On the incommensurate phase in modulated Heisenberg chains

Issue		Eur. Phys. J. B Volume 5, Number 3, October_I 1998


Page(s)		521 - 528
DOI		http://dx.doi.org/10.1007/s100510050473

Contents | PDF_file_(345 Kb)

Eur. Phys. J. B 5, 521-528

On the incommensurate phase
in modulated Heisenberg chains

F. Schönfeld - G. Bouzerar - G.S. Uhrig - E. Müller-Hartmann

Institut für Theoretische Physik, Universität zu Köln, Zülpicher Strasse 77, Köln 50937, Germany

Received: 9 March 1998 / Accepted: 17 April 1998

Abstract
Using the density matrix renormalization group method (DMRG) we calculate the magnetization of frustrated S=1/2 Heisenberg chains for various modulation patterns of the nearest neighbour coupling: commensurate, incommensurate with sinusoidal modulation and incommensurate with solitonic modulation. We focus on the order of the phase transition from the commensurate dimerized phase (D) to the incommensurate phase (I). It is shown that the order of the phase transition depends sensitively on the model. For the solitonic model in particular, a k-dependent elastic energy modifies the order of the transition. Furthermore, we calculate gaps in the incommensurate phase in adiabatic approximation.

PACS
71.27.+a Strongly correlated electron systems; heavy fermions - 75.10.-b General theory
and models of magnetic ordering - 75.10.Jm Quantized spin models

Author for correspondance: fsch@thp.uni-koeln.de

Contents | PDF_file_(345 Kb)

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