Sequence of first-order quantum phase transitions in a frustrated spin half dimer-plaquette chain

Details Sequence of first-order quantum phase transitions in a frustrated spin half dimer-plaquette chain Sequence of first-order quantum phase transitions in a frustrated spin half dimer-plaquette chain

2002-06-27

arxiv.org/abs/cond-mat/0206538v1

Phys. Rev. B 66, 134419 (2002)

Physics

Condensed Matter

Strongly Correlated Electrons

14 pages, 11 figures, submitted to Phys. Rev. B

Scientific paper

10.1103/PhysRevB.66.134419

We study the frustrated dimer-plaquette quantum spin chain for ferromagnetic dimer bonds. This quantum system undergoes a series of first-order ground-state phase transitions driven by frustration or by a magnetic field. We find that the different nature of the ground-state phases has a strong influence on the magnetization curve as well as the low-temperature thermodynamics. In particular, the magnetization curve exhibits plateaus and jumps, the number of which depends on the strength of frustration. The temperature dependence of the susceptibility may either show activated spin-gap behaviour for small frustration or Curie like paramagnetic behaviour for strong frustration.

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