Order-parameter-fluctuation effects on the thermoelectric power above the superconducting transition in polycrystallineYBa2Cu3O7−δ

1993 ◽  
Vol 47 (9) ◽  
pp. 5332-5350 ◽  
Author(s):  
O. Cabeza ◽  
A. Pomar ◽  
A. Díaz ◽  
C. Torrón ◽  
J. A. Veira ◽  
...  
Keyword(s):  
Thermoelectric Power ◽  
Order Parameter ◽  
Parameter Fluctuation ◽  
Superconducting Transition ◽  
Fluctuation Effects

High Frequency Resistivity in YBa2Cu3O7-δ: Effects of Anisotropic Renormalized Fluctuations

1999 ◽  
Vol 13 (09n10) ◽  
pp. 1097-1100 ◽  
Author(s):  
D. Neri ◽  
R. Marcon ◽  
E. Silva ◽  
R. Fastampa ◽  
L. Iacobucci ◽  
...  
Keyword(s):  
High Frequency ◽  
Order Parameter ◽  
Parameter Fluctuation ◽  
Superconducting Transition ◽  
High Temperature Region ◽  
Linear Temperature ◽  
Microwave Frequencies ◽  
Fundamental Parameters ◽  
Microwave Resistivity ◽  
24 Ghz

We discuss the excess conductivity above Tc due to renormalized order-parameter fluctuation in YBCO at microwave frequencies. We show that a phenomenological cut-off in the fluctuative spectrum can extend the results of the anisotropic theory of renormalized fluctuations up to the high temperature region. Measurements of the real part of the microwave resistivity at 24 GHz are performed on two YBCO films. The onset of the superconducting transition and the deviation from the linear temperature behavior can be fully accounted for by the extended theory. Very consistent values of the fundamental parameters (critical temperature, coherence lenghts, penetration depth) of the superconducting state are obtained.

Thermoelectric Power and an Order-Parameter Associated with the Phase Transition at 180 K of the Organic Metal, (DMET)2Au(CN)2

1989 ◽  
Vol 58 (11) ◽  
pp. 4093-4097 ◽  
Author(s):  
Kazuya Saito ◽  
Hiroyuki Kamio ◽  
Yoshiaki Honda ◽  
Koichi Kikuchi ◽  
Keiji Kobayashi ◽  
...  
Keyword(s):  
Phase Transition ◽  
Thermoelectric Power ◽  
Order Parameter ◽  
Organic Metal

Unrelated BCS-like pairing pseudogap and critical superconducting transition temperature in various cuprate compounds

2018 ◽  
Vol 32 (18) ◽  
pp. 1850195
Author(s):  
S. Dzhumanov ◽  
E. X. Karimboev ◽  
Sh. S. Djumanov
Keyword(s):  
Transition Temperature ◽  
Superconducting Transition Temperature ◽  
Order Parameter ◽  
Cuprate Superconductors ◽  
Energy Gap ◽  
Characteristic Temperature ◽  
Superconducting Order Parameter ◽  
Superconducting Transition ◽  
Gap Formation ◽  
Arpes Data

The smooth evolution of the energy gap observed in the tunneling and angle-resolved photoemission spectra (ARPES) of high-[Formula: see text] cuprates with lowering the temperature from a pseudogap state above the critical temperature [Formula: see text] to a superconducting state below [Formula: see text], has been poorly interpreted as the evidence that the pseudogap must have the same origin as the superconducting order parameter, and therefore, must be related to [Formula: see text]. We argue that such an explanation of the tunneling gap and ARPES data is misleading. We show that the BCS-like energy gap (or pseudogap) opening in the electronic excitation spectrum of underdoped-to-overdoped cuprates at a characteristic temperature [Formula: see text] and the true superconducting order parameter appearing only at [Formula: see text] are unrelated. The superconducting phenomenon in unconventional cuprate superconductors is fundamentally different from the BCS-like pairing of fermionic quasiparticles, and the superconducting transition temperature [Formula: see text] is not determined by the BCS-like gap formation. The unusual superconducting order parameter in these high-[Formula: see text] materials appears at [Formula: see text] and coexists with the BCS-like gap (or pseudogap) below [Formula: see text].

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