Document Detail


Softened magnetic excitations in the s = 3/2 distorted triangular antiferromagnet α-CaCr(2)O(4).
MedLine Citation:
PMID:  23041837     Owner:  NLM     Status:  In-Data-Review    
Abstract/OtherAbstract:
The spin dynamics and magnetic excitations of the slightly distorted triangular s = 3/2 system α-CaCr (2)O (4) are investigated by means of Raman spectroscopy and electron spin resonance (ESR) to elucidate its peculiar magnetic properties. Two-magnon excitations in circular RL symmetry show a multi-maximum structure with a dominant spectral weight at low energies. The temperature dependence of the ESR linewidth is described by a critical broadening ΔH(pp)(T) ∝ (T-T(N ))(-p) with the exponent p = 0.38(5) - 0.48(3) for temperatures above T(N) = 42.6 K. The exponent is much smaller than that of other s = 3/2 triangular lattices. This is ascribed to soft roton-like modes, indicative of the instability of a helical 120° phase. As an origin we discuss a complex spin topology formed by four inequivalent nearest neighbor and sizable next-nearest neighbor interactions.
Authors:
Dirk Wulferding; Kwang-Yong Choi; Peter Lemmens; Alexey N Ponomaryov; Johan van Tol; A T M Nazmul Islam; Sandor Toth; Bella Lake
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Publication Detail:
Type:  Journal Article     Date:  2012-10-08
Journal Detail:
Title:  Journal of physics. Condensed matter : an Institute of Physics journal     Volume:  24     ISSN:  1361-648X     ISO Abbreviation:  J Phys Condens Matter     Publication Date:  2012 Oct 
Date Detail:
Created Date:  2012-10-09     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  101165248     Medline TA:  J Phys Condens Matter     Country:  England    
Other Details:
Languages:  eng     Pagination:  435604     Citation Subset:  IM    
Affiliation:
Institute for Condensed Matter Physics, Technical University of Braunschweig, Mendelssohnstraße 3, D-38106 Braunschweig, Germany.
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