Commensurate vortex lattices and oscillation effects in superconducting Mo/Si and W/Si multilayers

• Veröffentlicht in: Физика низких температур
• Datum: 2005
• ISSN: 0132-6414
• Hauptverfasser: Mikhailov, M.Yu., Yuzephovich, O.I., Bomze, Yu.V., Buchstab, E.I., Fogel, N.Ya.
• Format: Artikel
• Sprache: Englisch
• Veröffentlicht: Фізико-технічний інститут низьких температур ім. Б.І. Вєркіна НАН України 2005
• Schlagworte: Свеpхпpоводимость, в том числе высокотемпеpатуpная
• Online Zugang: https://nasplib.isofts.kiev.ua/handle/123456789/121752
• Назва журналу: Digital Library of Periodicals of National Academy of Sciences of Ukraine
• Zitieren: Commensurate vortex lattices and oscillation effects in
 superconducting Mo/Si and W/Si multilayers / M.Yu. Mikhailov, O.I. Yuzephovich, Yu.V. Bomze, E.I. Buchstab, N.Ya. Fogel // Физика низких температур. — 2005. — Т. 31, № 3-4. — С. 327-338. — Бібліогр.: 47 назв. — англ.

We report experimental results of the vortex lattice structure investigation in the artificial
 superconducting Mo/Si and W/Si superlattices. The resistance R and critical current Ic measurements
 in parallel magnetic fields have been performed as well as measurements in tilted magnetic
 fields. At temperatures where condition of strong layering is satisfied the dependences Ic(H||) and
 R(H||) reveal oscillation behavior. It is shown that the appearance of oscillations and of reentrant
 behavior (vanishing of resistivity in definite ranges of H||) are due to the strong intrinsic pinning
 and to the effect of commensurability between the vortex lattice period and multilayer wavelength.
 The locations of Ic(H||) and R(H||) extrema correspond to the stable states of a commensurate vortex
 lattice. Our experimental data are in good quantitative agreement with Ivlev, Kopnin, and
 Pokrovsky (IKP) theory. It is shown that the values of the commensurability fields depend exclusively
 on the superlattice period s and anisotropy coefficient γ and do not depend on the type of materials
 used for multilayer preparation. The memory effect, i.e., dependence of the oscillation pattern
 on the magnetic history of the sample, is observed. It is shown experimentally that the state of
 the vortex matter in the layered superconductors is essentially different from that of type-II superconductors
 with a random distribution of the pinning centers. Investigation of oscillation and
 reentrance behavior may be used as a new tool for vortex lattice arrangement study in layered superconductors.
 The essential advantage of this method is connected with its simplicity and with the possibility
 of using it in arbitrary large fields. Investigations of the commensurate states may be used
 for rather precise determination of the anisotropy coefficient γ.