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

Matsuura, M., Sasaki, T., Iguchi, S., Gati, E., Müller, J., Stockert, O., et al. (2019). Lattice Dynamics Coupled to Charge and Spin Degrees of Freedom in the Molecular Dimer-Mott Insulator κ-(BEDT-TTF)2Cu[N(CN)2]Cl. Physical Review Letters, 123(2): 027601, pp. 1-6. doi:10.1103/PhysRevLett.123.027601.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0004-765C-1 Version Permalink: http://hdl.handle.net/21.11116/0000-0004-7A4A-1
Genre: Journal Article

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 Creators:
Matsuura, Masato1, Author
Sasaki, Takahiko1, Author
Iguchi, Satoshi1, Author
Gati, Elena1, Author
Müller, Jens1, Author
Stockert, Oliver2, Author              
Piovano, Andrea1, Author
Böhm, Martin1, Author
Park, Jitae T.1, Author
Biswas, Sananda1, Author
Winter, Stephen M.1, Author
Valentí, Roser1, Author
Nakao, Akiko1, Author
Lang, Michael1, Author
Affiliations:
1External Organizations, ou_persistent22              
2Physics of Correlated Matter, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863445              

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 Abstract: Inelastic neutron scattering measurements on the molecular dimer-Mott insulator kappa-(BEDT-TTF)(2)Cu[N(CN)(2)]Cl reveal a phonon anomaly in a wide temperature range. Starting from T-ins similar to 50-60 K where the charge gap opens, the low-lying optical phonon modes become overdamped upon cooling towards the antiferromagnetic ordering temperature T-N = 27 K, where also a ferroelectric ordering at T-FE approximate to T-N occurs. Conversely, the phonon damping becomes small again when spins and charges are ordered below T-N, while no change of the lattice symmetry is observed across T-N 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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Language(s): eng - English
 Dates: 2019-07-102019-07-10
 Publication Status: Published in print
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Title: Physical Review Letters
  Abbreviation : Phys. Rev. Lett.
Source Genre: Journal
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Publ. Info: Woodbury, N.Y. : American Physical Society
Pages: - Volume / Issue: 123 (2) Sequence Number: 027601 Start / End Page: 1 - 6 Identifier: ISSN: 0031-9007
CoNE: https://pure.mpg.de/cone/journals/resource/954925433406_1