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 ΔL/L as a function of continuously controlled helium-gas pressure P for the organic conductor κ-(BEDT-TTF)2Cu[N(CN)2]Cl across the pressure-induced Mott transition. We observe strongly nonlinear variations of ΔL/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.
journal_name
Sci Advjournal_title
Science advancesauthors
Gati E,Garst M,Manna RS,Tutsch U,Wolf B,Bartosch L,Schubert H,Sasaki T,Schlueter JA,Lang Mdoi
10.1126/sciadv.1601646subject
Has Abstractpub_date
2016-12-07 00:00:00pages
e1601646issue
12issn
2375-2548pii
1601646journal_volume
2pub_type
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