scholarly journals Pair-Breaking and Superconducting State Recovery Dynamics inMgB2

2003 ◽  
Vol 91 (26) ◽  
Author(s):  
J. Demsar ◽  
R. D. Averitt ◽  
A. J. Taylor ◽  
V. V. Kabanov ◽  
W. N. Kang ◽  
...  
Keyword(s):  
Superconducting State ◽  
Pair Breaking ◽  
State Recovery ◽  
Recovery Dynamics

Photoinduced Conductivity Dynamics Studies of MgB2 Thin Films

2003 ◽  
Vol 17 (18n20) ◽  
pp. 3675-3681 ◽  
Author(s):  
Jure Demsar ◽  
Richard D. Averitt ◽  
Antoinette J. Taylor ◽  
Won-Nam Kang ◽  
Heon Jung Kim ◽  
...  
Keyword(s):  
Superconducting State ◽  
Recovery Time ◽  
High Energy ◽  
Strong Temperature Dependence ◽  
Optical Pump ◽  
Time Resolved ◽  
State Recovery ◽  
Order Of Magnitude ◽  
Recovery Dynamics ◽  
Probe Spectroscopy

We present the first direct studies of photoinduced Cooper-pair breaking and subsequent superconducting state recovery dynamics by means of femtosecond time-resolved optical-pump terahertz probe spectroscopy focusing on the superconducting state recovery dynamics in MgB 2. The superconducting state recovery proceeds on the timescale of several hundred picoseconds and shows a strong temperature dependence. In particular, upon increasing the temperature the recovery time first decreases, reaches a minimum, followed by a quasi-divergence upon further increasing the temperature towards Tc. Moreover, the recovery time shows virtually no intensity dependence, even though the photoexcitation fluence is changed by over an order of magnitude. This suggests that pair recovery is goverend by a phonon-bottleneck mechanism, where the lifetime of high energy phonons (ℏω > 2Δ) is governed by their anharmonicity.

Solvent dependence of the ultrafast ground state recovery dynamics of phenol blue

2001 ◽  
Vol 90 (1-3) ◽  
pp. 295-302 ◽  
Author(s):  
Yutaka Nagasawa ◽  
Ayako Watanabe ◽  
Yoshito Ando ◽  
Tadashi Okada
Keyword(s):  
Ground State ◽  
State Recovery ◽  
Solvent Dependence ◽  
Phenol Blue ◽  
Recovery Dynamics

NOVEL TRANSPORT BEHAVIOR FOUND IN THE DISSIPATIVE REGIME OF SUPERCONDUCTORS

1995 ◽  
Vol 09 (07) ◽  
pp. 399-426 ◽  
Author(s):  
MILIND N. KUNCHUR
Keyword(s):  
Kinetic Energy ◽  
Superconducting State ◽  
Interlayer Coupling ◽  
Pair Breaking ◽  
Condensation Energy ◽  
Flux Flow ◽  
Transport Behavior ◽  
Pair Condensation ◽  
Physical Phenomena ◽  
First Time

As the transport current density J in a superconductor is increased beyond its critical value J c , dissipation sets in resulting in a finite resistivity. The superconducting state itself, however, persists up to the pair-breaking value J d , where the kinetic energy associated with the current overcomes the condensation energy. Within this dissipative regime between J c and J d , the transport behavior displays a series of interesting physical phenomena (free flux flow, pair-breaking effect, etc.) as the Lorentz force and kinetic energy associated with the current sequentially overcome various intrinsic (e.g., pair-condensation and interlayer-coupling) and extrinsic (e.g., flux pinning) interactions relevant to the superconducting state. This review discusses these phenomena in the context of recent experiments where the existence of these effects was demonstrated in high-T c superconductors for the first time. Also described are the general principles of the pulsed-current technique used to extend transport measurements to the required high current densities and power-dissipation levels.

Superconducting State under the Influence of External Dynamic Pair Breaking

1972 ◽  
Vol 28 (24) ◽  
pp. 1559-1561 ◽  
Author(s):  
C. S. Owen ◽  
D. J. Scalapino
Keyword(s):  
Superconducting State ◽  
Pair Breaking
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