scholarly journals Calculations of Some Doping Nanostructurations and Patterns Improving the Functionality of High-Temperature Superconductors for Bolometer Device Applications

Nanomaterials ◽  
2020 ◽  
Vol 10 (1) ◽  
pp. 97
Author(s):  
Jose C. Verde ◽  
Alberto S. Viz ◽  
Martín M. Botana ◽  
Carlos Montero-Orille ◽  
Manuel V. Ramallo
Keyword(s):  
High Temperature ◽  
Critical Temperature ◽  
High Temperature Superconductors ◽  
Operational Parameters ◽  
Transition Edge ◽  
Saturation Power ◽  
Order Of Magnitude ◽  
Device Applications ◽  
Materials Used ◽  
Carrier Doping

We calculate the effects of doping nanostructuration and the patterning of thin films of high-temperature superconductors (HTS) with the aim of optimizing their functionality as sensing materials for resistive transition-edge bolometer devices (TES). We focus, in particular, on spatial variations of the carrier doping into the CuO 2 layers due to oxygen off-stoichiometry, (that induce, in turn, critical temperature variations) and explore following two major cases of such structurations: First, the random nanoscale disorder intrinsically associated to doping levels that do not maximize the superconducting critical temperature; our studies suggest that this first simple structuration already improves some of the bolometric operational parameters with respect to the conventional, nonstructured HTS materials used until now. Secondly, we consider the imposition of regular arrangements of zones with different nominal doping levels (patterning); we find that such regular patterns may improve the bolometer performance even further. We find one design that improves, with respect to nonstructured HTS materials, both the saturation power and the operating temperature width by more than one order of magnitude. It also almost doubles the response of the sensor to radiation.

scholarly journals Torque magnetometry on single-crystal high-temperature superconductors near the critical temperature: A scaling approach

2000 ◽  
Vol 62 (1) ◽  
pp. 631-639 ◽  
Author(s):  
J. Hofer ◽  
T. Schneider ◽  
J. M. Singer ◽  
M. Willemin ◽  
H. Keller ◽  
...  
Keyword(s):  
High Temperature ◽  
Critical Temperature ◽  
Single Crystal ◽  
High Temperature Superconductors ◽  
Torque Magnetometry

scholarly journals Superconducting Hydrides Under Pressure

2020 ◽  
Vol 11 (1) ◽  
pp. 57-76 ◽  
Author(s):  
Chris J. Pickard ◽  
Ion Errea ◽  
Mikhail I. Eremets
Keyword(s):  
Hydrogen Sulfide ◽  
High Temperature ◽  
Critical Temperature ◽  
First Principles ◽  
High Temperature Superconductors ◽  
Microscopic Structure

The measurement of superconductivity at above 200 K in compressed samples of hydrogen sulfide and in lanthanum hydride at 250 K is reinvigorating the search for conventional high temperature superconductors. At the same time, it exposes a fascinating interplay between theory, computation, and experiment. Conventional superconductivity is well understood, and theoretical tools are available for accurate predictions of the superconducting critical temperature. These predictions depend on knowing the microscopic structure of the material under consideration, which can now be provided by computational first-principles structure predictions. The experiments at the megabar pressures required are extremely challenging, but, for some groups at least, permit the experimental exploration of materials space. We discuss the prospects for the search for new superconductors, ideally at lower pressures.

scholarly journals THE 3d-TO-4s-BY-2p HIGHWAY TO SUPERCONDUCTIVITY IN CUPRATES

2002 ◽  
Vol 16 (30) ◽  
pp. 4577-4585 ◽  
Author(s):  
TODOR M. MISHONOV ◽  
JOSEPH O. INDEKEU ◽  
EVGENI S. PENEV
Keyword(s):  
High Temperature ◽  
Critical Temperature ◽  
High Temperature Superconductors ◽  
Electron Exchange ◽  
Theoretical Physics ◽  
Pairing Interaction ◽  
Electron Pairing

High-temperature superconductors are nowadays found in great variety and hold technological promise. It is still an unsolved mystery that the critical temperature T c of the basic cuprates is so high. The answer might well be hidden in a conventional corner of theoretical physics, overlooked in the recent hunt for exotic explanations of new effects in these materials. A forgotten intra-atomic s–d two-electron exchange in the Cu atom is found to provide a strong (~ eV) electron pairing interaction. A Bardeen–Cooper–Schrieffer approach can explain the main experimental observations and predict the correct dx2-y2 symmetry of the gap.

Fluorine Substitution in High Temperature Superconductors

1999 ◽  
Vol 13 (09n10) ◽  
pp. 973-978 ◽  
Author(s):  
E. Bellingeri ◽  
G. Grasso ◽  
R. Gladyshevskii ◽  
E. Giannini ◽  
F. Marti ◽  
...  
Keyword(s):  
Crystal Structure ◽  
High Temperature ◽  
Critical Temperature ◽  
Low Temperature ◽  
High Temperature Superconductors ◽  
Irreversibility Field ◽  
Fluorine Substitution ◽  
Superconducting Phases

Fluorine substitution in the Bi(2223), Bi(2212) and Tl(1223) superconducting phases was studied. We obtained superconducting structures, never observed before, of the Bi-based superconductors by a low temperature (200-400 °C) fluorination process. Fluorine substitutes completely the oxygen sites in the Bi layers and additional F atoms are inserted in the structure. As a consequence, changes in the arrangements of cation and anions were induced, especially in the Bi and partially in the Sr layer. F-doped Tl(1223) has been prepared in the same way as Bi(2223) and Bi(2212) (low temperature fluorination), but also starting from precursor containing fluorides of different elements. No significant differences in the crystal structure have been observed between the Tl-based samples with F inclusions and without. The critical temperature (116 K) remains unchanged but a significant increase of the irreversibility field at low temperature was found.

Microwave device applications and high-frequency electrodynamics of high-temperature superconductors

1996 ◽  
Author(s):  
Dong H. Wu ◽  
Mark Santer ◽  
James C. Booth ◽  
Julia Phillips ◽  
Steven M. Anlage
Keyword(s):  
High Temperature ◽  
High Frequency ◽  
High Temperature Superconductors ◽  
Microwave Device ◽  
Device Applications

scholarly journals A Schematic Two Overlapping-Band Model for Superconducting Sulfur Hydrides: The Isotope Mass Exponent

2019 ◽  
Vol 2019 ◽  
pp. 1-7 ◽  
Author(s):  
R. M. Méndez-Moreno
Keyword(s):  
High Temperature ◽  
Critical Temperature ◽  
Fermi Surface ◽  
Coupling Parameter ◽  
High Temperature Superconductors ◽  
Band Model ◽  
Intermediate Coupling ◽  
Electronic Density ◽  
Knowing That ◽  
Multicomponent Model

The high value of the isotope shift in sulfur hydrides supports a phonon-mediated pairing scenario of superconductivity for these high-temperature superconductors which are consistent with the Bardeen–Cooper–Schrieffer (BCS) framework. Knowing that a large electronic density of states enhances the critical temperature (Tc), generalized Fermi surface topologies are used to increase it. A multicomponent model within the BCS framework is proposed in this work for sulfur hydride superconductors. This model is used to evaluate some properties of the H3S superconductor. Strong and intermediate coupling effects are taken into account with the effective McMillan approximation, and the isotope coefficient is evaluated as a function of the coupling parameter as well as other relevant parameters of the model.

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