https://doi.org/10.1140/epjb/e2016-70057-y
Regular Article
Alternating-spin S = 3/2 and σ = 1/2 Heisenberg chain with isotropic three-body exchange interactions
1 Department of Physics, Bielefeld
University, P.O. Box
100131, 33501
Bielefeld,
Germany
2 Institute of Solid State Physics,
Bulgarian Academy of Sciences, Tzarigradsko chaussee 72, 1784
Sofia,
Bulgaria
3 Department of Engineering Sciences
and Mathematics, University of Applied Sciences, 33619
Bielefeld,
Germany
a e-mail: jschnack@uni-bielefeld.de
Received:
26
January
2016
Received in final form:
24
March
2016
Published online:
12
May
2016
The promotion of collinear classical spin configurations as well as the enhanced tendency towards nearest-neighbor clustering of the quantum spins are typical features of the frustrating isotropic three-body exchange interactions in Heisenberg spin systems. Based on numerical density-matrix renormalization group calculations, we demonstrate that these extra interactions in the Heisenberg chain constructed from alternating S = 3/2 and σ = 1/2 site spins can generate numerous specific quantum spin states, including some partially-polarized ferrimagnetic states as well as a doubly-degenerate non-magnetic gapped phase. In the non-magnetic region of the phase diagram, the model describes a crossover between the spin-1 and spin-2 Haldane-type states.
Key words: Solid State and Materials
© EDP Sciences, Società Italiana di Fisica, Springer-Verlag, 2016