Two-gap superconductivity in the Fe-1111 superconductor LaFeAsO1−x Fx: A point-contact Andreev-reflection study

Open Physics ◽  
2009 ◽  
Vol 7 (2) ◽  
Author(s):  
Renato Gonnelli ◽  
Mauro Tortello ◽  
Dario Daghero ◽  
Giovanni Ummarino ◽  
Valeri Stepanov ◽  
...  
Keyword(s):  
Low Temperature ◽  
Theoretical Analysis ◽  
Temperature Dependence ◽  
Andreev Reflection ◽  
Point Contact ◽  
Layered Superconductor ◽  
Reflection Spectra ◽  
Eliashberg Theory ◽  
Boson Coupling ◽  
The Rich

AbstractPoint-contact Andreev-reflection (PCAR) experiments were performed in the Fe-1111 layered superconductor LaFeAsO0.9F0.1 with resistive T con ∼ 27 K. The observation of two pairs of peaks in the low-temperature Andreev-reflection spectra clearly indicates the presence of two order parameters. The behavior of the two gaps as a function of temperature, obtained by fitting the conductance curves by means of the generalized two-band Blonder-Tinkham-Klapwijk model, shows some anomalies. A theoretical analysis performed within the two-band Eliashberg theory with a generic electron-boson coupling can reproduce the low-temperature value of the two gaps but generally fails in giving a satisfactory fit of their overall temperature dependence, indicating the rich and complex physics of these newly discovered superconductors.

scholarly journals Andreev bound states in superconductor/ferromagnet point contact Andreev reflection spectra

2017 ◽  
Vol 95 (9) ◽  
Author(s):  
K. A. Yates ◽  
L. A. B. Olde Olthof ◽  
M. E. Vickers ◽  
D. Prabhakaran ◽  
M. Egilmez ◽  
...  
Keyword(s):  
Bound States ◽  
Andreev Reflection ◽  
Point Contact ◽  
Reflection Spectra ◽  
Andreev Bound States

scholarly journals Temperature dependence of transport spin polarization inNdNi5from point-contact Andreev reflection

2007 ◽  
Vol 75 (1) ◽  
Author(s):  
Sourin Mukhopadhyay ◽  
Pratap Raychaudhuri ◽  
Devang A. Joshi ◽  
C. V. Tomy
Keyword(s):  
Temperature Dependence ◽  
Spin Polarization ◽  
Andreev Reflection ◽  
Point Contact

THERMAL CONDUCTIVITY OF LAYERED SUPERCONDUCTORS

1993 ◽  
Vol 07 (01n03) ◽  
pp. 95-98
Author(s):  
C. JIANG ◽  
J. P. CARBOTTE
Keyword(s):  
Thermal Conductivity ◽  
Low Temperature ◽  
Temperature Dependence ◽  
Layered Structure ◽  
Superconducting State ◽  
Full Account ◽  
Layered Superconductors ◽  
Eliashberg Theory ◽  
Electronic Thermal Conductivity

We present results for the electronic thermal conductivity in the superconducting state for a layered structure. The electrons are assumed to be free in the xy plane with a hopping probability from plane to plane. Eliashberg theory adapted to this geometry. with full account of the corresponding anisotropy, is used to evaluate the thermal conductivity. It is found that anisotropy can profoundly affect its temperature dependence particularly at low temperature.

scholarly journals Effect of Transport-Induced Charge Inhomogeneity on Point-Contact Andreev Reflection Spectra at Ferromagnet–Superconductor Interfaces

2012 ◽  
Vol 81 (8) ◽  
pp. 084704 ◽  
Author(s):  
Ya-Fen Hsu ◽  
Tien-Wei Chiang ◽  
Guang-Yu Guo ◽  
Shang-Fan Lee ◽  
Jun-Jih Liang
Keyword(s):  
Andreev Reflection ◽  
Point Contact ◽  
Reflection Spectra ◽  
Induced Charge

scholarly journals Analysis of point-contact Andreev reflection spectra in spin polarization measurements

2004 ◽  
Vol 70 (5) ◽  
Author(s):  
G. T. Woods ◽  
R. J. Soulen ◽  
I. Mazin ◽  
B. Nadgorny ◽  
M. S. Osofsky ◽  
...  
Keyword(s):  
Spin Polarization ◽  
Andreev Reflection ◽  
Point Contact ◽  
Reflection Spectra ◽  
Polarization Measurements

Conductance features in point contact Andreev reflection spectra

2009 ◽  
Vol 21 (9) ◽  
pp. 095701 ◽  
Author(s):  
V Baltz ◽  
A D Naylor ◽  
K M Seemann ◽  
W Elder ◽  
S Sheen ◽  
...  
Keyword(s):  
Andreev Reflection ◽  
Point Contact ◽  
Reflection Spectra
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