Date of this Version
Physical Review Letters
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.
Kim, Y., Aharony, A., Birgeneau, R. J., Chou, F., Entin-Wohlman, O., Erwin, R. W., Greven, M., Harris, A., Kastner, M. A., Korenblit, I., Lee, Y., & Shirane, G. (1999). Ordering Due to Quantum Fluctuations in Sr2Cu3O4Cl2. Physical Review Letters, 83 (4), 852-855. http://dx.doi.org/10.1103/PhysRevLett.83.852
Date Posted: 20 August 2015
This document has been peer reviewed.