Ordering due to quantum fluctuations in Sr2Cu3O4Cl2
Journal
Physical Review Letters
Journal Volume
83
Journal Issue
4
Pages
852-855
Date Issued
1999
Author(s)
Kim, Y. J.
Aharony, A.
Birgeneau, R. J.
Entin-Wohlman, O.
Erwin, R. W.
Greven, M.
Harris, A. B.
Kastner, M. A.
Korenblit, I. Y.
Lee, Y. S.
Shirane, G.
Abstract
Sr2Cu3O4Cl2 has CuI and CuII subsystems, forming interpenetrating S=1/2 square lattice Heisenberg antiferromagnets. The classical ground state is degenerate, due to frustration of the intersubsystem interactions. Magnetic neutron scattering experiments show that quantum fluctuations cause a two dimensional Ising ordering of the CuII’s, lifting the degeneracy, and a dramatic increase of the CuI out-of-plane spin-wave gap, unique for order out of disorder. The spin-wave energies are quantitatively predicted by calculations which include quantum fluctuations. © 1999 The American Physical Society.
Type
journal article