Physics – Condensed Matter – Superconductivity
Scientific paper
2004-04-29
Physics
Condensed Matter
Superconductivity
5 pages with 4 figures included
Scientific paper
We studied the far-infrared reflectance of superconducting MgB2 in and out of equilibrium using pulsed synchrotron radiation. The equilibrium data can be described by a single energy gap at 2 Delta / hc = 43 cm-1. The fit improves slightly at lower frequencies when two gaps (at 30 cm-1 and 56 cm-1$) are assumed to exist. The non equilibrium data is obtained when excess quasiparticles are generated in the MgB2 film by a laser pulse, decreasing the energy gap(s). The temperature dependence of the number of excess quasiparticles indicates that only a single gap near 30 cm-1 controls the non-equilibrium process. Fits to the photo-induced reflectance show the presence of the two gaps but weakening of an energy gap at 30 cm-1 only. Our data can be understood if one considers the picture where excited quasiparticles created by the laser impulse relax to the lowest gap band before recombining into Cooper pairs.
Carr Larry G.
Choi Eun-Mi
Kang* Won Nam
Kim Hyeong-Jin
Lee Sung-Ik
No associations
LandOfFree
Transient Infrared Photoreflectance Study of Superconducting MgB2: Evidence for Multiple Gaps and Interband Scattering does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Transient Infrared Photoreflectance Study of Superconducting MgB2: Evidence for Multiple Gaps and Interband Scattering, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Transient Infrared Photoreflectance Study of Superconducting MgB2: Evidence for Multiple Gaps and Interband Scattering will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-567457