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Stability of commensurate phases near the critical temperature: A renormalization-group calculation

Physical Review B, ISSN: 0163-1829, Vol: 23, Issue: 9, Page: 4770-4772
1981
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  • Citations
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Article Description

The phase diagram of a modulated system in a field which changes the periodicity is investigated near the critical temperature. For certain values of the field, the system can gain energy by locking into phases where the wave vector is commensurable with the reciprocal-lattice vectors. The widths, k, of these phases are calculated by renormalization-group theory in 4- dimensions. We find k[(Tc-T)T]k, with k=12(k-1)1+2k2-4k+310(k-1)-8k3-20k2+6k+1100(k-1)2, where 2k is the order of the commensurability. Near Tc, the wave vector locks into every single commensurate value as the field is varied, thus generating a "devil's staircase"-like behavior. © 1981 The American Physical Society.

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