Quantum phase transitions in the one-dimensional S=1 spin-orbital model: Implications for cubic vanadates

Satoshi Miyashita, Akira Kawaguchi, Norio Kawakami, and Giniyat Khaliullin
Phys. Rev. B 69, 104425 – Published 24 March 2004
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Abstract

We investigate ground-state properties and quantum phase transitions in the one-dimensional S=1 spin-orbital model relevant to cubic vanadates. Using the density-matrix renormalization group, we compute the ground-state energy, the magnetization, and the correlation functions for different values of the Hund’s coupling JH and the external magnetic field. It is found that the magnetization jumps at a certain critical field, which is a hallmark of the field-induced first-order phase transition. The phase transition driven by JH is also of first order. We also consider how the lattice-induced ferro-type interaction between orbitals modifies the phase diagram, and discuss the results in a context of the first-order phase transition observed in YVO3 at 77 K.

  • Received 7 October 2003

DOI:https://doi.org/10.1103/PhysRevB.69.104425

©2004 American Physical Society

Authors & Affiliations

Satoshi Miyashita, Akira Kawaguchi*, and Norio Kawakami

  • Department of Applied Physics, Osaka University, Suita, Osaka 565-0871, Japan

Giniyat Khaliullin

  • Max-Planck-Institut für Festkörperforschung, Heisenbergstrasse 1, D-70569 Stuttgart, Germany

  • *Present address: NTT Basic Research Laboratories, Atsugi, Kanagawa 243-0198, Japan.

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Vol. 69, Iss. 10 — 1 March 2004

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