Less than 50% sublattice polarization in an insulating S=3/2 kagome' antiferromagnet at low T

Abstract

We have found weak long range antiferromagnetic order in the quasi-two-dimensional insulating oxide $KC{r}_3(OD{)}_6(S{O}_4{)}_2$ 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 $g{\mu }_{B}S=3{\mu }_B$. 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.

18 pages, RevTex/Latex, with 6 figures

References in corpus (1)

• The Kagome Antiferromagnet with Defects: Satisfaction, Frustration, and Spin Folding in a Random Spin System

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