scholarly journals Measuring the superconducting coherence length in thin films using a two-coil experiment

2013 ◽  
Vol 88 (13) ◽  
Author(s):  
John Draskovic ◽  
Thomas R. Lemberger ◽  
Brian Peters ◽  
Fengyuan Yang ◽  
Jaseung Ku ◽  
...  
Keyword(s):  
Thin Films ◽  
Coherence Length ◽  
Superconducting Coherence Length

scholarly journals Superconducting coherence length of hole-doped cuprates obtained from electron–boson spectral density function

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Jungseek Hwang
Keyword(s):  
Spectral Density ◽  
Coherence Length ◽  
Cooper Pair ◽  
Average Frequency ◽  
Spin Fluctuations ◽  
Fermi Velocity ◽  
Cooper Pairs ◽  
Spectroscopic Techniques ◽  
Microscopic Mechanism ◽  
Superconducting Coherence Length

AbstractElectron–boson spectral density functions (EBSDFs) can be obtained from measured spectra using various spectroscopic techniques, including optical spectroscopy. EBSDFs, known as glue functions, are suggested to have a magnetic origin. Here, we investigated EBSDFs obtained from the measured optical spectra of hole-doped cuprates with wide doping levels, from underdoped to overdoped cuprates. The average frequency of an EBSDF provides the timescale for the spin fluctuations to form Cooper pairs. This timescale is directly associated with retarded interactions between electrons. Using this timescale and Fermi velocity, a reasonable superconducting coherence length, which reflects the size of the Cooper pair, can be extracted. The obtained coherence lengths were consistent with those measured via other experimental techniques. Therefore, the formation of Cooper pairs in cuprates can be explained by spin fluctuations, the timescales of which appear in EBSDFs. Consequently, EBSDFs provide crucial information on the timescale of the microscopic mechanism of Cooper pair formation.

Impurity effects on the superconducting coherence length in Zn- or Ni-dopedYBa2Cu3O6.9single crystals

1999 ◽  
Vol 60 (1) ◽  
pp. 114-117 ◽  
Author(s):  
K. Tomimoto ◽  
I. Terasaki ◽  
A. I. Rykov ◽  
T. Mimura ◽  
S. Tajima
Keyword(s):  
Coherence Length ◽  
Impurity Effects ◽  
Superconducting Coherence Length

Fabrication and Electric Transport in MgB2 Doped with Nanosized Carbon-Based Core-Shell Structures

2010 ◽  
Vol 663-665 ◽  
pp. 871-875
Author(s):  
Viorel Sandu ◽  
Gheorghe Virgil Aldica ◽  
Stelian Popa ◽  
Elena Cimpoiasu ◽  
Florian Dumitrache ◽  
...  
Keyword(s):  
Coherence Length ◽  
Shell Structures ◽  
Electric Transport ◽  
Metallic Core ◽  
The Core ◽  
Ceramic Samples ◽  
Plasma Sintering ◽  
Short Processing Time ◽  
Spark Plasma ◽  
Superconducting Coherence Length

We present the fabrication and electric properties of MgB2 ceramic samples doped with nanosized spheres, 4-8 nm, of graphite with a metallic core. The samples were prepared using the spark plasma sintering technique. The size of the additive is comparable to the superconducting coherence length. The short processing time limits the diffusion of the carbon while keeping the core intact. Therefore, in addition to the doping with carbon, the metallic core, which has the size smaller than the superconducting coherence length, create pinning centers which might improve the dissipationless electric transport. The results are analyzed in the framework of different pinning models.

scholarly journals Hole doping dependence of the coherence length in La 2 − x Sr x CuO 4 thin films

2003 ◽  
Vol 64 (6) ◽  
pp. 790-796 ◽  
Author(s):  
H. H Wen ◽  
H. P Yang ◽  
S. L Li ◽  
X. H Zeng ◽  
A. A Soukiassian ◽  
...  
Keyword(s):  
Thin Films ◽  
Coherence Length ◽  
Hole Doping ◽  
Doping Dependence

scholarly journals Superconducting Coherence Length of Hole-doped Cuprates Obtained From Electron-boson Spectral Density Function

2021 ◽  
Author(s):  
Jungseek Hwang
Keyword(s):  
Spectral Density ◽  
Coherence Length ◽  
Cooper Pair ◽  
Average Frequency ◽  
Spin Fluctuations ◽  
Fermi Velocity ◽  
Cooper Pairs ◽  
Spectroscopic Techniques ◽  
Microscopic Mechanism ◽  
Superconducting Coherence Length

Abstract Electron{boson spectral density functions (EBSDFs) can be obtained from measured spectra using various spectroscopic techniques, including optical spectroscopy. EBSDFs, known as glue functions, have a magnetic origin. Here, we investigated EBSDFs obtained from the measured optical spectra of hole-doped cuprates with wide doping levels, from underdoped to overdoped cuprates. The average frequency of an EBSDF provides the timescale for the spin fluctuations to form Cooper pairs. This timescale is directly associated with retarded interactions betweenelectrons. Using this timescale and Fermi velocity, a reasonable superconducting coherence length, which reflects the size of the Cooper pair, can be extracted. The obtained coherence lengths were consistent with those measured via other experimental techniques. Therefore, the formation of Cooper pairs in cuprates can be explained by spin fluctuations, the timescales of which appear in EBSDFs. Consequently, EBSDFs provide crucial information on the timescale of the microscopic mechanism of Cooper pair formation.

SCALING BETWEEN LOCALIZATION LENGTH AND TC IN DISORDERED YBa2Cu3O6.9

1999 ◽  
Vol 13 (29n31) ◽  
pp. 3601-3604
Author(s):  
ANDREA GAUZZI ◽  
DAVOR PAVUNA
Keyword(s):  
Coherence Length ◽  
Localization Length ◽  
Charge Carriers ◽  
Superconducting Transition ◽  
Scaling Relation ◽  
X Ray Diffraction ◽  
Ginzburg Landau ◽  
X Ray ◽  
Structural Coherence ◽  
Superconducting Coherence Length

We quantitatively study the effect of growth-induced reduction of long range structural order on the superconducting transition in epitaxial YBa 2 Cu 3 O 6.9 films. The corresponding reduction of structural coherence length rc is determined from the width of X-ray diffraction rocking curves. Tc measurements in the films give evidence for the validity of the empirical scaling relation ΔTc~ rc,ab-2, where ΔTc is the disorder-induced reduction of Tc and rc,ab is the structural coherence length in the ab-plane. To explain this algebraic law we propose a simple phenomenological model based on the disorder-induced localization of the charge carriers within each ordered domain of size rc,ab. This picture enables us to precisely determine the Ginzburg-Landau superconducting coherence length in the ab-plane, and we obtain ξab=1.41±0.04 nm.

Crystalline coherence length effects on the thermal conductivity of MgO thin films

2016 ◽  
Vol 51 (23) ◽  
pp. 10408-10417 ◽  
Author(s):  
Kelsey E. Meyer ◽  
Ramez Cheaito ◽  
Elizabeth Paisley ◽  
Christopher T. Shelton ◽  
Jeffrey L. Braun ◽  
...  
Keyword(s):  
Thin Films ◽  
Thermal Conductivity ◽  
Coherence Length ◽  
Length Effects

scholarly journals Observation of long phase-coherence length in epitaxial La-doped CdO thin films

2017 ◽  
Vol 96 (24) ◽  
Author(s):  
Yu Yun ◽  
Yang Ma ◽  
Songsheng Tao ◽  
Wenyu Xing ◽  
Yangyang Chen ◽  
...  
Keyword(s):  
Thin Films ◽  
Coherence Length ◽  
Phase Coherence ◽  
Cdo Thin Films ◽  
La Doped
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