Thursday, August 25, 2005, 11:00 am — Hamilton Seminar Room, Bldg. 555
We have developed an innovative technique, Hybrid Physical-Chemical Vapor Deposition (HPCVD), to grow epitaxial MgB2 thin films with excellent superconducting and normal-state transport properties. The tensile strain in the films due to crystallite coalescence results in a softening of the E2g phonon and higher-than-bulk Tc values. The long mean free path of the films, which are the cleanest MgB2 materials reported, allow magnetoresistance measurements that reveal rich features of the two-band Fermi surfaces. The HPCVD technique also allows doping of the clean films in a controlled manner, which modifies the interband and intraband scattering and results in record-high upper critical field Hc2 and Hirr values. The demonstrations of HPCVD for high quality polycrystalline coatings on coated conductor fibers, high deposition speed and thick films, and on various polycrystalline substrates makes it a promising technology for high field applications of MgB2.
Hosted by: Lance Cooley
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