When a theoretical model is realized in nature, small perturbation terms play important roles in the selection of the ground state in geometrically frustrated magnets. In case of a triangular spin tube, the two-dimensional network of the inter-tube interaction forms characteristic lattices. Among them Kagome-Triangular (KT) lattice is known to exhibit an enriched phase diagram including various types of non-trivial structures: non-coplanar cuboc structure, coplanar 120°structure with the two-dimensional propagation vector of k 2D = (0, 0), ffiffi ffi 3 p ffiffi ffi 3 p structure with k 2D = (1/3, 1/3), and incommensurate structure. We investigate the magnetic state in the model material CsCrF 4 by using neutron diffraction technique. Combination of representation analysis and Rietveld refinement reveals that a very rare structure, i.e., a quasi-120°structure with k 2D = (1/2, 0), is realized at the base temperature. The classical calculation of the phase diagram elucidates that CsCrF 4 is the first experimental realization of the KT lattice having ferromagnetic Kagome bond. A single-ion anisotropy and Dzyaloshinskii-Moriya interaction play key roles in the selection of the ground state. Furthermore, a successive phase transition having an intermediate state represented by k 2D = (1/3, 1/3) is observed. The intermediate state is a partially ordered 120°structure which is induced by thermal fluctuation.
We have studied the pressure-induced quantum phase transition in the singlet-ground-state antiferromagnet CsFeCl 3 . Neutron diffraction experiments under pressure evidence the magnetic long-range order at low temperatures. Magnetic structure analysis reveals a 120 • structure with a propagation vector of k mag = (1/3,1/3,0). The estimated critical exponent of the order parameter suggests that CsFeCl 3 belongs to the universality class of U (1) × Z 2 symmetry which is expected to realize the chiral liquid state.
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