Fraction of Bose-Einstein condensed triplons in TlCuCl3 from magnetization data

Raffaele Dell’Amore, Andreas Schilling, and Karl Krämer
Phys. Rev. B 78, 224403 – Published 4 December 2008

Abstract

TlCuCl3 is a quantum-spin-12 system which shows a gap between the singlet ground state of the Cu2+ dimers and the first excited triplet Sz=+1 state for magnetic fields μ0Hμ0Hc5.5T. At larger magnetic fields the gap is suppressed, and a Bose-Einstein condensation of triplets is supposed to occur, leading to a magnetic phase with antiferromagnetic long-range order of the transverse spin components. In this study we calculate the fraction of condensed magnetic quasiparticles of TlCuCl3 from magnetization M(T,H) data. At T=0K and right above the critical field Hc, this fraction is 98% of the total number of triplons, and is independent of the direction of the magnetic field if we assume the presence of a small intrinsic magnetic background with S=1 magnetic moments.

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  • Received 3 June 2008

DOI:https://doi.org/10.1103/PhysRevB.78.224403

©2008 American Physical Society

Authors & Affiliations

Raffaele Dell’Amore* and Andreas Schilling

  • Physik-Institut, University of Zurich, Winterthurerstrasse 190, 8057 Zurich, Switzerland

Karl Krämer

  • Department of Chemistry and Biochemistry, University of Bern, 3000 Bern 9, Switzerland

  • *dellamore@physik.uzh.ch
  • schilling@physik.uzh.ch
  • karl.kraemer@iac.unibe.ch

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Issue

Vol. 78, Iss. 22 — 1 December 2008

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