Item request has been placed! ×
Item request cannot be made. ×
loading  Processing Request

Quantum criticality in the spin-1/2 Heisenberg chain system copper pyrazine dinitrate

Item request has been placed! ×
Item request cannot be made. ×
loading   Processing Request
  • Additional Information
    • Publication Information:
      American Association for the Advancement of Science
    • Publication Date:
      2021
    • Collection:
      KITopen (Karlsruhe Institute of Technologie)
    • Abstract:
      Low-dimensional quantum magnets promote strong correlations between magnetic moments that lead to fascinating quantum phenomena. A particularly interesting system is the antiferromagnetic spin-1/2 Heisenberg chain because it is exactly solvable by the Bethe-Ansatz method. It is approximately realized in the magnetic insulator copper pyrazine dinitrate, providing a unique opportunity for a quantitative comparison between theory and experiment. We investigate its thermodynamic properties with a particular focus on the field-induced quantum phase transition. Thermal expansion, magnetostriction, specific heat, magnetization, and magnetocaloric measurements are found to be in excellent agreement with exact Bethe-Ansatz predictions. Close to the critical field, thermodynamics obeys the expected quantum critical scaling behavior, and in particular, the magnetocaloric effect and the Grüneisen parameters diverge in a characteristic manner. Beyond its importance for quantum magnetism, our study establishes a paradigm of a quantum phase transition, which illustrates fundamental principles of quantum critical thermodynamics.
    • Relation:
      info:eu-repo/semantics/altIdentifier/wos/000426690900008; info:eu-repo/semantics/altIdentifier/issn/2375-2548; https://publikationen.bibliothek.kit.edu/1000128906
    • Online Access:
      https://publikationen.bibliothek.kit.edu/1000128906
    • Rights:
      info:eu-repo/semantics/openAccess
    • Accession Number:
      edsbas.14EB4EB1