Spin wave specific heat in quasiperiodic Fibonacci structures

Details Spin wave specific heat in quasiperiodic Fibonacci structures Spin wave specific heat in quasiperiodic Fibonacci structures

2001-02-04

arxiv.org/abs/cond-mat/0102046v1

Physics

Condensed Matter

Statistical Mechanics

4 PS figures, accepted for publication in Physica A

Scientific paper

10.1016/S0378-4371(01)00017-6

The energy spectra of a variety of collective modes on quasiperiodic structures exhibit a complex fractal profile. Among the modes that have attracted particular attention in this context, are the spin wave spectra of quasiperiodic magnetic multilayers that obey a substitutional sequence of the Fibonacci type. They are described within the framework of the Heisenberg theory. In order to have a deep insight on the relevant thermodynamical implications of the above mentioned energy spectra's fractal profile, we have performed analytical and numerical calculations of the spin wave specific heat associated with successive hierarchical sequences of the Fibonacci quasiperiodic structures. The spectra show interesting oscillatory behavior in the low-temperature region, which can be traced back to the spin wave's self-similar energy spectrum.

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