Evidence of a field-induced Berezinskii-Kosterlitz-Thouless scenario in a two-dimensional spin-dimer system

U. Tutsch, B. Wolf, S. Wessel, L. Postulka, Y. Tsui, Harald Olaf Jeschke, I. Opahle, T. Saha-Dasgupta, R. Valentí, A. Brühl, K. Remović-Langer, T. Kretz, H. W. Lerner, M. Wagner, M. Lang

Research output: Contribution to journalArticle

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Abstract

Two-dimensional (2D) systems with continuous symmetry lack conventional long-range order because of thermal fluctuations. Instead, as pointed out by Berezinskii, Kosterlitz and Thouless (BKT), 2D systems may exhibit so-called topological order driven by the binding of vortex-antivortex pairs. Signatures of the BKT mechanism have been observed in thin films, specially designed heterostructures, layered magnets and trapped atomic gases. Here we report on an alternative approach for studying BKT physics by using a chemically constructed multilayer magnet. The novelty of this approach is to use molecular-based pairs of spin S=1/2. ions, which, by the application of a magnetic field, provide a gas of magnetic excitations. On the basis of measurements of the magnetic susceptibility and specific heat on a so-designed material, combined with density functional theory and quantum Monte Carlo calculations, we conclude that these excitations have a distinct 2D character, consistent with a BKT scenario, implying the emergence of vortices and antivortices.

Original languageEnglish
Article number5169
JournalNature Communications
Volume5
DOIs
Publication statusPublished - 2014
Externally publishedYes

Fingerprint

Magnets
Dimers
Vortex flow
magnets
Hot Temperature
Quantum Theory
Gases
dimers
vortices
monatomic gases
Physics
Magnetic Fields
Magnetic susceptibility
excitation
Specific heat
Density functional theory
Heterojunctions
Multilayers
signatures
specific heat

ASJC Scopus subject areas

  • Biochemistry, Genetics and Molecular Biology(all)
  • Chemistry(all)
  • Physics and Astronomy(all)

Cite this

Evidence of a field-induced Berezinskii-Kosterlitz-Thouless scenario in a two-dimensional spin-dimer system. / Tutsch, U.; Wolf, B.; Wessel, S.; Postulka, L.; Tsui, Y.; Jeschke, Harald Olaf; Opahle, I.; Saha-Dasgupta, T.; Valentí, R.; Brühl, A.; Remović-Langer, K.; Kretz, T.; Lerner, H. W.; Wagner, M.; Lang, M.

In: Nature Communications, Vol. 5, 5169, 2014.

Research output: Contribution to journalArticle

Tutsch, U, Wolf, B, Wessel, S, Postulka, L, Tsui, Y, Jeschke, HO, Opahle, I, Saha-Dasgupta, T, Valentí, R, Brühl, A, Remović-Langer, K, Kretz, T, Lerner, HW, Wagner, M & Lang, M 2014, 'Evidence of a field-induced Berezinskii-Kosterlitz-Thouless scenario in a two-dimensional spin-dimer system', Nature Communications, vol. 5, 5169. https://doi.org/10.1038/ncomms6169
Tutsch, U. ; Wolf, B. ; Wessel, S. ; Postulka, L. ; Tsui, Y. ; Jeschke, Harald Olaf ; Opahle, I. ; Saha-Dasgupta, T. ; Valentí, R. ; Brühl, A. ; Remović-Langer, K. ; Kretz, T. ; Lerner, H. W. ; Wagner, M. ; Lang, M. / Evidence of a field-induced Berezinskii-Kosterlitz-Thouless scenario in a two-dimensional spin-dimer system. In: Nature Communications. 2014 ; Vol. 5.
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