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:
CreatorsEmailORCIDORCID Put Code
Gati, ElenaUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Garst, MarkusUNSPECIFIEDorcid.org/0000-0001-5390-3316UNSPECIFIED
Manna, Rudra S.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Tutsch, UlrichUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Wolf, BerndUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Bartosch, LorenzUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Schubert, HaraldUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Sasaki, TakahikoUNSPECIFIEDorcid.org/0000-0002-0767-5428UNSPECIFIED
Schlueter, John A.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Lang, MichaelUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
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:
KeywordsLanguage
HIGH-TEMPERATURE SUPERCONDUCTIVITY; CRITICAL-BEHAVIOR; FINITE-TEMPERATURE; TRANSITION; INSULATOR; INSTABILITIES; V2O3; SALT; NMRMultiple languages
Multidisciplinary SciencesMultiple languages
Refereed: Yes
URI: http://kups.ub.uni-koeln.de/id/eprint/25382

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