Lattice Dynamics Coupled to Charge and Spin Degrees of Freedom in the Molecular Dimer-Mott Insulator κ(BEDTTTF)2Cu[N(CN)2]Cl

Masato Matsuura, Takahiko Sasaki, Satoshi Iguchi, Elena Gati, Jens Müller, Oliver Stockert, Andrea Piovano, Martin Böhm, Jitae T. Park, Sananda Biswas, Stephen M. Winter, Roser Valentí, Akiko Nakao, and Michael Lang
Phys. Rev. Lett. 123, 027601 – Published 10 July 2019; Erratum Phys. Rev. Lett. 125, 239901 (2020)
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Abstract

Inelastic neutron scattering measurements on the molecular dimer-Mott insulator κ(BEDTTTF)2Cu[N(CN)2]Cl reveal a phonon anomaly in a wide temperature range. Starting from Tins5060K where the charge gap opens, the low-lying optical phonon modes become overdamped upon cooling towards the antiferromagnetic ordering temperature TN=27K, where also a ferroelectric ordering at TFETN occurs. Conversely, the phonon damping becomes small again when spins and charges are ordered below TN, while no change of the lattice symmetry is observed across TN in neutron diffraction measurements. We assign the phonon anomalies to structural fluctuations coupled to charge and spin degrees of freedom in the BEDT-TTF molecules.

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  • Received 28 December 2018
  • Revised 24 May 2019

DOI:https://doi.org/10.1103/PhysRevLett.123.027601

© 2019 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied Physics

Erratum

Erratum: Lattice Dynamics Coupled to Charge and Spin Degrees of Freedom in the Molecular Dimer-Mott Insulator κ-(BEDTTTF)2Cu[N(CN)2]Cl [Phys. Rev. Lett. 123, 027601 (2019)]

Masato Matsuura, Takahiko Sasaki, Satoshi Iguchi, Elena Gati, Jens Müller, Oliver Stockert, Andrea Piovano, Martin Böhm, Jitae T. Park, Sananda Biswas, Stephen M. Winter, Roser Valentí, Akiko Nakao, and Michael Lang
Phys. Rev. Lett. 125, 239901 (2020)

Authors & Affiliations

Masato Matsuura1,*, Takahiko Sasaki2, Satoshi Iguchi2, Elena Gati3, Jens Müller3, Oliver Stockert4, Andrea Piovano5, Martin Böhm5, Jitae T. Park6, Sananda Biswas7, Stephen M. Winter7, Roser Valentí7, Akiko Nakao1, and Michael Lang3

  • 1Neutron Science and Technology Center, Comprehensive Research Organization for Science and Society (CROSS), Tokai, Ibaraki 319-1106, Japan
  • 2Institute for Materials Research, Tohoku University, Sendai 980-8577, Japan
  • 3Institute of Physics, Goethe-University Frankfurt, 60438 Frankfurt (M), Germany
  • 4Max-Planck-Institut für Chemische Physik fester Stoffe, D-01187 Dresden, Germany
  • 5Institut Laue-Langevin, 71 avenue des Martyrs, 38042 Grenoble Cedex 9, France
  • 6Heinz Maier-Leibnitz Zentrum (MLZ), Technische Universität München, Lichtenbergstr. 1, 85748 Garching, Germany
  • 7Institute for Theoretical Physics, Goethe-University Frankfurt, 60438 Frankfurt (M), Germany

  • *m_matsuura@cross.or.jp

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Vol. 123, Iss. 2 — 12 July 2019

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