Electronic structure of the α-(BEDT-TTF)2I3 surface by photoelectron spectroscopy

Émilie Tisserond, Niloufar Nilforoushan, Marco Caputo, Pere Alemany, Enric Canadell, Lama Khalil, Ivana Vobornik, Jun Fujii, Pranab Kumar Das, Cécile Mézière, Patrick Batail, Jean-Paul Pouget, Claude Pasquier, Marino Marsi and Miguel Monteverde ()
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Émilie Tisserond: Laboratoire de Physique des Solides, CNRS-Université Paris-Sud UMR 8502
Niloufar Nilforoushan: Laboratoire de Physique des Solides, CNRS-Université Paris-Sud UMR 8502
Marco Caputo: Laboratoire de Physique des Solides, CNRS-Université Paris-Sud UMR 8502
Pere Alemany: Departament de Ciència de Materials i Química Física and Institut de Química Teórica i Computacional (IQTCUB), Universitat de Barcelona
Enric Canadell: Institut de Ciència de Materials de Barcelona (CSIC), Campus UAB
Lama Khalil: Laboratoire de Physique des Solides, CNRS-Université Paris-Sud UMR 8502
Ivana Vobornik: CNR-IOM Laboratorio TASC
Jun Fujii: CNR-IOM Laboratorio TASC
Pranab Kumar Das: CNR-IOM Laboratorio TASC
Cécile Mézière: MOLTECH-Anjou, CNRS-Université d’Angers UMR 6200, Bâtiment K
Patrick Batail: MOLTECH-Anjou, CNRS-Université d’Angers UMR 6200, Bâtiment K
Jean-Paul Pouget: Laboratoire de Physique des Solides, CNRS-Université Paris-Sud UMR 8502
Claude Pasquier: Laboratoire de Physique des Solides, CNRS-Université Paris-Sud UMR 8502
Marino Marsi: Laboratoire de Physique des Solides, CNRS-Université Paris-Sud UMR 8502
Miguel Monteverde: Laboratoire de Physique des Solides, CNRS-Université Paris-Sud UMR 8502

The European Physical Journal B: Condensed Matter and Complex Systems, 2019, vol. 92, issue 4, 1-6

Abstract: Abstract We report anomalies observed in photoelectron spectroscopy measurements performed on α-(BEDT-TTF)2I3 crystals. In particular, above its metal-insulator transition temperature (T = 135 K), we observe the lack of a sharp Fermi edge in contradiction with the metallic transport properties exhibited by this quasi-bidimensional organic material. We interpret these unusual results as a signature of a one-dimensional electronic behavior confirmed by DFT band structure calculations. Using photoelectron spectroscopy we probe a Luttinger liquid with a large correlation parameter (α > 1) that we interpret to be caused by the chain-like electronic structure of α-(BEDT-TTF)2I3 surface doped by iodine defects. These new surface effects are inaccessible by bulk sensitive measurements of electronic transport techniques. Graphical abstract

Keywords: Solid; State; and; Materials (search for similar items in EconPapers)
Date: 2019
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DOI: 10.1140/epjb/e2019-90565-4

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