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20 April 2024 |
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Anomalous lattice response at the Mott transition in a quasi-2D organic conductor | M de Souza
; A Brühl
; Ch Strack
; B Wolf
; D Schweitzer
; M Lang
; | Date: |
20 Jul 2007 | Journal: | Phys Rev Lett, 99 (3), 037003 | Abstract: | Discontinuous changes of the lattice parameters at the Mott metal-insulator transition are detected by high-resolution dilatometry on deuterated crystals of the layered organic conductor kappa-(BEDT-TTF)(2)Cu[N(CN)(2)]Br. The uniaxial expansivities uncover a striking and unexpected anisotropy, notably a zero effect along the in-plane c axis along which the electronic interactions are relatively strong. A huge thermal expansion anomaly is observed near the end point of the first-order transition line enabling us to explore the critical behavior with very high sensitivity. The analysis yields critical fluctuations with an exponent alpha approximately 0.8+/-0.15 at odds with the novel criticality recently proposed for these materials [Kagawa et al., Nature (London) 436, 534 (2005)]. Our data suggest an intricate role of the lattice degrees of freedom in the Mott transition for the present materials. | Source: | PubMed, pmid17678316 | Services: | Forum | Review | Favorites |
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