Disorder effects in the quantum kagome antiferromagnetZnCu3(OH)6Cl2

Autor:	R. Chitra, M. J. Rozenberg
Rok vydání:	2008
Předmět:	Oxygen-17 Materials science Condensed matter physics Lattice (order) Antiferromagnetism Condensed Matter::Strongly Correlated Electrons Condensed Matter Physics Quantum Nmr data Electronic Optical and Magnetic Materials
Zdroj:	Physical Review B. 78
ISSN:	1550-235X 1098-0121
DOI:	10.1103/physrevb.78.132406
Popis:	The recent NMR experiments on ZnCu3(OH)6Cl2 motivate our study of the effect of non- magnetic defects on the antiferromagnetic spin-1/2 kagome lattice. We use exact diagonalization methods to study the effect of two such defects on finite size systems. Our results, obtained without adjustable parameters, are in good quantitative agreement with recent Oxygen 17 NMR data. They provide support for the experimental interpretation of the presence of defects within the kagome layers due to Zn/Cu substitutions. Our results also show that disorder effects become relevant at lower temperatures, raising questions about the experimental evidence for the absence of an intrinsic spin gap in the kagome 2D layers.
Databáze:	OpenAIRE
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