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Large Magnetocaloric Effect at the Saturation Field of an S=1/2 Antiferromagnetic Heisenberg Chain

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Abstract

We report low-temperature magnetization measurements on a copper-containing coordination polymer [Cu(μ-C2O4)(4-aminopyridine)2(H2O)] n . According to these measurements and previous results (Prokofiev et al. in Cryst. Res. Technol. 42, 394, 2007), the material is a very good realization of an S=1/2 antiferromagnetic Heisenberg chain with a small saturation field B s =4.2 T, which marks the endpoint of a quantum-critical line in the B–T plane. Measurements of the magnetocaloric effect at low temperatures T=0.47 K across the saturation field yields a very large magnetothermal response with a characteristic sign change close to the quantum-critical point. The data are in good agreement with the quantum-critical behavior calculated on the basis of exact diagonalization and quantum Monte Carlo simulations.

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Authors and Affiliations

  1. Physikalisches Institut, Goethe-Universität, SFB/TR49, 60438, Frankfurt, Germany

    M. Lang, Y. Tsui, B. Wolf, D. Jaiswal-Nagar, U. Tutsch, K. Remović-Langer, A. Prokofiev & W. Assmus

  2. University of Southampton, Southampton, UK

    Y. Tsui

  3. Institut für Theoretische Physik, Georg-August-Universität, 37077, Göttingen, Germany

    A. Honecker

  4. Institut für Festkörperphysik, Technische Universität Wien, 1040, Wien, Austria

    A. Prokofiev

  5. MPI für Chemische Physik fester Stoffe, 01187, Dresden, Germany

    G. Donath

Authors
  1. M. Lang
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  2. Y. Tsui
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  3. B. Wolf
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  4. D. Jaiswal-Nagar
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  5. U. Tutsch
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  6. A. Honecker
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  7. K. Remović-Langer
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  8. A. Prokofiev
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  9. W. Assmus
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  10. G. Donath
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Correspondence to M. Lang.

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Lang, M., Tsui, Y., Wolf, B. et al. Large Magnetocaloric Effect at the Saturation Field of an S=1/2 Antiferromagnetic Heisenberg Chain. J Low Temp Phys 159, 88–91 (2010). https://doi.org/10.1007/s10909-009-0092-8

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  • DOI: https://doi.org/10.1007/s10909-009-0092-8

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