Millimeter-Microwave Studies of Energy-Gap Anisotropy in Superconductors

1964 ◽  
Vol 136 (6A) ◽  
pp. A1471-A1480 ◽  
Author(s):  
Manfred A. Biondi ◽  
M. P. Garfunkel ◽  
Wm. A. Thompson
Keyword(s):  
Energy Gap ◽  
Gap Anisotropy

scholarly journals Energy gap evolution across the superconductivity dome in single crystals of (Ba1−xKx)Fe2As2

2016 ◽  
Vol 2 (9) ◽  
pp. e1600807 ◽  
Author(s):  
Kyuil Cho ◽  
Marcin Kończykowski ◽  
Serafim Teknowijoyo ◽  
Makariy A. Tanatar ◽  
Yong Liu ◽  
...  
Keyword(s):  
Single Crystals ◽  
Abrupt Change ◽  
Energy Gap ◽  
Superconducting Transition ◽  
London Penetration Depth ◽  
Wave State ◽  
Iron Based Superconductors ◽  
Optimal Doping ◽  
Gap Anisotropy ◽  
Materials Research

The mechanism of unconventional superconductivity in iron-based superconductors (IBSs) is one of the most intriguing questions in current materials research. Among non-oxide IBSs, (Ba1−xKx)Fe2As2has been intensively studied because of its high superconducting transition temperature and fascinating evolution of the superconducting gap structure from being fully isotropic at optimal doping (x≈ 0.4) to becoming nodal atx> 0.8. Although this marked evolution was identified in several independent experiments, there are no details of the gap evolution to date because of the lack of high-quality single crystals covering the entire K-doping range of the superconducting dome. We conducted a systematic study of the London penetration depth, λ(T), across the full phase diagram for different concentrations of point-like defects introduced by 2.5-MeV electron irradiation. Fitting the low-temperature variation with the power law, Δλ ~Tn, we find that the exponentnis the highest and theTcsuppression rate with disorder is the smallest at optimal doping, and they evolve with doping being away from optimal, which is consistent with increasing gap anisotropy, including an abrupt change aroundx≃ 0.8, indicating the onset of nodal behavior. Our analysis using a self-consistentt-matrix approach suggests the ubiquitous and robust nature ofs±pairing in IBSs and argues against a previously suggested transition to ad-wave state nearx= 1 in this system.

Energy gap anisotropy in bulk Pb via tunneling

Physica ◽  
1971 ◽  
Vol 55 ◽  
pp. 475-483 ◽  
Author(s):  
B.L. Blackford
Keyword(s):  
Energy Gap ◽  
Gap Anisotropy

Energy gap anisotropy in superconducting indium

1968 ◽  
Vol 27 (9) ◽  
pp. 608-609 ◽  
Author(s):  
T.D. Clark
Keyword(s):  
Energy Gap ◽  
Gap Anisotropy

Critical Magnetic Field and Energy-Gap Anisotropy of Zinc

1973 ◽  
Vol 7 (9) ◽  
pp. 4118-4123 ◽  
Author(s):  
D. U. Gubser ◽  
J. E. Cox
Keyword(s):  
Magnetic Field ◽  
Energy Gap ◽  
Critical Magnetic Field ◽  
Gap Anisotropy

Effect of the Superconducting Energy-Gap Anisotropy on the Thermal Conductivity of Tin

1967 ◽  
Vol 163 (2) ◽  
pp. 364-372 ◽  
Author(s):  
J. E. Gueths ◽  
N. N. Clark ◽  
D. Markowitz ◽  
F. V. Burckbuchler ◽  
C. A. Reynolds
Keyword(s):  
Thermal Conductivity ◽  
Energy Gap ◽  
Superconducting Energy Gap ◽  
Gap Anisotropy
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