کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1817978 1525717 2013 5 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Vortex contribution to the critical temperature oscillations in hybrid superconductor-ferromagnet coaxial cylinders
موضوعات مرتبط
مهندسی و علوم پایه فیزیک و نجوم فیزیک ماده چگال
پیش نمایش صفحه اول مقاله
Vortex contribution to the critical temperature oscillations in hybrid superconductor-ferromagnet coaxial cylinders
چکیده انگلیسی


• We study the switching phenomena in hybrid SC/FM coaxial cylinders.
• The s-wave triplet Usadel equations are considered.
• We investigate the Tc behavior with different vorticities.
• Numerical results exhibit the vortex states in favor of superconductivity in FM.

The s-wave triplet Usadel equations which include the odd frequency triplet condensate are employed to study the oscillatory behavior of the superconducting critical temperature Tc in multiply connected hybrid systems e.g., a ferromagnetic core surrounded by a superconducting shell. This configuration allows us to treat the angular momentum number L of the Cooper pair as the vorticity parameter. The spiral exchange field in the ferromagnet characterized by a spiral wave vector Q, which rotates in the z-plane and its direction varies within an in-plane of the ferromagnetic core. The induced superconductivity in the ferromagnet core is controlled by the electrical contact at the boundary for which we are interested in the switching of the superconducting states among the various vorticity numbers. The peculiar superconducting states with L ≠ 0 bear resemblance to the pi-phase state in the bilayer systems. We demonstrate the switching phenomena by solving the Usadel equations together with the self-consistent order parameter subject to the Kupriyanov-Lukichev boundary conditions at the contact surface to obtain the secular equation in the multimode method to determine the oscillatory behavior of Tc in the ferromagnet core. The Abrikosov–Gorkov like-formula is also obtained within the single mode approximation.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Physica C: Superconductivity - Volume 495, 15 December 2013, Pages 5–9
نویسندگان
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