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

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

1997-05-01

arxiv.org/abs/cond-mat/9705014v1

Physics

Condensed Matter

Strongly Correlated Electrons

18 pages, RevTex/Latex, with 6 figures

Scientific paper

10.1103/PhysRevB.56.8091

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 kagom\'{e} 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 N\'{e}el value $g\mu_BS=3\mu_B$. 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.

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