AIP conference proceedings

Novel treatment of the Heisenberg spin-1 chain: Application to Ni(C2H8N2)2NO2(ClO4)α

Alexei M. Tsvelik

Published Jan 1, 1990• 0 citations

Abstract

We suggest a new field theory treatment of the Heisenberg spin‐1 chain with a single‐ion anisotropy as a theory of three Majorana (real) fermions. We calculate the static and dynamic magnetic susceptibilities and eliminate the reported contradiction between excitation gaps deduced from high‐field magnetization measurements and neutron scattering data.

DOI: 10.1063/1.39738

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AIP conference proceedings

Novel treatment of the Heisenberg spin-1 chain: Application to Ni(C2H8N2)2NO2(ClO4)α

Alexei M. Tsvelik

Published Jan 1, 1990• 0 citations

Publisher

Abstract

DOI: 10.1063/1.39738

Related papers

Field-theory treatment of the Heisenberg spin-1 chain

Alexei M. Tsvelik

We suggest a new field-theory treatment of the Heisenberg spin-1 chain with a single-ion anisotropy as a theory of three Majorana (real) fermions. We calculate the static and dynamic magnetic susceptibilities. We show that our results are in a good agreement with the experimental data for NENP [Ni( ${\mathrm{C}}_{2}$ ${\mathrm{H}}_{8}$ ${\mathrm{N}}_{2}$ ) ${\mathrm{NO}}_{2}$ ${\mathrm{ClO}}_{4}$ ] compound. In particular, we eliminate the reported contradiction between excitation gaps deduced from high-field magnetization measurements and neutron scattering.We suggest a new field-theory treatment of the Heisenberg spin-1 chain with a single-ion anisotropy as a theory of three Majorana (real) fermions. We calculate the static and dynamic magnetic susceptibilities. We show that our results are in a good agreement with the experimental data for NENP [Ni(${\mathrm{C}}_{2}$${\mathrm{H}}_{8}$${\mathrm{N}}_{2}$)${\mathrm{NO}}_{2}$${\mathrm{ClO}}_{4}$] compound. In particular, we eliminate the reported contradiction between excitation gaps deduced from high-field magnetization measurements and neutron scattering.

Physical review. B, Condensed matterDec 1, 1990151 citations

A Quantum Spin Chain in High Magnetic Fields

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{\mathrm{C}}_{2}

{\mathrm{H}}_{8}

{\mathrm{N}}_{2}

)

{\mathrm{NO}}_{2}

{\mathrm{ClO}}_{4}

] compound. In particular, we eliminate the reported contradiction between excitation gaps deduced from high-field magnetization measurements and neutron scattering.

{\mathrm{C}}_{2}

{\mathrm{H}}_{8}

{\mathrm{N}}_{2}

{)}_{2}

{\mathrm{NO}}_{2}

{\mathrm{ClO}}_{4}

(NENP). We discuss the relationship between our results and the magnetic-susceptibility measurements as well as the inelastic-neutron-scattering data and on the Haldane conjecture. Values are proposed for the parameters D and J in the case of NENP.