Fluctuation specific heat and thermal expansion of YBaCuO and DyBaCuO

Schnelle, Walter; Braun, E.; Broicher, H.; Dömel, R.; Ruppel, S.; Braunisch, W.; Harnischmacher, J.; Wohlleben, D.

doi:10.1016/0921-4534(90)90063-k

Cited by 59 publications

(11 citation statements)

References 25 publications

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“…is described in [14]. Zero resistance of this sample is found at 91.8 K. Sample # 3 shows a very low resistivity of (380k60) pQ cm at 100 K (see insert in Fig.…”

Section: Resultsmentioning

confidence: 84%

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Anisotropic coherence lengths of YBa₂Cu₃O_7‐δ from specific heat measurements near T_c

1993

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We present a detailed analysis of high resolution measurements of the specific heat anomalies at the T, of three YBa,Cu,O,-d-samples. The anomalies can be described by the sum of a mean field (MF) step and a contribution from gaussian fluctuations of the order parameter. These fluctuations are threedimensional (3D) near T, and show a crossover to 2D-behaviour some K away from T,. By means of a Lawrence-Doniach type description of the fluctuations we estimate the anisotropic coherence lengths and ti. The values are consistent with data of the fluctuation contribution to the susceptibility above T,. We give data for ACMF and discuss the relevance of critical fluctuations. The influence of the oxygen content 6 on the broadening and splitting of the transition is shown.

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“…is described in [14]. Zero resistance of this sample is found at 91.8 K. Sample # 3 shows a very low resistivity of (380k60) pQ cm at 100 K (see insert in Fig.…”

Section: Resultsmentioning

confidence: 84%

“…The specific heat of sample # 1 and # 3 was also measured by the quasiadiabatic heat pulse method (see [14] and Fig. 4).…”

Section: Specific Heatmentioning

confidence: 99%

Anisotropic coherence lengths of YBa₂Cu₃O_7‐δ from specific heat measurements near T_c

1993

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“…Typical of these are YBa 2 Cu 3 O 7−x (I) (T c = 92 K) [31] and Bi 2 Sr 2 Ca 2 Cu 3 O x (II) (T c = 107 K) [32]. In structures I and II, the term x is a variable.…”

Section: Superconductivity In Planar Cuprate Materialsmentioning

confidence: 98%

Chemical Bonding and Thermodynamics in Superconductivity and Superfluidity

Love

2012

Int J Thermophys

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Superconductivity and superfluidity are physical states that occur in a variety of chemical and physical systems. These physical states share a common type of real, or virtual, chemical bonding. Each of the systems discussed herein contain at least one real, or effective, coordinate covalent bond. This is formed from an electron pair donor species and an electron pair acceptor species. When the electronegativity difference between the electron pair donor and acceptor species is sufficiently small, the resultant coordinate covalent bond density can be substantial. If delocalized, this bond density can result in a significant increase in the electron pair orbital volume relative to that of the parent species, and an increase in the valence shell orbital entropy. In terms of the normalized Gibbs-Helmholtz equation, this results in a concomitant decrease in free energy of the delocalized electronic system. A decrease in free energy to negative values can support a boson state, and superconductivity. A clear example of these principles is the occurrence of superconductivity in the ceramic material, MgB 2 . These generalizations apply to superconducting elements, high temperature superconductors, superconducting alloys, and equivalently to superfluid 4 He.

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“…It was established beyond doubt [132,133,134,135,136] that the anomaly in high T c cuprates differs qualitatively from the BSC prediction. As was stressed by Salamon et al [137] the heat capacity is logarithmic near the transition, and consequently, cannot be adequately treated by the mean-field BCS theory even including the gaussian fluctuations.…”

Section: Specific Heat Anomalymentioning

confidence: 99%

Strong-coupling theory of high-temperature superconductivity

Alexandrov¹

2001

AIP Conference Proceedings

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Fluctuation specific heat and thermal expansion of YBaCuO and DyBaCuO

Cited by 59 publications

References 25 publications

Anisotropic coherence lengths of YBa₂Cu₃O_7‐δ from specific heat measurements near T_c

Anisotropic coherence lengths of YBa₂Cu₃O_7‐δ from specific heat measurements near T_c

Chemical Bonding and Thermodynamics in Superconductivity and Superfluidity

Strong-coupling theory of high-temperature superconductivity

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Fluctuation specific heat and thermal expansion of YBaCuO and DyBaCuO

Cited by 59 publications

References 25 publications

Anisotropic coherence lengths of YBa2Cu3O7‐δ from specific heat measurements near Tc

Anisotropic coherence lengths of YBa2Cu3O7‐δ from specific heat measurements near Tc

Chemical Bonding and Thermodynamics in Superconductivity and Superfluidity

Strong-coupling theory of high-temperature superconductivity

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Anisotropic coherence lengths of YBa₂Cu₃O_7‐δ from specific heat measurements near T_c

Anisotropic coherence lengths of YBa₂Cu₃O_7‐δ from specific heat measurements near T_c