papers, standards, eBooks, and eLearning courses.

Learn more about:

IEEE membership

IEEE Xplore subscriptions

6 Author(s)
Myoung, Bo Ra ; Dept. of Phys., Kookmin Univ., Seoul, South Korea ; Woo Jun Kwon ; Kim, Sam Jin ; Yong-Woo Lee
more authors

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. HC 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 Tf. The specific heat (CP/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 CP 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 5T2g and 5E2g, and 5T2g 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.

Published in:

Magnetics, IEEE Transactions on  (Volume:48 ,  Issue: 4 )