Evidence for crossover effects in the spin dynamics of the two-dimensional antiferromagnet Sr{sub 2}CuO{sub 2}Cl{sub 2} from {sup 35}Cl nuclear magnetic resonance
- Ames Laboratory and Department of Physics and Astronomy, Iowa State University, Ames, Iowa 50011 (United States)
- INFM-Dipartimento di Fisica A. Volta, Universita di Pavia, I-27100 Pavia (Italy)
{sup 35}Cl nuclear magnetic resonance (NMR) and relaxation measurements have been performed in stacked Sr{sub 2}CuO{sub 2}Cl{sub 2} single crystals with N{acute e}el temperature {ital T}{sub {ital N}}=257 K for two crystal orientations with respect to the applied field: {bold H}{parallel}{bold c} and {bold H}{perpendicular}{bold c}. All the parameters of {sup 35}Cl NMR are found to exhibit a strong orientation dependence varying in temperature. In particular, the unconventional anisotropy and strong temperature dependence of the {sup 35}Cl nuclear spin{endash}spin relaxation rate, {ital T}{sup {minus}1}{sub 2}, are presented and discussed in terms of a crossover of the Cu{sup 2+} spin dynamics from Heisenberg to {ital XY}-like correlation for {ital T}{r_arrow}{ital T}{sup +}{sub {ital N}}. The onset of anisotropic broadening and shift of the {sup 35}Cl NMR line was observed well above {ital T}{sub {ital N}}, which is in agreement with the previous results. {copyright} {ital 1996 American Institute of Physics.}
- Research Organization:
- Ames National Laboratory
- DOE Contract Number:
- W-7405-ENG-82
- OSTI ID:
- 280031
- Report Number(s):
- CONF-951101--
- Journal Information:
- Journal of Applied Physics, Journal Name: Journal of Applied Physics Journal Issue: 8 Vol. 79; ISSN JAPIAU; ISSN 0021-8979
- Country of Publication:
- United States
- Language:
- English
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