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Wosnitza, J.; Liu, Xiao; Schweitzer, Dieter; Keller, Heimo J.

doi:10.1103/physrevb.50.12747

Cited by 59 publications

(34 citation statements)

References 25 publications

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“…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: 73%

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

Beyer

Wosnitza

2013

Low Temperature Physics

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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.

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Section: Resultssupporting

confidence: 73%

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

Beyer

Wosnitza

2013

Low Temperature Physics

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“…2 i s o b t a i n e d in excellent agreement with a value of (18.9 ± 2) mJ K -2 mol-1 obtained by a specific heat measurement [9].…”

Section: Resultssupporting

confidence: 69%

“…[6a and 9]) perfectly follows the (1/ cos Θ)-law as expected for a cylindrical Fermi surface of a 2D electronic system. Furthermore, from dHvA experiments at 12 T and measurements of the specific heat [9] it was shown that up to 12 T K-(BEDT-TTF) 2 I3 can be described very well by the 2D free electron model. Therefore, it is surprising that for Θ = 0° in fields above 12 T the effective mass m* continuously decreases with increasing magnetic field.…”

Section: Discussionmentioning

confidence: 99%

Magnetic Field Dependent Effective Mass in the Organic Superconductor κ-(BEDT-TTF)₂I₃

et al. 1995

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K-(BEDT-TTF)213 is an electronically extreme two-dimensional organic metal with a superconducting transition at around 4 K. In magnetic fields above 12 T the effective mass, as obtained from the temperature dependence of the amplitudes of Shubnikov-de Haas oscillations, is magnetic field dependent as long as the magnetic field is arranged perpendicular to the conducting planes. In contrast to this, by turning the magnetic field by 27°o r even only 9° the observed effective mass (as obtained from Shubnikovde Haas and de Haas-van Alphen measurements) is field independent. We suppose that the occurrence of anyons at temperatures below 1 K in fields above 12 T is the reason for the observed field dependence of the effective mass.

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“…Similar to the case where the external pressure increases, counter-ions with smaller volumes change the features from a strong correlation system to a normal metallic system. Many thermodynamic studies by heat capacity measurements of several κ-type compounds with different counter-ions have been performed up to now [49][50][51][52][53][54][55][56][57][58][59][60]. As mentioned in the previous section, the strong coupling nature of κ-(BEDT-TTF) 2 Cu(NCS) 2 has been observed in 10 K class superconductors (Figures 4c and 8).…”

Section: Chemical Pressure Effect On Dimer-mott Organic Compoundsmentioning

confidence: 96%

Thermodynamic Picture of Dimer-Mott Organic Superconductors Revealed by Heat Capacity Measurements with External and Chemical Pressure Control

et al. 2018

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This article reviews and discusses the thermodynamic properties of dimer-Mott-type molecular superconductive compounds with (BEDT-TTF) 2 X composition, where BEDT-TTF is bis(ethylenedithio)tetrathiafulvalene and X denotes counter-anions, respectively. We focus mainly on the features occurring in the κ-type structure in which the d-wave superconductive phase appears depending on the Coulomb repulsion U and the bandwidth W, which is tunable by external and chemical pressures. First, we report the high-pressure ac (alternating current) calorimetry technique and experimental system constructed to measure single-crystal samples of molecule-based compounds to derive low-temperature thermodynamic parameters. Using extremely small resistance chips as a heater and a thermometer allows four-terminal detection of an accurate temperature and its oscillation in the sample part with sufficient sensitivity. From the analyses of the temperature dependence of the ac heat capacity of κ-(BEDT-TTF) 2 Cu(NCS) 2 under external pressures, we discuss the changes in the peak shape of the thermal anomaly at the superconductive transition temperature T c at various external pressures p. The rather sharp peak in C p T −1 at T c = 9.1 K with a strong coupling character at ambient pressure is gradually reduced to weaker coupling as the pressure increases to 0.45 GPa concomitant with suppression of the transition temperature. This feature is compared with the systematic argument of the chemical-pressure effect on the basis of thermal anomalies around the superconductive transition of κ-(BEDT-TTF) 2 X compounds and other previously studied typical dimer-Mott 2:1 compounds. Finally, the discussion is extended to the chemical pressure effect on the normal state electronic heat capacity coefficient γ obtained by applying magnetic fields higher than H c2 and the residual γ*, which remains in the superconductive state due to the induced electron density of states around the node structure. From the overall arguments with respect to both chemical and external pressures, we suggest that a crossover of the electronic state inside the superconductive phase occurs and the coupling strength of electron pairs varies from the electron correlation region near the metal-insulator boundary to the band picture region.

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Specific heat of the organic superconductor κ-(BEDT-TTF)2I3

Cited by 59 publications

References 25 publications

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

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

Magnetic Field Dependent Effective Mass in the Organic Superconductor κ-(BEDT-TTF)₂I₃

Thermodynamic Picture of Dimer-Mott Organic Superconductors Revealed by Heat Capacity Measurements with External and Chemical Pressure Control

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Specific heat of the organic superconductor κ-(BEDT-TTF)2I3

Cited by 59 publications

References 25 publications

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

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

Magnetic Field Dependent Effective Mass in the Organic Superconductor κ-(BEDT-TTF)2I3

Thermodynamic Picture of Dimer-Mott Organic Superconductors Revealed by Heat Capacity Measurements with External and Chemical Pressure Control

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Magnetic Field Dependent Effective Mass in the Organic Superconductor κ-(BEDT-TTF)₂I₃