Thermodynamics of D-wave pairing in cuprate superconductors

Kruchinin, S. P.; Patapis, S.K.

doi:10.1007/bf00768469

Cited by 15 publications

(10 citation statements)

References 10 publications

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“…The temperature dependence of electronic heat capacity shows quadratic temperature dependences in all compounds at extremely low temperature region below 2 K. The results imply that the superconductivity of the κ-type superconductors has common feature of nodal gap and the superconductive state is considered as an unconventional d-wave, 21,22 although the coupling strength may change from high-T c region to low-T c region in the phase diagram. The superconductive transition of the nonstoichiometric compound shows superconductivity detectable by heat capacity but it is not a bulk superconductor to give large residual heat capacity coefficient γ * in low temperature heat capacity.…”

Section: Discussionmentioning

confidence: 90%

Quadratic temperature dependence of electronic heat capacities in the κ-type organic superconductors

Imajo

Akutsu

Nakazawa

2016

Int. J. Mod. Phys. B

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We carried out a systematic measurement and data analysis of low-temperature heat capacities of three BEDT-TTF-based superconductive compounds with κ-type structure, where BEDT-TTF is bis(ethylenedithio)tetrathiafulvalene so as to compare the character of the quasi-particle excitations reflected in the electronic heat capacity. We used an original relaxation calorimetry cell with much reduced addenda heat capacity as compared with previous works. The three compounds, κ-(BEDT-TTF) 2 Cu(NCS) 2 , κ-(BEDT-TTF) 2 Ag(CN) 2 H 2 O, κ-(BEDT-TTF) 4 Hg 2.89 Br 8 show distinct quadratic temperature dependence in their electronic heat capacity obtained by subtracting normal states data obtained by applying magnetic fields from the 0 T data. The line-nodal gap due to d-wave pairing symmetry is suggested as common phenomena of the superconductivity of the κ-type compounds.

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Section: Discussionmentioning

confidence: 90%

Quadratic temperature dependence of electronic heat capacities in the κ-type organic superconductors

Imajo

Akutsu

Nakazawa

2016

Int. J. Mod. Phys. B

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“…Spin Fluctuations The authors of works [42][43][44][45] proposed a continual model for the spin-fluctuation mechanism of pairing which allows one to efficiently solve the problem of thermodynamics for this mechanism.…”

Section: Continual Model Of Antiferromagneticmentioning

confidence: 99%

“…where F p = k i n 2 − p − 2 After some calculations and transformations, we get the general formula for the superconducting parameter: [43][44][45] Re k…”

Section: Equation For Superconducting Gapmentioning

confidence: 99%

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Physics of High-T_c Superconductors

Kruchinin¹,

Nagao²,

Aono³

2010

Modern Aspects of Superconductivity

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Studies in the field of superconductivity theory is one of the most bright, fruitful, and promising trends in the theoretical physics of condensed matter, since superconductivity remains to be one of the most interesting research areas in physics. In this review consider such topics of high-T c superconductivity as the structures of high-T c superconductors, phase diagrams, and the problem of pseudogaps and analyze the mechanisms of superconductivity. We present general arguments as for the pairing symmetry in cuprate superconductors and investigate their thermodynamical properties within the spin-fluctuation mechanism of superconductivity, by using the method of functionals. This review deals with a wide scope of theoretical and experimental topics in superconductivity.

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“…From a Ginzburg-Landau formalism, the case of d-wave pairing effects on the thermodynamics of cuprate superconductors taking account antiferromagnetic fluctuations has been studied in, e.g., Ref. 24. On the other hand, in a previous work, 25 we have studied the influence of a logarithmic VHS in the electronic density of states on the mean-field electronic specific heat C e,m f of a strictly two-dimensional ͑2D͒ superconductor.…”

Section: Introductionmentioning

confidence: 99%

Electronic specific heat of superconductors with Van Hove singularities: Effects of a magnetic field and thermal fluctuations

Dorbolo

Ausloos

Houssa³

1998

Phys. Rev. B

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The mean-field electronic specific heat of a superconductor in the presence of a magnetic field is calculated. We consider an energy spectrum presenting saddle points in the band structure. They correspond to Van Hove singularities in the density of states. We use a three-dimensional band structure by introducing a coupling energy between the CuO 2 planes. Both s-wave and d-wave energy-gap-parameter cases are investigated. It is noticed that the specific-heat jump should increase or decrease with the field, respectively. It is found that the d-wave model seems to be qualitatively and quantitatively more realistic. The influence of a magnetic field on the jump of the electronic specific heat of various high-T c superconductors such as YBa 2 Cu 3 O 7Ϫx , HgBa 2 Ca 2 Cu 3 O 8 , and Tl 2 Ba 2 CuO 6ϩ␦ near T c is compared to mean-field results. Fluctuations are extracted and analyzed. It is pointed out that the mean-field background should be extracted before analyzing the fluctuations. Critical fluctuation regimes, Gaussian, lowest Landau level, and XY regimes as well as the effective dimensionality of the systems are obtained. The field regimes are given on the T c line.

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Thermodynamics of D-wave pairing in cuprate superconductors

Cited by 15 publications

References 10 publications

Quadratic temperature dependence of electronic heat capacities in the κ-type organic superconductors

Quadratic temperature dependence of electronic heat capacities in the κ-type organic superconductors

Physics of High-T_c Superconductors

Electronic specific heat of superconductors with Van Hove singularities: Effects of a magnetic field and thermal fluctuations

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Thermodynamics of D-wave pairing in cuprate superconductors

Cited by 15 publications

References 10 publications

Quadratic temperature dependence of electronic heat capacities in the κ-type organic superconductors

Quadratic temperature dependence of electronic heat capacities in the κ-type organic superconductors

Physics of High-Tc Superconductors

Electronic specific heat of superconductors with Van Hove singularities: Effects of a magnetic field and thermal fluctuations

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Physics of High-T_c Superconductors