Temperature-dependent far-infrared reflectance of La-Sr-Cu-O and La-Ca-Cu-O: Bardeen-Cooper-Schrieffer electrodynamics but uncertain energy gap

1988 ◽  
Vol 37 (4) ◽  
pp. 1587-1593 ◽  
Author(s):  
M. S. Sherwin ◽  
P. L. Richards ◽  
A. Zettl
Keyword(s):  
Energy Gap ◽  
Far Infrared ◽  
Infrared Reflectance ◽  
Temperature Dependent

scholarly journals Temperature-dependent far-infrared reflectance of an epitaxial (BaTiO3)8/(SrTiO3)4 superlattice

2017 ◽  
Vol 95 (21) ◽  
Author(s):  
V. Železný ◽  
O. Caha ◽  
A. Soukiassian ◽  
D. G. Schlom ◽  
X. X. Xi
Keyword(s):  
Far Infrared ◽  
Infrared Reflectance ◽  
Temperature Dependent

Anisotropy in the Far Infrared Conductivity of Magnetically-Oriented YBa2Cu3O7-δ Between 50–300K

1989 ◽  
Vol 169 ◽  
Author(s):  
F. Lu ◽  
C.H. Perry ◽  
K. Chen ◽  
R.S. Markiewicz
Keyword(s):  
Energy Gap ◽  
Low Frequency ◽  
Far Infrared ◽  
Free Carrier ◽  
Low Energy ◽  
Phonon Modes ◽  
Temperature Dependent ◽  
Insulating Material ◽  
Gap Anisotropy ◽  
Reflectance Data

AbstractThe far infrared reflectance of magnetically-oriented YBa2Cu3O7-δ has been measured from 30–600 cm-1 over the temperature range 300–50 K. A strongly temperature dependent optical anisotropy is observed in this region. The low energy Ē⊥c spectrum displays a high reflectivity associated with the dominant free carrier contribution. Peaks corresponding to phonons are present in the spectrum associated with the direction perpendicular to the high conductivity Cu - O planes. However the reflectivity for Ē∥c is not characteristic of an insulating material but rather shows a metallic-like rise with decreasing photon energy. The plasma frequencies for both polarizations, obtained from fits to the reflectance data, decrease with decreasing temperature. There is some evidence in the parallel conductivity data taken below Tc, for the onset of an energy gap that is substantially smaller than that deduced for the in-plane value; such a result suggests a large gap anisotropy. The parameters describing a number of low frequency phonon modes for Ē∥c have been determined from fits to the R∥ data. Most show a slight softening as Tc is traversed.

Temperature dependent far-infrared reflectance of layer structured III–VI compounds

1992 ◽  
Vol 13 (3) ◽  
pp. 253-259 ◽  
Author(s):  
C. Julien ◽  
M. Eddrief ◽  
M. Balkanski ◽  
A. Chevy
Keyword(s):  
Far Infrared ◽  
Infrared Reflectance ◽  
Temperature Dependent

Apparent Structure on the Far Infrared Energy Gap in Superconducting Lead and Mercury

1959 ◽  
Vol 3 (7) ◽  
pp. 337-338 ◽  
Author(s):  
D. M. Ginsberg ◽  
P. L. Richards ◽  
M. Tinkham
Keyword(s):  
Energy Gap ◽  
Far Infrared

scholarly journals Momentum-resolved superconducting energy gaps of Sr2RuO4 from quasiparticle interference imaging

2020 ◽  
Vol 117 (10) ◽  
pp. 5222-5227 ◽  
Author(s):  
Rahul Sharma ◽  
Stephen D. Edkins ◽  
Zhenyu Wang ◽  
Andrey Kostin ◽  
Chanchal Sow ◽  
...  
Keyword(s):  
Knight Shift ◽  
Energy Gap ◽  
Space Structure ◽  
Superconducting Order Parameter ◽  
Temperature Dependent ◽  
High Precision Measurement ◽  
Quasiparticle Interference ◽  
Energy Gaps ◽  
Superconducting Energy Gap ◽  
Intense Research

Sr2RuO4 has long been the focus of intense research interest because of conjectures that it is a correlated topological superconductor. It is the momentum space (k-space) structure of the superconducting energy gap Δi(k) on each band i that encodes its unknown superconducting order parameter. However, because the energy scales are so low, it has never been possible to directly measure the Δi(k) of Sr2RuO4. Here, we implement Bogoliubov quasiparticle interference (BQPI) imaging, a technique capable of high-precision measurement of multiband Δi(k). At T = 90 mK, we visualize a set of Bogoliubov scattering interference wavevectors qj:j=1−5 consistent with eight gap nodes/minima that are all closely aligned to the (±1,±1) crystal lattice directions on both the α and β bands. Taking these observations in combination with other very recent advances in directional thermal conductivity [E. Hassinger et al., Phys. Rev. X 7, 011032 (2017)], temperature-dependent Knight shift [A. Pustogow et al., Nature 574, 72–75 (2019)], time-reversal symmetry conservation [S. Kashiwaya et al., Phys. Rev B, 100, 094530 (2019)], and theory [A. T. Rømer et al., Phys. Rev. Lett. 123, 247001 (2019); H. S. Roising, T. Scaffidi, F. Flicker, G. F. Lange, S. H. Simon, Phys. Rev. Res. 1, 033108 (2019); and O. Gingras, R. Nourafkan, A. S. Tremblay, M. Côté, Phys. Rev. Lett. 123, 217005 (2019)], the BQPI signature of Sr2RuO4 appears most consistent with Δi(k) having dx2−y2(B1g) symmetry.

BCS temperature-dependent superconducting energy gap in domain boundaries of melt-textured YBa2Cu3O7

1994 ◽  
Vol 7 (2) ◽  
pp. 409-414
Author(s):  
Moises Levy ◽  
Zheng -Xiao Li ◽  
Bimal K. Sarma ◽  
S. Salem-Sugui ◽  
Donglu Shi
Keyword(s):  
Energy Gap ◽  
Temperature Dependent ◽  
Superconducting Energy Gap ◽  
Domain Boundaries
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