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http://eprints.org/relation/isVersionOf http://eprints.iliauni.edu.ge/id/document/4011 http://eprints.org/relation/isVolatileVersionOf http://eprints.iliauni.edu.ge/id/document/4011 http://eprints.org/relation/ismediumThumbnailVersionOf http://eprints.iliauni.edu.ge/id/document/4011 4016 2 11146 document 4016 small.jpg image/png 056e7cdf251f49bce0cddd64c23c6043 MD5 1820 2014-02-08 15:15:35 http://eprints.iliauni.edu.ge/933/6/small.jpg 933 6 6 image/png other Thumbnails conversion from text to thumbnail_small ge public

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http://eprints.org/relation/isVersionOf http://eprints.iliauni.edu.ge/id/document/4011 http://eprints.org/relation/isVolatileVersionOf http://eprints.iliauni.edu.ge/id/document/4011 http://eprints.org/relation/issmallThumbnailVersionOf http://eprints.iliauni.edu.ge/id/document/4011 archive 34 disk0/00/00/09/33 2014-02-09 11:56:53 2016-06-30 12:31:29 2014-02-09 11:56:53 article show Avalishvili Nikoloz Japaridze G.I. gia_japaridze@iliauni.edu.ge pub QC fac_eng public We study the effect of leg dimerization on the ground-state magnetic phase diagram of a two-leg spin ladder with alternating rung exchange. We consider two possible patterns for dimmers distribution along the legs corresponding to the checkerboard and columnar structure. We study the system in the limit of strong rung exchange and magnetic field and. map the model onto the effective spin chain model and study the latter using the continuum-limit bosonization approach. We identified four quantum phase transitions and corresponding critical magnetic fields, which mark transitions from the spin gapped regimes into the gapless quantum spin-liquid regimes. In the gapped phases the magnetization curve of the system shows plateaus at magnetizations equal to zero, its saturation value and at . We show that in the case of checkerboard structure the intra-leg dimerization has no effect on the ground state properties of the system, while the columnar pattern leads to renormalization of the critical fields, in particular to extension of the gapped phases and respectively of the magnetization plateaus. 2012 Nano Studies 6 L. Chkhartishvili 85-92 FALSE 1987 - 8826