Quantum Impurities in the Two-Dimensional Spin One-Half Heisenberg Antiferromagnet
O. P. Vajk,1
P. K. Mang,2
M. Greven,23*
P. M. Gehring,4
J. W. Lynn4
The study of randomness in low-dimensional quantum antiferromagnets
is at the forefront of research in the field of strongly correlated
electron systems, yet there have been relatively few experimental model
systems. Complementary neutron scattering and numerical experiments
demonstrate that the spin-diluted Heisenberg antiferromagnet
La2Cu1-z(Zn,Mg)zO4
is an excellent model material for square-lattice site percolation in
the extreme quantum limit of spin one-half. Measurements of the ordered
moment and spin correlations provide important quantitative information
for tests of theories for this complex quantum-impurity problem.
1 Department of Physics,
2 Department of Applied Physics, Stanford
University, Stanford, CA 94309, USA.
3 Stanford
Synchrotron Radiation Laboratory, Stanford, CA 94305, USA.
4 NIST Center for Neutron Research, National
Institute of Standards and Technology, Gaithersburg, MD 20899, USA.
*
To whom correspondence should be addressed. E-mail:
greven{at}stanford.edu
