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Magnetic frustrations in the face centered cubic antiferromagnet NiS2

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arxiv cond-mat/0104233 v2 pith:QT5FSV4M submitted 2001-04-12 cond-mat.str-el

classification cond-mat.str-el
keywords latticecenteredcubicfacemagneticnis2typealong
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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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