NDLI: Phase diagram of doped spin-Peierls systems

Content Provider	Springer Nature Link
Author	Fabrizio, M. Mélin, R. Souletie, J.
Copyright Year	1999
Abstract	The phase diagram of a model describing doped CuGeO3 is derived. The model emphasizes the role of local moments released by the impurities and randomly distributed inside the gaped singlet background. The phase diagram is investigated by two methods: (i) in a mean field treatment of the interchain coupling and (ii) in a real space decimation procedure in a two-dimensional model of randomly distributed moments. Both methods lead to similar results, in a qualitative agreement with experiments. In particular, a transition to an inhomogeneous Néel phase is obtained for arbitrary small doping. From the decimation procedure, we interpret this phase at very low doping as a Griffith antiferromagnet. Namely, it does not have a true long range order down to zero temperature. Nonetheless, large magnetically ordered clusters appear already at relatively high temperatures. This demonstrates the role of disorder in the theoretical description of doping in CuGeO3. A detailed comparison with other approaches is also given.
Starting Page	607
Ending Page	621
Page Count	15
File Format	PDF
ISSN	14346028
Journal	The European Physical Journal B
Volume Number	10
Issue Number	4
e-ISSN	14346036
Language	English
Publisher	EDP Sciences
Publisher Date	1999-08-01
Publisher Place	Les Ulis
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Condensed Matter Physics Physics Statistical Physics, Dynamical Systems and Complexity Fluid- and Aerodynamics Solid State Physics
Content Type	Text
Resource Type	Article
Subject	Electronic, Optical and Magnetic Materials Condensed Matter Physics

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4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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