Breunig, Oliver ORCID: 0000-0001-8651-1757, Garst, Markus ORCID: 0000-0001-5390-3316, Kluemper, Andreas, Rohrkamp, Jens, Turnbull, Mark M. and Lorenz, Thomas ORCID: 0000-0003-4832-5157 (2017). Quantum criticality in the spin-1/2 Heisenberg chain system copper pyrazine dinitrate. Sci. Adv., 3 (12). WASHINGTON: AMER ASSOC ADVANCEMENT SCIENCE. ISSN 2375-2548

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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 Gruneisen 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.

Item Type: Journal Article
Creators:
CreatorsEmailORCIDORCID Put Code
Breunig, OliverUNSPECIFIEDorcid.org/0000-0001-8651-1757UNSPECIFIED
Garst, MarkusUNSPECIFIEDorcid.org/0000-0001-5390-3316UNSPECIFIED
Kluemper, AndreasUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Rohrkamp, JensUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Turnbull, Mark M.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Lorenz, ThomasUNSPECIFIEDorcid.org/0000-0003-4832-5157UNSPECIFIED
URN: urn:nbn:de:hbz:38-210457
DOI: 10.1126/sciadv.aao3773
Journal or Publication Title: Sci. Adv.
Volume: 3
Number: 12
Date: 2017
Publisher: AMER ASSOC ADVANCEMENT SCIENCE
Place of Publication: WASHINGTON
ISSN: 2375-2548
Language: English
Faculty: Faculty of Mathematics and Natural Sciences
Divisions: Faculty of Mathematics and Natural Sciences > Department of Physics > Institute of Physics II
Subjects: no entry
Uncontrolled Keywords:
KeywordsLanguage
THERMODYNAMICS; EXCHANGE; PHASE; MODELMultiple languages
Multidisciplinary SciencesMultiple languages
Refereed: Yes
URI: http://kups.ub.uni-koeln.de/id/eprint/21045

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