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Author Terentiev, A. ♦ Watkins, D. B. ♦ De Long, L. E. ♦ Morgan, D. J. ♦ Ketterson, J. B.
Source United States Department of Energy Office of Scientific and Technical Information
Content type Text
Language English
Subject Keyword MATERIALS SCIENCE ♦ MEISSNER-OCHSENFELD EFFECT ♦ NIOBIUM ♦ THIN FILMS ♦ RELAXATION ♦ PARAMAGNETISM ♦ THICKNESS ♦ MAGNETIZATION ♦ DIAMAGNETISM ♦ SUPERCONDUCTING FILMS ♦ COOLING ♦ TYPE-II SUPERCONDUCTORS ♦ CRITICAL TEMPERATURE ♦ TRANSITION TEMPERATURE ♦ MAGNETIC FLUX
Abstract The {open_quotes}Wohlleben effect{close_quotes} (paramagnetic Meissner effect) is found in uniform applied magnetic fields only above a threshold value H{sub 0}{approx}10{sup 2}&hthinsp;Oe for field-cooled Nb films of thickness less than 1000 {Angstrom}. The initial diamagnetic magnetization observed upon field cooling to fixed temperatures just below T{sub c} gives way to a logarithmic time relaxation toward paramagnetic values comparable to the critical state magnetization over a period of several hours (normalized rate S{approx}0.1), implying that the development of the paramagnetic state is moderated by fast flux creep processes. Small field gradients {approx}10{endash}20 mOe/cm are found to influence the occurrence of the effect for applied fields H{lt}H{sub 0}. {copyright} {ital 1999} {ital The American Physical Society}
ISSN 01631829
Educational Use Research
Learning Resource Type Article
Publisher Date 1999-07-01
Publisher Place United States
Journal Physical Review, B: Condensed Matter
Volume Number 60
Issue Number 2


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