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


Dell Amore, R; Schilling, A; Krämer, K (2008). Fraction of Bose-Einstein condensed triplons in TlCuCl3 from magnetization data. Physical Review B, 78(22):224403-8pages.

Abstract

TlCuCl3 is a quantum-spin-(1/2) 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 µ0H<~µ0Hc[approximate]5.5 T. 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=0 K and right above the critical field Hc, this fraction is [approximate]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.

Abstract

TlCuCl3 is a quantum-spin-(1/2) 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 µ0H<~µ0Hc[approximate]5.5 T. 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=0 K and right above the critical field Hc, this fraction is [approximate]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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Additional indexing

Item Type:Journal Article, refereed, original work
Communities & Collections:07 Faculty of Science > Physics Institute
Dewey Decimal Classification:530 Physics
Language:English
Date:4 November 2008
Deposited On:09 Feb 2009 15:46
Last Modified:05 Apr 2016 12:50
Publisher:The American Physical Society
ISSN:1098-0121
Publisher DOI:https://doi.org/10.1103/PhysRevB.78.224403

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