Avalishvili, N and Japaridze, G.I. and Nozadze, D and Mahdavifar, S (2012) Magnetization plateau in the spin S=1/2 twoleg ladder with trimer modulation of the rungexchange. Bulletin of the Georgian National Academy of Sciences, 6 (2). pp. 5360. ISSN 01321447

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Abstract
The groundstate magnetic phase diagram of a twoleg spin ladder with trimerized modulated rung exchange is studied using the continuumlimit bosonization approach. In the limit where the rung exchange is dominant, the model is mapped onto the effective quantum sineGordon model with topological term. Six quantum phase transitions at different critical magnetic fields are identified. We have shown that the magnetization curve of the system exhibits two plateaus at magnetization equal to the 1/3 and 2/3 of the saturation value. The width of the plateaus, is proportional to the excitation gap at given magnetization and scales as , where is the amplitude of rungexchange modulation and the critical exponent is obtained as in the case of a ladder with antiferromagnetic legs and in the case of ladder with ferromagnetic legs.
Item Type:  Article 

Subjects:  Q Science > QC Physics 
Divisions:  Faculties/Schools > School of Natural Sciences and Engineering 
Depositing User:  გიორგი ჯაფარიძე 
Date Deposited:  09 Feb 2014 11:56 
Last Modified:  30 Jun 2016 12:32 
URI:  http://eprints.iliauni.edu.ge/id/eprint/934 
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