The central bond 13C=13C isotope effect for superconductivity in high-Tc .beta.*-(ET)2I3 and its implications regarding the superconducting pairing mechanism

1992 ◽  
Vol 114 (25) ◽  
pp. 10069-10071 ◽  
Author(s):  
K. Douglas Carlson ◽  
Jack M. Williams ◽  
Urs Geiser ◽  
Aravinda M. Kini ◽  
H. Hau Wang ◽  
...  
Keyword(s):  
Isotope Effect ◽  
Pairing Mechanism ◽  
High Tc ◽  
13C Isotope ◽  
Central Bond ◽  
Superconducting Pairing

Carbon-13-carbon-13 double bond isotope effect for Tc and consequences regarding the superconducting pairing mechanism in .kappa.-(ET)2X superconductors

1992 ◽  
Vol 31 (16) ◽  
pp. 3346-3348 ◽  
Author(s):  
K. Douglas Carlson ◽  
Aravinda M. Kini ◽  
Richard A. Klemm ◽  
H. Hau Wang ◽  
Jack M. Williams ◽  
...  
Keyword(s):  
Double Bond ◽  
Isotope Effect ◽  
Pairing Mechanism ◽  
Superconducting Pairing

Search for the Barium Isotope Effect in the High-Tc Superconductor YBa2Cu3O7-x

1988 ◽  
pp. 217-220
Author(s):  
A. Inyushkin ◽  
N. Babushkina ◽  
V. Florentiev ◽  
A. Kopylov ◽  
V. Ozhogin ◽  
...  
Keyword(s):  
Isotope Effect ◽  
High Tc ◽  
High Tc Superconductor ◽  
Barium Isotope

Evidence for Phonon-Mediated Coupling in Superconducting Ba0.6K0.4BiO3

1989 ◽  
Vol 156 ◽  
Author(s):  
D. G. Hinks ◽  
B. Dabrowski ◽  
D. R. Richards ◽  
J. D. Jorgensen ◽  
Shiyou Pei ◽  
...  
Keyword(s):  
Transition Temperature ◽  
Strong Coupling ◽  
Isotope Effect ◽  
Tunneling Spectroscopy ◽  
Superconducting Gap ◽  
Optical Phonons ◽  
Pairing Mechanism ◽  
Strongly Coupled ◽  
A Value ◽  
O Isotope

ABSTRACTSuperconducting Ba0.6K0.4BiO3, with a Tc of 30K, shows a large 18O isotope effect which indicates that phonons are involved in the pairing mechanism. Infrared reflectivity measurements indicate a value for the superconducting gap consistent with moderate coupling (2Δ/kTc = 3.5 ± 0.5). A mediating energy for pairing of about 40 meV would be required to obtain a Tc of 30K. Strong coupling of electrons by optical phonons (which are present in this material with energies up to 80 meV) could account for the observed transition temperature. Recent tunneling spectroscopy shows the presence of strongly coupled optical phonons in the 40 to 70 meV region, indicating that superconductivity in this material may be phonon mediated.

THEORY OF THE ISOTOPE EFFECT AND SUPERCONDUCTING TRANSITION TEMPERATURE IN HIGH-Tc OXIDES

2011 ◽  
Vol 25 (26) ◽  
pp. 2069-2078 ◽  
Author(s):  
A. BECHLAGHEM ◽  
D. BOURBIE
Keyword(s):  
Experimental Data ◽  
Transition Temperature ◽  
Fermi Level ◽  
Isotope Effect ◽  
Qualitative Agreement ◽  
Superconducting Transition Temperature ◽  
Superconducting Transition ◽  
Van Hove Singularity ◽  
High Tc ◽  
Analytical Expressions

Analytical expressions for the superconducting transition temperature Tc and the isotope coefficient α have been obtained for the case where the Fermi level is close to the van Hove singularity. In this approach, we consider two interactions, the first related to the phonons and the second relevant to the magnetic excitations. Our result shows that the isotope coefficient α decreases with the superconducting transition temperature Tc in qualitative agreement with experimental data.

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