Magnetic frustrations in the face centered cubic antiferromagnet NiS2
M. Matsuura, Y. Endoh, H. Hiraka, K. Yamada, K. Hirota, A. S. Mishchenko, N. Nagaosa, I. V. Solovyev
Abstract
Neutron scattering experiment on NiS2 single crystal revealed a honeycomb pattern of the intensity distribution in reciprocal lattice space (continuous-line structure along the fcc zone boundary) providing the first direct evidence for nearly frustrated antiferromagnetism (AF) on the face centered cubic (fcc) lattice. A small but finite lattice distortion below 30.9 K lifts the degeneracy of the magnetic ground state due to the frustration and eventually result in the coexistence of the type I and the type II AF long range orderings, which are mutually incompatible in the fcc symmetry at higher temperatures.
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