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Antikink dispersions of the J1J2 sawtooth spin-1/2 anisotropic Heisenberg antiferromagnetic chain

  • Susobhan Paul
  • Asim Kumar GhoshEmail author
Regular Article
  • 41 Downloads

Abstract

Antikink dispersion of the asymmetric J1J2 sawtooth spin-1/2 anisotropic Heisenberg antiferromagnetic (AFM) chain has been derived. Value of spin-gap is obtained by estimating the minimum of dispersion relation variationally. The exact doubly degenerate ground state energy has been derived at the symmetric point, J1 = J2, for the whole anisotropic regime. Analytic form of dispersion relations of three different antikink states is obtained and their validity in the parameter space is discussed. The value of spin-gap, specific heat and susceptibility are estimated numerically by diagonalizing the Hamiltonian for chains of finite length. The inherent frustration of this AFM model leads to the appearance of additional peak at low-temperatures in the specific heat.

Graphical abstract

Keywords

Solid State and Materials 

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Copyright information

© EDP Sciences, SIF and Springer-Verlag GmbH Germany, part of Springer Nature 2019

Authors and Affiliations

  1. 1.Department of PhysicsScottish Church College, Urquhart SquareKolkataIndia
  2. 2.Department of PhysicsJadavpur UniversityKolkataIndia

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