Publications in Scientific Journals:
S. Toth, B. Lake, K. Hradil, T. Guidi, K. Rule, M. Stone, A. Islam:
"Magnetic soft modes in the distorted triangular antiferromagnetet alpha-CaCr2O4";
Physical Review Letters,
109
(2012),
12;
127203-1
- 127203-5.
English abstract:
In this Letter, we explore the phase diagram and excitations of a distorted triangular lattice antiferromagnet. The unique two-dimensional distortion considered here is very different from the "isosceles"-type distortion that has been extensively investigated. We show that it is able to stabilize a 120° spin structure for a large range of exchange interaction values, while new structures are found for extreme distortions. A physical realization of this model is α-CaCr2O4, which has a 120° structure but lies very close to the phase boundary. This is verified by inelastic neutron scattering which reveals unusual rotonlike minima at reciprocal space points different from those corresponding to the magnetic order.
Keywords:
75.30.Et, 61.05.F-, 75.10.Hk, 75.30.Ds
"Official" electronic version of the publication (accessed through its Digital Object Identifier - DOI)
http://dx.doi.org/10.1103/PhysRevLett.109.127203
Created from the Publication Database of the Vienna University of Technology.