Abstract
Critical fields and critical currents of a great number of niobium nitride samples with and without different amounts of zirconium have been measured. The samples for these measurements have been prepared by diffusion of nitrogen into heated niobium and niobium-zirconium wires under various conditions. For the zero upper critical field of NbN the extrapolated value (153±3) kOe has been found. The quenching curves of most of the samples show very pronounced peak effects in the high field region with a steep slope close to the upper critical field, which decreases with increasing amount of zirconium.
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On leave of absence from the University of Giessen.
Supported by the U.S. Air Force Office of Scientific Research.
We would like to thank Professor B.Lax for the generous opportunity and excellent facilities to perform these measurements in his laboratory, and Dr. D. B.Montgomery for his kind advice and continuous assistance during the whole experimental procedure. We also wish to thank the Deutsche Forschungsgemeinschaft and the Stiftung Volkswagenwerk for financial support of this work.
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Hechler, K., Saur, E. & Wizgall, H. Critical data of niobium nitride in transverse magnetic fields. Z. Physik 205, 400–408 (1967). https://doi.org/10.1007/BF01325595
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DOI: https://doi.org/10.1007/BF01325595