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24 April 2024

» arxiv » cond-mat/9705014

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Less than 50% sublattice polarization in an insulating S=3/2 kagome' antiferromagnet at low T
S.-H. Lee ; C. Broholm ; M. F. Collins ; L. Heller ; A. P. Ramirez ; C. Kloc ; E. Bucher ; R. W. Erwin ; N. Lacevic ;
Date:	2 May 1997
Subject:	Strongly Correlated Electrons \| cond-mat.str-el
Abstract:	We have found weak long range antiferromagnetic order in the quasi-two-dimensional insulating oxide $ KCr_3(OD)_6(SO_4)_2$ which contains Cr$^{3+}$ S=3/2 ions on a kagomé lattice. In a sample with $approx$ 76% occupancy of the chromium sites the ordered moment is 1.1(3)$mu_B$ per chromium ion which is only one third of the Néel value $gmu_BS=3mu_B$. The magnetic unit cell equals the chemical unit cell, a situation which is favored by inter-plane interactions. Gapless quantum spin-fluctuations ($Delta/k_B <0.25$K) with a bandwidth of 60K >> $T_N$ = 1.6K are the dominant contribution to the spin correlation function, $S(Q,omega)$ in the ordered phase.
Source:	arXiv, cond-mat/9705014
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