Tuning Charge Order in $κ$-(BEDT-TTF)$_2$Hg(SCN)$_2$X (X=Br, Cl) via Uniaxial Strain
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arXiv
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| Format: | Preprint |
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2025
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| _version_ | 1866916039075299328 |
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| author | Liebman, Jesse Torunova, Svetlana Schlueter, John A. Zhilyaeva, Elena Drichko, Natalia |
| author_facet | Liebman, Jesse Torunova, Svetlana Schlueter, John A. Zhilyaeva, Elena Drichko, Natalia |
| contents | In condensed matter physics, experimental control over material properties reflects a deep understanding of the underlying physics. In recent years, meaningful progress has been made towards a description of the physics of correlated electron systems, but examples of control of these systems remain rare. In this work, we confirm a phase diagram theoretically proposed for organic Mott insulators. We use $κ$-(BEDT-TTF)$_2$Hg(SCN)$_2$X (X=Br,Cl) (BEDT-TTF = bis(ethylenedithio)tetrathiafuvalene) materials as experimental realization of the proposed model and demonstrate the ability to tune them both ways across a phase border between a Mott insulator with a uniformly distributed charge and a charge ordered state through the application of uniaxial strain. We induce charge order at 33 K in the quantum dipole liquid material $κ$-(BEDT-TTF)$_2$Hg(SCN)$_2$Br through the application of tensile strain of 0.4% along the c-axis. We suppress charge order down to 10 K in $κ$-(BEDT-TTF)$_2$Hg(SCN)$_2$Cl by applying a tensile strain of 1.6% along the b-axis. We use Raman scattering spectroscopy to probe the charge state through analysis of charge sensitive molecular vibrations and a low frequency mode of collective dipole fluctuations close to the phase border. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2503_11547 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Tuning Charge Order in $κ$-(BEDT-TTF)$_2$Hg(SCN)$_2$X (X=Br, Cl) via Uniaxial Strain Liebman, Jesse Torunova, Svetlana Schlueter, John A. Zhilyaeva, Elena Drichko, Natalia Strongly Correlated Electrons In condensed matter physics, experimental control over material properties reflects a deep understanding of the underlying physics. In recent years, meaningful progress has been made towards a description of the physics of correlated electron systems, but examples of control of these systems remain rare. In this work, we confirm a phase diagram theoretically proposed for organic Mott insulators. We use $κ$-(BEDT-TTF)$_2$Hg(SCN)$_2$X (X=Br,Cl) (BEDT-TTF = bis(ethylenedithio)tetrathiafuvalene) materials as experimental realization of the proposed model and demonstrate the ability to tune them both ways across a phase border between a Mott insulator with a uniformly distributed charge and a charge ordered state through the application of uniaxial strain. We induce charge order at 33 K in the quantum dipole liquid material $κ$-(BEDT-TTF)$_2$Hg(SCN)$_2$Br through the application of tensile strain of 0.4% along the c-axis. We suppress charge order down to 10 K in $κ$-(BEDT-TTF)$_2$Hg(SCN)$_2$Cl by applying a tensile strain of 1.6% along the b-axis. We use Raman scattering spectroscopy to probe the charge state through analysis of charge sensitive molecular vibrations and a low frequency mode of collective dipole fluctuations close to the phase border. |
| title | Tuning Charge Order in $κ$-(BEDT-TTF)$_2$Hg(SCN)$_2$X (X=Br, Cl) via Uniaxial Strain |
| topic | Strongly Correlated Electrons |
| url | https://arxiv.org/abs/2503.11547 |