Abstract
From the nonlocal GLAG theory expressions are derived for chi/sub 1/ and chi/sub 2/ of a clean, cubic crystal with a general Fermi surface. In the region of weak nonlocality near T/sub c/ the correction terms in H/sub c/2, chi/sub 1/, and chi/sub 2/ due to the nonspherical Fermi surface are expressed by two dimensionless Fermi surface averages. For highly purified Nb single crystals and polycrystalline Nb samples, chi/sub 1/ and chi/sub 2/ were determined from magnetization measurements in the temperature range (0.3--0.95) T/sub c/. The experimental data show that the orientation dependence in chi/sub 2/ is twice as large as in chi/sub 1/, in agreement with the theoretical result near T/sub c/. The two Fermi surface averages that characterize the anisotropy of H/sub c/2, chi/sub 1/, and chi/sub 2/ near T/sub c/ are estimated from experimental data for Nb and V.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
