Superconductor-insulator phase transformation of partially deuterated<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>κ</mml:mi><mml:mo>−</mml:mo><mml:mo>(</mml:mo><mml:mi mathvariant="normal">BEDT</mml:mi><mml:mo>−</mml:mo><mml:mi mathvariant="normal">TTF</mml:mi><mml:mrow><mml:msub><mml:mrow><mml:mo>)</mml:mo></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub></mml:mrow><mml:mi mathvariant="normal">Cu</mml:mi><mml:mo>[</mml:mo><mml:mi mathvariant="normal">N</mml

Taniguchi, Hiromi; Kawamoto, Atsushi; Kanoda, K.

doi:10.1103/physrevb.59.8424

Cited by 62 publications

(96 citation statements)

References 19 publications

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“…The maximum of ͑T 1 T͒ −1 shifts to higher temperature when pressure is applied and spin susceptibility is decreased and the electrical conductivity is significantly increased. 5,15,24 In contrast, there was no significant anomaly of spin susceptibility and the electrical conductivity at that temperature in this salt.…”

mentioning

confidence: 64%

Non-Fermi-liquid behavior of the organic superconductorκ−(BEDT-TTF)4Hg2.89Br
Eto
¹
,
Itaya
²
,
Kawamoto
³

2010
Phys. Rev. B
15
4
5
1
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An organic salt, -͑BEDT-TTF͒ 4 Hg 2.89 Br 8 exhibits superconductivity at 4.3 K under ambient pressure suggesting non-Fermi-liquid ͑NFL͒ behavior just above T c . Whereas most organic superconductors are controlled by the bandwidth in the half-filled electron system, this salt realizes a carrier doping away from the half-filled electron system as well as high-T c cuprates. In order to investigate the origin of NFL behavior, we assessed 13 C-NMR measurements in this salt and observed the antiferromagnetic fluctuation as same as in an organic antiferromagnet -͑BEDT-TTF͒ 2 Cu͓N͑CN͒ 2 ͔Cl with the gap structure. Application of pressure suppresses ͑T 1 T͒ −1 and shifts its maximum to lower temperatures with ͑T 1 T͒ −1 becoming constant above 2 GPa. These results suggest that applying pressure alters the electron system from NFL to FL state and that antiferromagnetic fluctuations contribute to the origin of NFL behavior. The physics of organic conductors involve a strongly correlated electron system, similar to that of high-T c cuprates and heavy-fermion systems.1 For example, bis͑ethylenedithio͒-tetrathiafulvalene ͑BEDT-TTF͒, together with inorganic ions, forms many conducting salts, which have various crystal structures. Although the conducting layers of all of these salts consist of the same molecule, these salts show a variety of behavior, from superconductivity to high-resistance insulator.2 These salts can also be classified by the arrangement of their BEDT-TTF molecules with the arrangement and the electronic properties being closely related. In -͑BEDT-TTF͒ 2 X, two BEDT-TTF molecules form a dimer and constitute a two-dimensional conducting sheet, with one electron per dimer.3 Hence -͑BEDT-TTF͒ 2 X is regarded as a two-dimensional half-filled electron system. Many -͑BEDT-TTF͒ 2 X salts act as superconductors with the superconducting and antiferromagnetic insulating phases being adjacent to or coexisting at low temperatures. 5,6 Therefore, these salts are ideal for investigating the relationship between superconductivity and antiferromagnetism.Carrier doping and applying pressure are complementary methods for research on the phase diagram. Whereas high-T c cuprates showed superconductivity after carrier doping, many organic superconductors showed superconductivity after applying pressure.7 Cuprates and -͑BEDT-TTF͒ 2 X show both similarities and dissimilarities. Despite differences in their ionic and molecular crystals, cuprates and -͑BEDT-TTF͒ 2 X have similar properties, in that their superconductive and antiferromagnetic phases are neighboring, and the order parameter of the superconductivity has d-wave symmetry.8-13 Just above T c , -type salts show Fermi-liquid ͑FL͒ behavior, as shown by their conductivity, spin susceptibility and ͑T 1 T͒ −1 , 5,14,15 whereas high-T c cuprates show non-Fermi-liquid ͑NFL͒ behavior just above T c . To investigate the origin of those similarities and dissimilarities, it is important to assess the material that connects cuprates and -͑BEDT-TTF͒ 2 X. Since carrier doping to organ...

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mentioning

confidence: 64%

Non-Fermi-liquid behavior of the organic superconductorκ−(BEDT-TTF)4Hg2.89Br
Eto
¹
,
Itaya
²
,
Kawamoto
³

2010
Phys. Rev. B
15
4
5
1
View full text Add to dashboard Cite

show abstract

“…Some physical quantities such as superconducting T c significantly depend on the cooling rate. 23 Theoretically, this type of disorder can be a pair breaker of superconductivity, 24 and modifies the intra-dimer Coulomb interaction. 25 We performed dielectric measurements with different cooling rates ranging from 0.5 to 10 K/min, and found that the data were essentially the same as in Fig.…”

Section: Resultsmentioning

confidence: 99%

Anomalous dielectric response in the dimer Mott insulatorκ−(BEDT-TTF)2Cu2(CN
Abdel‐Jawad¹,
Terasaki²,
Sasaki³
et al. 2010
Phys. Rev. B
177
23
179
0
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We have measured and analyzed the dielectric constant of the dimer Mott insulator κ−(BEDT-TTF)2Cu2(CN)3, which is known as a playground for a spin-liquid state. Most unexpectedly, this particular organic salt has nontrivial charge degrees of freedom, being characterized by a relaxor-like dielectric relaxation below around 60 K. This is ascribed to the charge disproportionation within the dimer due to the intersite Coulomb repulsion. A possible microscopic model is suggested and discussed.

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“…The drop of the electrical resistance at T c = 11.6 K, accompanied by a very small kink (indicated by an arrow) in α b (T ), are fingerprints of percolative SC in small portions of the sample volume coexisting with the AF ordered insulating state, see e.g. [109]. In the temperature window 12 K T 16 K, jumps in the electrical resistance are noticeable.…”

Section: Magnetic Field Effects On κ-D8-brmentioning

confidence: 97%

Probing the Mott physics inκ-(BEDT-TTF)₂X salts via thermal expansion

Souza

Bartosch

2015

J. Phys.: Condens. Matter

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In the field of interacting electron systems the Mott metal-to-insulator (MI) transition represents one of the pivotal issues. The role played by lattice degrees of freedom for the Mott MI transition and the Mott criticality in a variety of materials are current topics under debate. In this context, molecular conductors of the κ-(BEDT-TTF) 2 X type constitute a class of materials for unraveling several aspects of the Mott physics. In this review, we present a synopsis of literature results with focus on recent expansivity measurements probing the Mott MI transition in this class of materials. Progress in the description of the Mott critical behavior is also addressed.

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Superconductor-insulator phase transformation of partially deuteratedκ−(BEDT−TTF)2Cu[N

Cited by 62 publications

References 19 publications

Non-Fermi-liquid behavior of the organic superconductorκ−(BEDT-TTF)4Hg2.89Br
Eto
¹
,
Itaya
²
,
Kawamoto
³

2010
Phys. Rev. B
15
4
5
1
View full text Add to dashboard Cite

Non-Fermi-liquid behavior of the organic superconductorκ−(BEDT-TTF)4Hg2.89Br
Eto
¹
,
Itaya
²
,
Kawamoto
³

2010
Phys. Rev. B
15
4
5
1
View full text Add to dashboard Cite

Anomalous dielectric response in the dimer Mott insulatorκ−(BEDT-TTF)2Cu2(CN
Abdel‐Jawad¹,
Terasaki²,
Sasaki³
et al. 2010
Phys. Rev. B
177
23
179
0
View full text Add to dashboard Cite

Probing the Mott physics inκ-(BEDT-TTF)₂X salts via thermal expansion

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Superconductor-insulator phase transformation of partially deuteratedκ−(BEDT−TTF)2Cu[N

Cited by 62 publications

References 19 publications

Non-Fermi-liquid behavior of the organic superconductorκ−(BEDT-TTF)4Hg2.89BrEto1, Itaya2, Kawamoto3 2010Phys. Rev. B15451View full textAdd to dashboardCite

Non-Fermi-liquid behavior of the organic superconductorκ−(BEDT-TTF)4Hg2.89BrEto1, Itaya2, Kawamoto3 2010Phys. Rev. B15451View full textAdd to dashboardCite

Anomalous dielectric response in the dimer Mott insulatorκ−(BEDT-TTF)2Cu2(CNAbdel‐Jawad1, Terasaki2, Sasaki3 et al. 2010Phys. Rev. B177231790View full textAdd to dashboardCite

Probing the Mott physics inκ-(BEDT-TTF)2X salts via thermal expansion

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Non-Fermi-liquid behavior of the organic superconductorκ−(BEDT-TTF)4Hg2.89Br
Eto
¹
,
Itaya
²
,
Kawamoto
³

2010
Phys. Rev. B
15
4
5
1
View full text Add to dashboard Cite

Non-Fermi-liquid behavior of the organic superconductorκ−(BEDT-TTF)4Hg2.89Br
Eto
¹
,
Itaya
²
,
Kawamoto
³

2010
Phys. Rev. B
15
4
5
1
View full text Add to dashboard Cite

Anomalous dielectric response in the dimer Mott insulatorκ−(BEDT-TTF)2Cu2(CN
Abdel‐Jawad¹,
Terasaki²,
Sasaki³
et al. 2010
Phys. Rev. B
177
23
179
0
View full text Add to dashboard Cite

Probing the Mott physics inκ-(BEDT-TTF)₂X salts via thermal expansion