2002/11/01 by Oliver Breunig, Markus Garst, Andreas Klümper +6
Arts and Humanities · Chemistry · Engineering · Materials Science · Physics and Astronomy · Social Sciences · #Chain (unit) #Charter #Chemistry #Condensed matter physics #Copper #Criticality #Cruise Tourism Development and Management #Law #Magnetism in coordination complexes #Maritime Ports and Logistics #Maritime and Coastal Archaeology #Materials science #Nuclear physics #Organic and Molecular Conductors Research #Physics #Physics of Superconductivity and Magnetism #Political science #Pyrazine #Quantum #Quantum mechanics #Spin (aerodynamics) #Stereochemistry #Thermodynamics #cond-mat.str-el
paper · pdf · doi:10.1126/sciadv.aao3773
published as Science Advances 3, eaao3773 (2017) · 14 pages, 3 figures main text and supplementary material 8 pages, 3 figures
openalex publication_date 2002/11/01 · openalex created_date 2016/06/24 · arxiv created 2017/09/01 · arxiv updated 2018/01/04 · openalex updated_date 2026/08/01
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.