Characterization of transport and magnetic properties of a Mott insulator, β<sup>′</sup>-(BEDT-TTF)<sub>2</sub>IBrCl

Uchiyama, Kenichi; Miyashita, M.; Taniguchi, Hiromi; Satoh, Kazuhiko; Môri, N.; Miyagawa, Kazuya; Kanoda, K.; Hedo, Masato; Uwatoko, Yoshiya

doi:10.1051/jp4:2004114092

Cited by 6 publications

(4 citation statements)

References 3 publications

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“…Unfortunately, the small size of the crystals which could be obtained prevented the direct measurement of the conductivity in the single crystals. A pressed pellet was made from the material available, and the conductivity measured in the pellet was 1.7 × 10 –3 S cm –1 at 300 K. This value for the conductivity at room temperature is compatible with the expected Mott insulating behavior. − …”

Section: Resultssupporting

confidence: 58%

Bromide and Tribromide 4-Cyanobenzene-Ethylenedithio-Tetrathiafulvalene Radical Salts by Chemical and Electrochemical Routes

Varatojo

Lopes

Gama

et al. 2019

Crystal Growth & Design

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Two salts of the dissymmetric TTF-derivative 4-cyanobenzene-ethylenedithio-tetrathiafulvalene (4-CNB-EDT-TTF) with bromide and tribromide anions and with different stoichiometries, namely, (1:1) (4-CNB-EDT-TTF)-Br 3 (1) and (4:1) (4-CNB-EDT-TTF) 4 Br (2), were obtained by electrocrystallization and diffusion methods, respectively. The crystal structures of these compounds, as determined by single-crystal X-ray diffraction, are based on head-to-tail donor dimers with ring over ring overlap and donor stack arrangement, interleaved by anions depending on the (1:1) or (4:1) salt, respectively. The 4:1 salt behaves as a Mott insulator. In both salts, the donors are connected to adjacent donors through C−N•••H−C interactions, which can be described as an modified R 2 4 (10)* synthon for 1 and a combination of R 2 2 (10) and R 2 4 (10) synthons for 2.

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Section: Resultssupporting

confidence: 58%

Bromide and Tribromide 4-Cyanobenzene-Ethylenedithio-Tetrathiafulvalene Radical Salts by Chemical and Electrochemical Routes

Varatojo

Lopes

Gama

et al. 2019

Crystal Growth & Design

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“…(6) Typical Mott insulators (l) (T N ¼ 22 K), 44 (m) (T N ¼ 19.5 K), 45 and (n) (T N ¼ 28 K) 44 reside at the lower-le corner in the Mott region. Some of these become superconductors under extremely high pressure with a rather high T c (8.2 GPa, onset T c ¼ 14.2 K for (l), 8.0 GPa, onset T c ¼ 7.2 K for (m)).…”

Section: Design Of Qsl Next To a Superconducting Statementioning

confidence: 99%

“…Some of these become superconductors under extremely high pressure with a rather high T c (8.2 GPa, onset T c ¼ 14.2 K for (l), 8.0 GPa, onset T c ¼ 7.2 K for (m)). 45,47 Mott insulators, which are distantly located from the itinerant region and are not readily converted to a metal or superconductor, exhibit different transport and magnetic properties from those of "so" Mott insulators, as mentioned above, and are denoted as "hard" Mott insulators.…”

Section: Design Of Qsl Next To a Superconducting Statementioning

confidence: 99%

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Quantum spin liquid: design of a quantum spin liquid next to a superconducting state based on a dimer-type ET Mott insulator

et al. 2015

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The existence of a spin-disordered quantum state was predicted theoretically by Wannier in 1950 and Anderson in 1973. Various target materials had been considered before the discovery in 2003 of the first quantum spin liquid (QSL) system: a Mott insulator κ-(ET) 2 Cu 2 (CN) 3 , where ET is bis(ethylenedithio)tetrathiafulvalene. The family of dimer-type ET conductors κ-(ET) 2 X (where X = an anion) exhibits various conduction profiles ranging from insulators to metals to superconductors depending on the counter anion. In κ-(ET) 2 X, the anion molecules form characteristic patterns of anion openings, on each of which an ET dimer corresponding to a single spin site is positioned, namely a key-keyhole relation.The topological consideration of the crystal structure affords the information on both a spin geometry (t'/t) and electron correlation (U/W), where t and t' are interdimer transfer interactions with an isosceles triangular geometry, and U and W are the on-site Coulomb repulsion energy and bandwidth, respectively. The QSL system κ-(ET) 2 Cu 2 (CN) 3 is characterized by a spin lattice containing nearly equilateral triangles (t'/t = 1.09) with strong electron correlations (U/W = 0.93) at room temperature. The temperature dependences of t'/t and U/W are bases to understand the transport and magnetic behaviors of κ-(ET) 2 X. κ-(ET) 2 Cu 2 (CN) 3 has a superconducting state next to the QSL state under pressure without passing through an antiferromagnetic state. Here, the design of QSL systems next to a superconducting state is discussed based on the crystal and the electronic structures and physical properties of κ-(ET) 2 X using the key-keyhole relation and temperature variant band parameters t, t', U, and W.

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Organic superconductors

Saito

Yoshida

2011

The Chemical Record

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The present status of organic superconductors of charge-transfer (CT) type based on donor molecules is reviewed. Along with the superconducting phases of such materials and also of oxide superconductors, reside spin-ordered phases such as spin-density wave (SDW) and antiferromagnetic (AF) phases. We briefly describe the recent development of superconductors having a superconducting phase next to a spin-disorder state (quantum spin liquid state). In addition to the CT type superconductors, there are a few single-component superconductors under high pressure.

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Characterization of transport and magnetic properties of a Mott insulator, β^′-(BEDT-TTF)₂IBrCl

Cited by 6 publications

References 3 publications

Bromide and Tribromide 4-Cyanobenzene-Ethylenedithio-Tetrathiafulvalene Radical Salts by Chemical and Electrochemical Routes

Bromide and Tribromide 4-Cyanobenzene-Ethylenedithio-Tetrathiafulvalene Radical Salts by Chemical and Electrochemical Routes

Quantum spin liquid: design of a quantum spin liquid next to a superconducting state based on a dimer-type ET Mott insulator

Organic superconductors

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Characterization of transport and magnetic properties of a Mott insulator, β′-(BEDT-TTF)2IBrCl

Cited by 6 publications

References 3 publications

Bromide and Tribromide 4-Cyanobenzene-Ethylenedithio-Tetrathiafulvalene Radical Salts by Chemical and Electrochemical Routes

Bromide and Tribromide 4-Cyanobenzene-Ethylenedithio-Tetrathiafulvalene Radical Salts by Chemical and Electrochemical Routes

Quantum spin liquid: design of a quantum spin liquid next to a superconducting state based on a dimer-type ET Mott insulator

Organic superconductors

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Product

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Characterization of transport and magnetic properties of a Mott insulator, β^′-(BEDT-TTF)₂IBrCl