Spin Chain in Magnetic Field: Limitations of the Large-N Mean-Field Theory

• Authors: K. Wohlfeld , Cheng-Chien Chen , M. van Veenendaal , T. Devereaux
• Languages of publication: EN

Abstracts

EN

Motivated by the recent success in describing the spin and orbital spectrum of a spin-orbital chain using a large-N mean-field approximation, we apply the same formalism to the case of a spin chain in the external magnetic field. It occurs that in this case, which corresponds to N=2 in the approximation, the large-N mean-field theory cannot qualitatively reproduce the spin excitation spectra at high magnetic fields, which polarize more than 50% of the spins in the magnetic ground state. This, rather counterintuitively, shows that the physics of a spin chain can under some circumstances be regarded as more complex than the physics of a spin-orbital chain.

Keywords

EN

71.10.Fd; 75.10.Jm; 75.10.Pq

Discipline

• 75.10.Pq: Spin chain models
• 71.10.Fd: Lattice fermion models (Hubbard model, etc.)
• 75.10.Jm: Quantized spin models, including quantum spin frustration

• Publisher: Institute of Physics, Polish Academy of Sciences
• Journal: Acta Physica Polonica A
• Year: 2015
• Volume: 127
• Issue: 2
• Pages: 201-203

Dates

published

2015-02

Contributors

author

K. Wohlfeld

• Stanford Institute for Materials and Energy Sciences, SLAC National Laboratory and Stanford University, Menlo Park, California 94025, USA
• Institute of Theoretical Physics, Faculty of Physics, University of Warsaw, Pasteura 5, PL-02093 Warszawa, Poland

author

Cheng-Chien Chen

• Advanced Photon Source, Argonne National Laboratory, Argonne, Illinois 60439, USA

author

M. van Veenendaal

• Advanced Photon Source, Argonne National Laboratory, Argonne, Illinois 60439, USA
• Department of Physics, Northern Illinois University, De Kalb, Illinois 60115, USA

author

T. Devereaux

• Stanford Institute for Materials and Energy Sciences, SLAC National Laboratory and Stanford University, Menlo Park, California 94025, USA

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Identifiers

DOI

10.12693/APhysPolA.127.201