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- Title
Magnetic Properties of Defects in Spin-Gap Magnets.
- Authors
Smirnov, A. I.; Glazkov, V. N.; Sosin, S. S.
- Abstract
The magnetic properties of defects were studied in spin-gap magnets such as spin-Peierls magnet CuGeO[SUB3], Haldane magnet PbNi[SUB2]V[SUB2]O[SUB8], and charge-ordered ladder magnet NaV[SUB2]O[SUB5]. Doping of these systems with nonmagnetic impurities leads to additional magnetic degrees of freedom, which manifest themselves at low temperatures, where the intrinsic magnetic susceptibility of a spin-gap system is close to zero. Magnetic susceptibility appears due to the local destruction of the singlet ground state as a result of impurity-induced breakage of spin chains. Antiferromagnetically correlated areas arise near the spin-chain breaks. The sizes of these areas and the effective spin of these specific spin clusters are estimated. The order parameter and its spatially modulated depth are determined for impurity-induced magnetically ordered phases. The magnetic properties of defects for the NaV[SUB2]O[SUB5] ladder structure are explained in the model of electrons "hopping" near the chain break. The hopping degree of freedom effectively influences the total spin of a spin-chain fragment and magnetization of the system.
- Subjects
MAGNETIC properties; MAGNETS; MAGNETIZATION; ELECTRONS
- Publication
JETP Letters, 2003, Vol 77, Issue 8, p442
- ISSN
0021-3640
- Publication type
Article
- DOI
10.1134/1.1587181