Ordering Due to Quantum Fluctuations in Sr2Cu3O4Cl2

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Department of Physics Papers
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Physics
Quantum Physics
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Kim, Youngjune
Aharony, Amnon
Birgeneau, Robert J
Chou, Fangcheng
Entin-Wohlman, Ora
Erwin, Ross W
Greven, Martin
Kastner, Marc A
Korenblit, I. Ya
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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.

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1999-07-26
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Physical Review Letters
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