Hc2anisotropy in the system niobium-nitrogen

✍ Scribed by E. Seidl; H. W. Weber; H. Teichler

• Book ID: 104626010
• Publisher: Springer US
• Year: 1978
• Tongue: English
• Weight: 491 KB
• Volume: 30
• Category: Article
• ISSN: 0022-2291
• DOI: 10.1007/bf00114954

✦ Synopsis

Systematic experiments on the impurity and temperature dependence of the He2 anisotropy in niobium are reported. A combined evaluation of these two dependences within the framework of a recent nonlocal theory is shown to permit a separation of different sources contributing to the I-I~2 anisotropy. Whereas the l = 4 component of the anisotropy is mainly due to bandstructure anisotropies of the normal state, the l = 6 component in pure niobium originates predominantly from anisotropies of the energy gap. The rms anisotropy of the energy gap in niobium is estimated to be 0.08. The anisotropy of the flux line lattice predicted on the basis of the microscopic anisotropy parameters as deduced from the HoE measurements is in agreement with experimental observations. * For a review of the present status of experimental He2 anisotropy investigations see, e.g., Ref. 1.