<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi mathvariant="italic">κ</mml:mi><mml:mi>−</mml:mi><mml:mo>(</mml:mo><mml:mi>BEDT</mml:mi><mml:mi>−</mml:mi><mml:mi>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>Cu</mml:mi><mml:mo>[</mml:mo><mml:mi>N</mml:mi><mml:mo>(</mml:mo><mml:mi>CN</mml:mi><mml:mrow><mml:msub><mml:mrow><mml:mo>)</mml:mo></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mm

Elsinger, H.; Wosnitza, J.; Wanka, S.; Hagel, J.; Schweitzer, Dieter; Strunz, W.

doi:10.1103/physrevlett.84.6098

Cited by 148 publications

(129 citation statements)

References 29 publications

(40 reference statements)

Supporting

Mentioning

112

Contrasting

Order By: Relevance

“…5(b)] [30]. However, by use of the mentioned α model [31] a reasonable description of the data is possible assuming a moderately strong coupling with a gap ratio = (0)/ = 2.18, [32,35,36] in line with reports by other groups [33,37]. These specific-heat results, therefore, prove the existence of a complete superconducting gap and are strictly against any unconventional nodal order parameter.…”

Section: Resultssupporting

confidence: 74%

Emerging evidence for FFLO states in layered organic superconductors (Review Article)

Beyer

Wosnitza

2013

Low Temperature Physics

Self Cite

View full text Add to dashboard Cite

In this short review, we report on the recently found growing experimental evidence for the existence of Fulde-Ferrell-Larkin-Ovchinnikov (FFLO) states in quasi-two-dimensional organic superconductors. At high magnetic fields aligned parallel to the conducting organic layers, we observe an upturn of the upper critical field beyond the Pauli limit, as evidenced by specific-heat and torque-magnetization measurements. Inside the superconducting state a second thermodynamic transition emerges. These features appear only in a very narrow angular region close to parallel-field orientation.

show abstract

Section: Resultssupporting

confidence: 74%

Emerging evidence for FFLO states in layered organic superconductors (Review Article)

Beyer

Wosnitza

2013

Low Temperature Physics

Self Cite

View full text Add to dashboard Cite

show abstract

“…Temperature dependence of the electronic heat capacity was more precisely studied by Elsinger et al [28] [29] for κ-(BEDT-TTF) 2 Cu(NCS) 2 between 2 K and 30 K under 0 T and magnetic fields larger than H c2 . The overall peak shape was analyzed by comparing the α-model of strong coupling superconductors with appropriate parameters of α = 2.7 and α = 2.8, respectively [28,29].…”

Section: K Class Superconductors: κ-(Bedt-ttf) 2 Cu(ncs) 2 and κ-(mentioning

confidence: 99%

“…The heat capacity measurements around T c of κ-type organic superconductors were performed mainly by thermal relaxation calorimetry and also by high-resolution ac calorimetry techniques. Up to now, several groups have reported the heat capacity measurements around T c for κ-(BEDT-TTF) 2 Cu(NCS) 2 and κ-(BEDT-TTF) 2 Cu[N(CN) 2 ]Br [24][25][26][27][28][29], but the temperature region is limited due to the difficulty of getting high-resolution data in the wide temperature range. For the former salt, the normal state electronic heat capacity coefficient γ obtained by applying magnetic fields of 12.5 T gives (25 ± 3) mJ K −2 mol −1 and a heat capacity jump ∆C p T −1 was evaluated as >50 mJ K −2 mol −1 by Andraka et al [24].…”

Section: K Class Superconductors: κ-(Bedt-ttf) 2 Cu(ncs) 2 and κ-(mentioning

confidence: 99%

“…For κ-(BEDT-TTF) 2 Cu[N(CN) 2 ]Br, γ was evaluated as (22 ± 3) mJ K −2 mol −1 by the extrapolation of low temperature heat capacities under 14 T and the heat capacity jump was evaluated as ∆C p /γT c = 2 ± 0.5 from these data [27]. Temperature dependence of the electronic heat capacity was more precisely studied by Elsinger et al [28] [29] for κ-(BEDT-TTF) 2 Cu(NCS) 2 between 2 K and 30 K under 0 T and magnetic fields larger than H c2 . The overall peak shape was analyzed by comparing the α-model of strong coupling superconductors with appropriate parameters of α = 2.7 and α = 2.8, respectively [28,29].…”

Section: K Class Superconductors: κ-(Bedt-ttf) 2 Cu(ncs) 2 and κ-(mentioning

confidence: 99%

See 1 more Smart Citation

Thermodynamic Properties of κ-(BEDT-TTF)2X Salts: Electron Correlations and Superconductivity

Nakazawa

2012

Crystals

View full text Add to dashboard Cite

Abstract:Heat capacity measurements of κ-(BEDT-TTF) 2 X (BEDT-TTF: Bis(ethylendithio) tetrathiafulvalene, X: counteranions) which are classified as two-dimensional (2D) dimer-Mott system are reported. At first, we explain structural and electronic features originated from rigid dimerization in donor arrangement in 2D layers. The antiferromagnetic Mott insulating phase located at low-pressure region in the phase diagram shows vanishing γ electronic heat capacity coefficient in the heat capacity, which claims opening of a charge-gap in this insulating state. Then, a systematic change of the γ around the Mott boundary region is reported in relation to the glass freezing of ethylene dynamics. The thermodynamic parameters determined by ∆C p /γT c of 10 K class superconductors, κ-(BEDT-TTF) 2 Cu(NCS) 2 and κ-(BEDT-TTF) 2 Cu[N(CN) 2 ]Br demonstrate that a rather large gap with a strong coupling character appears around the Fermi-surface. On the other hand, the low temperature heat capacity clearly shows a picture of nodal-gap structure due to an anisotropic pairing. The comparison with lower T c compounds in the κ-type structure is also performed so as to discuss overall features of the κ-type superconductors. The heat capacity measurements of hole-doped systems containing mercury in the counteranions show an anomalous enhancement of γ, which is consistent with the T 1 −1 of NMR experiments etc. The results of heat capacity measurements under high pressures are also reported. OPEN ACCESSCrystals 2012, 2 742

show abstract

“…42,50 The higher frequency peak is located at the frequency Ω 2 , and was calculated for the ET-intramolecular vibrations: Ω 2 = 10meV. 52,54 Given the number of modes present near each peak and their possible coupling to the electrons, we set w 1 = 0.75 and w 2 = 0.25. The coupling constants to each set of modes is then defined as λ j = λw j (j = 1, 2).…”

Section: Layered Organic Superconductorsmentioning

confidence: 99%

Electronic collective modes and superconductivity in layered conductors

2003

View full text Add to dashboard Cite

A distinctive feature of layered conductors is the presence of low-energy electronic collective modes of the conduction electrons. This affects the dynamic screening properties of the Coulomb interaction in a layered material. We study the consequences of the existence of these collective modes for superconductivity. General equations for the superconducting order parameter are derived within the strong-coupling phonon-plasmon scheme that account for the screened Coulomb interaction. Specifically, we calculate the superconducting critical temperature Tc taking into account the full temperature, frequency and wave-vector dependence of the dielectric function. We show that low-energy plasmons may contribute constructively to superconductivity. Three classes of layered superconductors are discussed within our model: metal-intercalated halide nitrides, layered organic materials and high-Tc oxides. In particular, we demonstrate that the plasmon contribution (electronic mechanism) is dominant in the first class of layered materials. The theory shows that the description of so-called "quasi-two-dimensional superconductors" cannot be reduced to a purely 2D model, as commonly assumed. While the transport properties are strongly anisotropic, it remains essential to take into account the screened interlayer Coulomb interaction to describe the superconducting state of layered materials.

show abstract

κ−(BEDT−TTF)2Cu[N(CN)2

Cited by 148 publications

References 29 publications

Emerging evidence for FFLO states in layered organic superconductors (Review Article)

Emerging evidence for FFLO states in layered organic superconductors (Review Article)

Thermodynamic Properties of κ-(BEDT-TTF)2X Salts: Electron Correlations and Superconductivity

Electronic collective modes and superconductivity in layered conductors

Contact Info

Product

Resources

About