scholarly journals TDependence of the Magnetic Penetration Depth in Unconventional Superconductors at Low Temperatures: Can It Be Linear?

1998 ◽  
Vol 80 (21) ◽  
pp. 4761-4762 ◽  
Author(s):  
N. Schopohl ◽  
O. V. Dolgov
Keyword(s):  
Penetration Depth ◽  
Low Temperatures ◽  
Magnetic Penetration Depth ◽  
Unconventional Superconductors ◽  
Magnetic Penetration

Magnetic Penetration Depth Measurements and Inhomogeneity in YBa2Cu3O7−δ Superconducting Thin Films

1990 ◽  
Vol 195 ◽  
Author(s):  
Steven M. Anlage ◽  
Brian W. Langley ◽  
Jurgen Halbritter ◽  
Chang-Beom Eom ◽  
Neil Switz ◽  
...  
Keyword(s):  
Thin Films ◽  
Temperature Dependence ◽  
Penetration Depth ◽  
Exponential Decay ◽  
Power Law ◽  
Low Temperatures ◽  
Bcs Theory ◽  
Magnetic Penetration Depth ◽  
Microstrip Resonator ◽  
Magnetic Penetration

ABSTRACTThe microstrip resonator technique has been applied to study the temperature dependence of the magnetic penetration depth in high quality YBa2Cu3O7−δ thin films. The temperature dependence at low temperatures comes out directly from measured data, with no assumptions about transmission line geometry, dielectric properties, or a model for the temperature dependence of the penetration depth. One can interpret the data in terms of either an exponential decay of λ(T) at low temperatures or as a power law decay. The energy gaps obtained from the exponential decay at low temperature are found to be significantly smaller than weak coupled BCS theory and power-law exponents are in the range of 1.3 to 3.2. These results will be discussed in terms of microscopic theories and the possibility that materials properties dominate the measurement.

LOW TEMPERATURE DEPENDENCE OF THE PENETRATION DEPTH IN SUPERCONDUCTOR MgB2 IN THE PRESENCE AND ABSENCE OF IMPURITIES

2004 ◽  
Vol 18 (03) ◽  
pp. 369-377 ◽  
Author(s):  
M. A. SHAHZAMANIAN ◽  
H. YAVARY
Keyword(s):  
Temperature Dependence ◽  
Penetration Depth ◽  
Low Temperatures ◽  
Weighted Sum ◽  
Gap Model ◽  
Magnetic Penetration Depth ◽  
S Wave ◽  
Effect Of Impurities ◽  
Gap Models ◽  
Magnetic Penetration

The large variety of the measured magnetic penetration depth is interpreted by using two microscopic gap models. We calculate the penetration depth of superconductor MgB 2 in low temperatures by using two gap and an anisotropic s-wave gap models. In the two gap model we consider that the total penetration depth is a weighted sum of the contribution from σ- and π-bands and the interaction between these two bands is ignored. The effect of impurities on the σ-band is less than that π-band and there are tremendous modifications of the temperature dependence of the penetration depth for π-band.

Magnetic penetration depth measurements with the microstrip resonator technique

1990 ◽  
Vol 3 (3) ◽  
pp. 311-316 ◽  
Author(s):  
S. M. Anlage ◽  
B. W. Langley ◽  
H. J. Snortland ◽  
C. B. Eom ◽  
T. H. Geballe ◽  
...  
Keyword(s):  
Penetration Depth ◽  
Magnetic Penetration Depth ◽  
Microstrip Resonator ◽  
Magnetic Penetration
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