Nonmagnetic scattering induced suppression of superfluid density in Bi-2212

2022 ◽  
Author(s):  
Tasaul Sk ◽  
Doyel Rakshit ◽  
Ajay Kumar Ghosh
Keyword(s):  
Critical Temperature ◽  
Superfluid Density ◽  
Superfluid Phase ◽  
Nonmagnetic Impurity ◽  
Strong Suppression ◽  
Phase Fluctuations ◽  
Current Voltage

Abstract Nonlinear current-voltage (IV) characteristics of Bi-2212 observed in the presence of the nonmagnetic impurity have been explained incorporating the idea of Berezinskii-Kosterlitz - Thouless (BKT). An exponent (η) is extracted as a function of temperature (T) for several Bi2-xSr2 CaCu2-x ZnxO8+δ (Bi-2212) superconducting samples. Within the framework of the Ambegaokar-Halperin-Nelson-Siggia (AHNS) theory we have extracted the superfluid phase stiffness (SPS) as a function of T. A scaling between the SPS and critical temperature is observed. Strong suppression by the nonmagnetic impurity has been explained using the idea of localized phase fluctuations in the superconducting planes.

scholarly journals Manipulating the critical temperature for the superfluid phase transition in trapped atomic Fermi gases

2002 ◽  
Vol 65 (6) ◽  
Author(s):  
C. P. Search ◽  
H. Pu ◽  
W. Zhang ◽  
B. P. Anderson ◽  
P. Meystre
Keyword(s):  
Phase Transition ◽  
Critical Temperature ◽  
Fermi Gases ◽  
Superfluid Phase

Importance of phase fluctuations in superconductors with small superfluid density

Nature ◽  
1995 ◽  
Vol 374 (6521) ◽  
pp. 434-437 ◽  
Author(s):  
V. J. Emery ◽  
S. A. Kivelson
Keyword(s):  
Superfluid Density ◽  
Phase Fluctuations

POSSIBLE OBSERVATION OF TUNNELING CURRENTS IN NdBaCuO SUPERCONDUCTING THIN FILMS

2003 ◽  
Vol 17 (04n06) ◽  
pp. 905-909
Author(s):  
A. NIGRO ◽  
P. ROMANO ◽  
B. SAVO
Keyword(s):  
Thin Films ◽  
Critical Temperature ◽  
Tunneling Current ◽  
Superconducting Thin Films ◽  
Quasiparticle Tunneling ◽  
Current Voltage ◽  
Oriented Films ◽  
Normal Resistance ◽  
Current Voltage Characteristics ◽  
Tunneling Behavior

Phenomena resembling a tunneling behavior have been observed on dc sputtered Nd1+xBa2-xu3Oy c-axis oriented films. The current voltage characteristics at 4.2K give evidence of quasiparticle tunneling current as usually measured in superconductor-insulator-normal metal or superconductor-insulator-superconductor junctions, with normal resistance values of about 10Ω. In the conductance curves, peak at about +/-16mV are clearly visible. An analysis of these features is presented up to temperatures close to the sample critical temperature.

ZERO-BIAS ANOMALIES IN THE CURRENT-VOLTAGE AND CONDUCTANCE-VOLTAGE CHARACTERISTICS OF HIGH-CRITICAL-TEMPERATURE SUPERCONDUCTOR JUNCTIONS

1992 ◽  
Vol 06 (02) ◽  
pp. 125-170 ◽  
Author(s):  
THOMAS WALSH
Keyword(s):  
Critical Temperature ◽  
Proximity Effects ◽  
High Critical Temperature ◽  
Normal Surface ◽  
Superconducting Layer ◽  
Zero Bias ◽  
Current Voltage ◽  
Conductive Channel ◽  
In Series ◽  
Magnetic States

The occurrence of zero-bias anomalies (ZBAs) in the current-voltage and conductance-voltage characteristics of high-critical-temperature superconductors (HTS) is reviewed. Following a historical introduction, we summarize studies noting HTS ZBAs. Several explanations of the ZBAs in HTS tunneling characteristics have been proposed including a resistance in series with a Josephson junction, a conductive channel near the Fermi energy ε F , localized magnetic states on film surfaces, proximity effects, a peak in the electron density of states near ε F , an array of junctions in an HTS ceramic sample, coupling between a film's normal surface layer and the superconducting layer below the surface, quasiparticle tunneling, and phase diffusion. The plausibility and implications of these suggested explanations are discussed. Experiments to answer questions that remain regarding the source and significance of the ZBAs are proposed.

Superfluid Density in Ultrathin YBCO Films

2000 ◽  
Vol 659 ◽  
Author(s):  
Lyuba A. Delimova ◽  
Igor V. Grekhov ◽  
Ivan A. Liniichuk ◽  
Ivan A. Veselovsky ◽  
Konstantin B. Traito ◽  
...  
Keyword(s):  
Superfluid Density ◽  
Transport Current ◽  
Weak Links ◽  
Transition Model ◽  
Resistive State ◽  
Resistive Transition ◽  
Current Increase ◽  
Ybco Films ◽  
Current Voltage ◽  
Current Voltage Characteristics

ABSTRACTWe studied the transition of 8 nm-thick YBCO films deposited with and without YBaCuNbO buffer from the superconducting to resistive state due to the temperature or transport current increase. For both film types, the current –voltage characteristics and resistive transition followed the Kosterlitz-Thouless transition model. The superfluid densities were found from the Kosterlitz-Thouless transition temperature TKT to be about 3% and 1.3% of the total carrier density in YBCO with and without buffer, respectively. We believe that the low superfluid densities indicate the presence of weak links in the film.

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