Light-Induced Current Oscillations in the Charge-Ordered State of (TMTTF)2SbF6

Peterseim, Tobias; Dressel, Martin

doi:10.3390/cryst7090278

Crystals

2017

DOI: 10.3390/cryst7090278

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Light-Induced Current Oscillations in the Charge-Ordered State of (TMTTF)2SbF6

Tobias Peterseim

Martin Dressel

Abstract: Below T CO = 157 K the quasi-one-dimensional charge-transfer salt (TMTTF) 2 SbF 6 undergoes a pronounced phase transition to a charge-ordered ground state. We have explored the non-linear and photoconductive behavior as a function of applied voltage, laser pulse energy and temperature. Besides a decay of the photoconductive signal in a double exponential fashion in the millisecond range, we discover current oscillations in the kHz range induced by the application of short laser pulses. While the resonance freq… Show more

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Cited by 3 publications

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“…The existence of Dirac-like electrons in α-(BEDT-TTF) 2 I 3 is another topic that has attracted interest for more than a decade, from a theoretical side [15] as well as from the side of applications [16]. Pressure-dependent experiments are also important for the one-dimensional TMTTF salts, in order to study the charge and anion ordering [17,18].…”

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Advances in Organic Conductors and Superconductors

Dressel¹

2018

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Crystalline conductors and superconductors based on organic molecules are a rapidly progressing field of solid-state science, involving chemists, and experimental and theoretical physicists from all around the world. In focus are solids with electronic properties governed by delocalized π-electrons. Although carbon-based materials of various shades have gained enormous interest in recent years, charge transfer salts are still paradigmatic in this field. Progress in molecular design is achieved via tiny but ingenious modifications, as well as by fundamentally different approaches. The wealth of exciting physical phenomena is unprecedented and could not have been imagined when the field took off almost half a century ago.Organic low-dimensional conductors are prime examples of Luttinger liquids; they exhibit a tendency toward Fermi surface instabilities, but can also be tuned across a dimensionality-driven phase diagram like no other system. Superconductivity comes at the border to ordered phases in the spin and charge sectors, and, at high fields, the Fulde-Ferrell-Larkin-Ovchinnikov (FFLO) state is well established. The interplay between charge and magnetic order is still under debate, but electronic ferroelectricity is well established. After decades of intense research, the spin liquid state was first discovered in organic conductors when the amount of geometrical frustration and electronic correlations is just right. They drive the metal and superconductor into an insulating Mott state, solely via electron-electron interactions. However, what do we know about the effect of disorder? Can we tune the electronic properties by pressure, by light, or by field? Research is still addressing basic questions, but devices are not out of reach. These are currently open questions, as well as hot and timely topics.Although the superconducting transition temperature remains rather moderate for organic materials, the questions addressed are of fundamental importance, and for several topics molecular conductors are by far the best model system for detailed investigations. The spatial modulation of the superconducting order parameter in the Fulde-Ferrell Larkin-Ovchinikov state is certainly one of them [1,2]. The conceptional paper by Otsuka et al. reviews current ideas on the design of a spin-frustrated Mott insulator and points towards future developments in quantum spin liquids [3]. No question, this exciting research topic has placed organic crystals again at the forefront of solid-state physics. The class of β -Et x Me 4−x Z[Pd(dmit) 2 ] 2 with Z = P, As, Sb and x = 0, 1, 2 is a topic of the paper from Ueda et al. [4]. A completely new view on the structural properties of κ-(BEDT-TTF) 2 Cu 2 (CN) 3 is given by Foury-Leylekian and collaborators [5], who found that the compound contains two non-equivalent dimers in the unit cell and charge disproportionation between the dimers. Here, simple facts, assumed to be settled for decades, were revisited, such as the symmetry of a crystal; this laid new ground for the re-interpreta...

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Advances in Organic Conductors and Superconductors

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2018

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One-dimensional electronic systems: metal-chain complexes and organic conductors

Yoshida

Kitagawa

2020

Chem. Commun.

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Switching charge states in quasi-2D molecular conductors

et al. 2022

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Two dimensional (2D) molecular entities build next-generation electronic devices, where abundant elements of organic molecules are attractive due to the modern synthetic and stimuli control through chemical, conformational and electronic modifications in electronics. Despite its promising potential, the insufficient control over charge states and electronic stabilities must be overcome in molecular electronic devices. Here we show the reversible switching of modulated charge states in an exfoliatable two-dimensional layered molecular conductor based on bis(ethylenedithio)tetrathiafulvalene molecular dimers. The multiple stimuli application of cooling rate, current, voltage and laser irradiation in a concurrent manner facilitates the controllable manipulation of charge crystal, glass, liquid, and metal phases. The four orders of magnitude switching of electric resistance are triggered by stimuli-responsive charge distribution among molecular dimers. The tunable charge transport in 2D molecular conductors reveals the kinetic process of charge configurations under stimuli, promising to add electric functions in molecular circuitry.

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Light-Induced Current Oscillations in the Charge-Ordered State of (TMTTF)2SbF6

Cited by 3 publications

References 93 publications

Advances in Organic Conductors and Superconductors

Advances in Organic Conductors and Superconductors

One-dimensional electronic systems: metal-chain complexes and organic conductors

Switching charge states in quasi-2D molecular conductors

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