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 KCr3(OD)6(SO4)2 which contains Cr3+ S=3/2 ions on a kagom\'e lattice. In a sample with ≈ 76% occupancy of the chromium sites the ordered moment is 1.1(3)μB per chromium ion which is only one third of the N\'eel value gμBS=3μB. The magnetic unit cell equals the chemical unit cell, a situation which is favored by inter-plane interactions. Gapless quantum spin-fluctuations (/kB <0.25K) with a bandwidth of 60K >> TN = 1.6K are the dominant contribution to the spin correlation function, S(Q,ω) in the ordered phase.
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