Universität zu Köln

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:	Creators Email ORCID ORCID Put Code Breunig, Oliver UNSPECIFIED orcid.org/0000-0001-8651-1757 UNSPECIFIED Garst, Markus UNSPECIFIED orcid.org/0000-0001-5390-3316 UNSPECIFIED Kluemper, Andreas UNSPECIFIED UNSPECIFIED UNSPECIFIED Rohrkamp, Jens UNSPECIFIED UNSPECIFIED UNSPECIFIED Turnbull, Mark M. UNSPECIFIED UNSPECIFIED UNSPECIFIED Lorenz, Thomas UNSPECIFIED orcid.org/0000-0003-4832-5157 UNSPECIFIED
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:	Keywords Language THERMODYNAMICS; EXCHANGE; PHASE; MODEL Multiple languages Multidisciplinary Sciences Multiple languages
Refereed:	Yes
URI:	http://kups.ub.uni-koeln.de/id/eprint/21045