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

High-Frequency Vortex Critical Dynamics of Superconducting Amorphous Mo3Si Films

1997 ◽  
Vol 11 (18) ◽  
pp. 2141-2155 ◽  
Author(s):  
N.-C. Yeh ◽  
U. Kriplani ◽  
W. Jiang ◽  
J. Kumar ◽  
H. F. Fong ◽  
...  
Keyword(s):  
High Temperature ◽  
Vortex Dynamics ◽  
High Frequency ◽  
High Temperature Superconductors ◽  
Three Dimensional ◽  
Critical Dynamics ◽  
Glass Transitions ◽  
Static Disorder ◽  
Type Ii Superconductors ◽  
Si Films

The effects of static disorder on the vortex dynamics of type-II superconductors are investigated by comparing the high-frequency vortex response of superconducting amorphous Mo3Si (a- Mo3Si ) films with that of the high-temperature superconductors. We find that for a- Mo3Si films in the three-dimensional limit, the microwave vortex response near the second-order vortex-solid to vortex-liquid glass transitions is consistent with vortex critical relaxation, in contrast to the diffusion vortex dynamics in high-temperature superconductors at the same frequencies. The observation of microwave vortex critical dynamics in a- Mo3Si is attributed to the extremely disordered nature of the amorphous superconductors, which results in a much shorter-range vortex correlation and therefore a faster critical relaxation.

Cuprate High Temperature Superconductors and the Vision for Room Temperature Superconductivity

SPIN ◽  
2017 ◽  
Vol 07 (02) ◽  
pp. 1750006 ◽  
Author(s):  
Dennis M. Newns ◽  
Glenn J. Martyna ◽  
Chang C. Tsuei
Keyword(s):  
High Temperature ◽  
High Frequency ◽  
Room Temperature ◽  
Phonon Frequency ◽  
High Temperature Superconductors ◽  
Low Frequency ◽  
Unconventional Superconductivity ◽  
Superconducting Transition ◽  
Strongly Coupled ◽  
Room Temperature Superconductivity

Superconducting transition temperatures of 164 K in cuprate high temperature superconductors (HTS) and recently 200 K in H3S under high pressure encourage us to believe that room temperature superconductivity (RTS) might be possible. In considering paths to RTS, we contrast conventional (BCS) SC, such as probably manifested by H3S, with the unconventional superconductivity (SC) in the cuprate HTS family. Turning to SC models, we show that in the presence of one or more van Hove singularities (vHs) near the Fermi level, SC mediated by classical phonons ([Formula: see text]phonon frequency) can occur. The phonon frequency in the standard [Formula: see text] formula is replaced by an electronic cutoff, enabling a much higher [Formula: see text] independent of phonon frequency. The resulting [Formula: see text] and isotope shift plot versus doping strongly resembles that seen experimentally in HTS. A more detailed theory of HTS, which involves mediation by classical phonons, satisfactorily reproduces the chief anomalous features characteristic of these materials. We propose that, while a path to RTS through an H3S-like scenario via strongly-coupled ultra-high frequency phonons is attractive, features perhaps unavailable at ordinary pressures, a route involving SC mediated by classical phonons which can be low frequency may be found.

High frequency characterization of high temperature superconductors

2003 ◽  
Author(s):  
J.T. Williams ◽  
S.A. Long ◽  
J.C. Wolfe ◽  
D.R. Jackson ◽  
D.R. Wilton
Keyword(s):  
High Temperature ◽  
High Frequency ◽  
High Temperature Superconductors
Sign in / Sign up

Export Citation Format

Share Document