Spinon signatures in the critical phase of the (1,1/2) ferrimagnet in a magnetic field

Details Spinon signatures in the critical phase of the (1,1/2) ferrimagnet in a magnetic field Spinon signatures in the critical phase of the (1,1/2) ferrimagnet in a magnetic field

1998-12-18

arxiv.org/abs/cond-mat/9812326v1

Phys.Rev. B vol. 59, 13565-8 (1999)

Physics

Condensed Matter

Strongly Correlated Electrons

4 RevTeX pages, 2 ps figures included

Scientific paper

10.1103/PhysRevB.59.13565

We propose an effective theory for the critical phase of a quantum ferrimagnetic chain with alternating spins 1 and 1/2 in an external magnetic field. With the help of the matrix product variational approach, the system is mapped to a spin-1/2 XXZ chain in an (effective) magnetic field; as a byproduct, we obtain an excellent description of the optical magnon branch in the gapped phase. Recent finite-temperature DMRG results for the low-temperature part of the specific heat are well described by the present approach, and the ``pop-up'' peaks, developing near the critical field values and in the middle of the critical phase, are identified with the contributions from two different spinon bands of the effective spin-1/2 chain. The effect should be as well observable in other spin-gap systems in an external field, particularly in spin ladders.

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