Successive Phase Transitions in CsNiBr_3 Observed by ^<133>Cs NMR Including Critical Examination of the Local Field

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The ordering process in the Ising-like Heisenberg antiferromagnet on the hexagonal lattice has been studied through the "'Cs NMR in CsNiBr.. The observed localfield at "'Cs was 3.5 times as large as the calculated field from the point dipoles at theNi" sites. The limited applicability of the conventional point dipole model has beenovercome by treating the symmetry property at the "'Cs site. Under the applied fieldof 4.6 T, we have found that the Ni" spin component parallel to the c-axis ordersbelow T., = 15.0 K, whereas the perpendicular component orders below T..= 12.5 Kto form the triangular three-sublattices in the c-plane: one spin is parallel to the c-axisand the other two are canted 'l- 38' from the c-axis. 'the comparison is made with theexisting data of CsNiC1. with an emphasis on the dynamical behavior of thetriangular spin arrangement.[CsNiBr3, successive phase transitions, triangular lattice antiferromagnet, frustra- l1 tion, NMRI
社団法人日本物理学会の論文
1992-05-15