Phase coexistence at the first-order Mott transition revealed by pressure-dependent dielectric spectroscopy of κ - (BEDT-TTF)2 - Cu2 (CN)3

Rösslhuber, R.; Pustogow, A.; Uykur, E.; Böhme, A.; Löhle, A.; Hübner, R.; Schlueter, J. A.; Tan, Y.; Dobrosavljević, V.; Dressel, M.

doi:10.1103/physrevb.103.125111

Title: Phase coexistence at the first-order Mott transition revealed by pressure-dependent dielectric spectroscopy of κ - (BEDT-TTF)₂ - Cu₂ (CN)₃

Journal Article · Fri Mar 05 00:00:00 EST 2021 · Physical Review B

DOI:https://doi.org/10.1103/physrevb.103.125111· OSTI ID:1779061

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^[2]; Uykur, E. ^[1]; Böhme, A. ^[1]; Löhle, A. ^[1];

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^[3]; Tan, Y. ^[4];

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Univ. of Stuttgart (Germany)
Univ. of Stuttgart (Germany); Univ. of California, Los Angeles, CA (United States); Vienna Univ. of Technology (Austria)
Argonne National Lab. (ANL), Argonne, IL (United States)
Florida State Univ., Tallahassee, FL (United States)

The dimer Mott insulator kappa - (BEDT-TTF)₂ - Cu₂ (CN)₃ can be tuned into metallic and superconducting states on applying pressure of 1.5 kbar and more. We have performed dielectric measurements (7.5 kHz to 5 MHz) on kappa - (BEDT-TTF)₂ - Cu₂ (CN)₃ single crystals as a function of temperature (down to T = 8 K) and pressure (up to p = 4.3 kbar). In addition to the relaxor-like dielectric behavior seen below 50 K at p = 0, that moves toward lower temperatures with pressure, a second peak emerges in ε₁ (T) around T = 15 K. When approaching the insulator-metal boundary, this peak diverges rapidly reaching ε₁ ≈ 10⁵. Our dynamical mean-field theory calculations substantiate that the dielectric catastrophe at the Mott transition is not caused by closing the energy gap, but due to the spatial coexistence of correlated metallic and insulating regions. We discuss the percolative nature of the first-order Mott insulator-to-metal transition in all details.

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Research Organization:: Argonne National Laboratory (ANL), Argonne, IL (United States)

Sponsoring Organization:: Alexander von Humboldt Foundation; European Union - European Social Fund (ESF); National Science Foundation (NSF); National High Magnetic Field Laboratory (NHMFL); German Research Foundation (DFG)

Grant/Contract Number:: AC02-06CH11357

OSTI ID:: 1779061

Journal Information:: Physical Review B, Vol. 103, Issue 12; ISSN 2469-9950

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Dynamical mean-field theory of strongly correlated fermion systems and the limit of infinite dimensions Georges, Antoine; Kotliar, Gabriel; Krauth, Werner Reviews of Modern Physics, Vol. 68, Issue 1 https://doi.org/10.1103/RevModPhys.68.13	journal	January 1996
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Realization of Superconductivity at Ambient Pressure by Band-Filling Control in κ- ( B E D T - T T F ) ₂ C u ₂ ( C N ) ₃ Komatsu, Tokutaro; Matsukawa, Nozomu; Inoue, Takeharu Journal of the Physical Society of Japan, Vol. 65, Issue 5 https://doi.org/10.1143/JPSJ.65.1340	journal	May 1996
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75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
Dielectric properties
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Title: Phase coexistence at the first-order Mott transition revealed by pressure-dependent dielectric spectroscopy of κ - (BEDT-TTF)2 - Cu2 (CN)3

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Title: Phase coexistence at the first-order Mott transition revealed by pressure-dependent dielectric spectroscopy of κ - (BEDT-TTF)₂ - Cu₂ (CN)₃