Lattice Dynamics Coupled to Charge and Spin Degrees of Freedom in the Molecular Dimer-Mott Insulator κ- (BEDT-TTF)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; Michael Lang

doi:10.1103/PhysRevLett.123.027601

Lattice Dynamics Coupled to Charge and Spin Degrees of Freedom in the Molecular Dimer-Mott Insulator κ- (BEDT-TTF)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, Michael Lang

IMR - Materials Property Division

Research output: Contribution to journal › Article › peer-review

10 Citations (Scopus)

Abstract

Inelastic neutron scattering measurements on the molecular dimer-Mott insulator κ-(BEDT-TTF)2Cu[N(CN)2]Cl reveal a phonon anomaly in a wide temperature range. Starting from Tins∼50-60 K where the charge gap opens, the low-lying optical phonon modes become overdamped upon cooling towards the antiferromagnetic ordering temperature TN=27 K, where also a ferroelectric ordering at TFE≈TN 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.

Original language	English
Article number	027601
Journal	Physical Review Letters
Volume	123
Issue number	2
DOIs	https://doi.org/10.1103/PhysRevLett.123.027601
Publication status	Published - 2019 Jul 10

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Matsuura, M., Sasaki, T., Iguchi, S., Gati, E., Müller, J., Stockert, O., Piovano, A., Böhm, M., Park, J. T., Biswas, S., Winter, S. M., Valentí, R., Nakao, A., & Lang, M. (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), Article 027601. https://doi.org/10.1103/PhysRevLett.123.027601

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

abstract = "Inelastic neutron scattering measurements on the molecular dimer-Mott insulator κ-(BEDT-TTF)2Cu[N(CN)2]Cl reveal a phonon anomaly in a wide temperature range. Starting from Tins∼50-60 K where the charge gap opens, the low-lying optical phonon modes become overdamped upon cooling towards the antiferromagnetic ordering temperature TN=27 K, where also a ferroelectric ordering at TFE≈TN 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.",

author = "Masato Matsuura and Takahiko Sasaki and Satoshi Iguchi and Elena Gati and Jens M{\"u}ller and Oliver Stockert and Andrea Piovano and Martin B{\"o}hm and Park, {Jitae T.} and Sananda Biswas and Winter, {Stephen M.} and Roser Valent{\'i} and Akiko Nakao and Michael Lang",

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year = "2019",

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doi = "10.1103/PhysRevLett.123.027601",

language = "English",

volume = "123",

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Matsuura, M, Sasaki, T , Iguchi, S, Gati, E, Müller, J, Stockert, O, Piovano, A, Böhm, M, Park, JT, Biswas, S, Winter, SM, Valentí, R, Nakao, A & Lang, M 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, vol. 123, no. 2, 027601. https://doi.org/10.1103/PhysRevLett.123.027601

TY - JOUR

T1 - Lattice Dynamics Coupled to Charge and Spin Degrees of Freedom in the Molecular Dimer-Mott Insulator κ- (BEDT-TTF)2Cu [N (CN)2] Cl

AU - Matsuura, Masato

AU - Sasaki, Takahiko

AU - Iguchi, Satoshi

AU - Gati, Elena

AU - Müller, Jens

AU - Stockert, Oliver

AU - Piovano, Andrea

AU - Böhm, Martin

AU - Park, Jitae T.

AU - Biswas, Sananda

AU - Winter, Stephen M.

AU - Valentí, Roser

AU - Nakao, Akiko

AU - Lang, Michael

PY - 2019/7/10

Y1 - 2019/7/10

N2 - Inelastic neutron scattering measurements on the molecular dimer-Mott insulator κ-(BEDT-TTF)2Cu[N(CN)2]Cl reveal a phonon anomaly in a wide temperature range. Starting from Tins∼50-60 K where the charge gap opens, the low-lying optical phonon modes become overdamped upon cooling towards the antiferromagnetic ordering temperature TN=27 K, where also a ferroelectric ordering at TFE≈TN 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.

AB - Inelastic neutron scattering measurements on the molecular dimer-Mott insulator κ-(BEDT-TTF)2Cu[N(CN)2]Cl reveal a phonon anomaly in a wide temperature range. Starting from Tins∼50-60 K where the charge gap opens, the low-lying optical phonon modes become overdamped upon cooling towards the antiferromagnetic ordering temperature TN=27 K, where also a ferroelectric ordering at TFE≈TN 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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Lattice Dynamics Coupled to Charge and Spin Degrees of Freedom in the Molecular Dimer-Mott Insulator κ- (BEDT-TTF)2Cu [N (CN)2] Cl

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