Universität zu Köln

Gati, Elena, Garst, Markus ORCID: 0000-0001-5390-3316, Manna, Rudra S., Tutsch, Ulrich, Wolf, Bernd, Bartosch, Lorenz, Schubert, Harald, Sasaki, Takahiko ORCID: 0000-0002-0767-5428, Schlueter, John A. and Lang, Michael (2016). Breakdown of Hooke's law of elasticity at the Mott critical endpoint in an organic conductor. Sci. Adv., 2 (12). WASHINGTON: AMER ASSOC ADVANCEMENT SCIENCE. ISSN 2375-2548

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Abstract

The Mott metal-insulator transition, a paradigm of strong electron-electron correlations, has been considered as a source of intriguing phenomena. Despite its importance for a wide range of materials, fundamental aspects of the transition, such as its universal properties, are still under debate. We report detailed measurements of relative length changes Delta L/L as a function of continuously controlled helium-gas pressure P for the organic conductor kappa-(BEDT-TTF)(2)Cu[N(CN)(2)] Cl across the pressure-induced Mott transition. We observe strongly nonlinear variations of Delta L/L with pressure around the Mott critical endpoint, highlighting a breakdown of Hooke's law of elasticity. We assign these nonlinear strain-stress relations to an intimate, nonperturbative coupling of the critical electronic system to the lattice degrees of freedom. Our results are fully consistent with mean-field criticality, predicted for electrons in a compressible lattice with finite shear moduli. We argue that the Mott transition for all systems that are amenable to pressure tuning shows the universal properties of an isostructural solid-solid transition.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Gati, Elena UNSPECIFIED UNSPECIFIED UNSPECIFIED Garst, Markus UNSPECIFIED orcid.org/0000-0001-5390-3316 UNSPECIFIED Manna, Rudra S. UNSPECIFIED UNSPECIFIED UNSPECIFIED Tutsch, Ulrich UNSPECIFIED UNSPECIFIED UNSPECIFIED Wolf, Bernd UNSPECIFIED UNSPECIFIED UNSPECIFIED Bartosch, Lorenz UNSPECIFIED UNSPECIFIED UNSPECIFIED Schubert, Harald UNSPECIFIED UNSPECIFIED UNSPECIFIED Sasaki, Takahiko UNSPECIFIED orcid.org/0000-0002-0767-5428 UNSPECIFIED Schlueter, John A. UNSPECIFIED UNSPECIFIED UNSPECIFIED Lang, Michael UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-253822
DOI:	10.1126/sciadv.1601646
Journal or Publication Title:	Sci. Adv.
Volume:	2
Number:	12
Date:	2016
Publisher:	AMER ASSOC ADVANCEMENT SCIENCE
Place of Publication:	WASHINGTON
ISSN:	2375-2548
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language HIGH-TEMPERATURE SUPERCONDUCTIVITY; CRITICAL-BEHAVIOR; FINITE-TEMPERATURE; TRANSITION; INSULATOR; INSTABILITIES; V2O3; SALT; NMR Multiple languages Multidisciplinary Sciences Multiple languages
Refereed:	Yes
URI:	http://kups.ub.uni-koeln.de/id/eprint/25382