AC losses in high pressure synthesized MgB2 bulk rings measured by a transformer method

V. Meerovich, V. Sokolovsky, T. Prikhna, W. Gawalek, T. Habisreuther

Research output: Contribution to journalArticlepeer-review

9 Scopus citations


Recently developed manufacturing technologies use high pressure and various doping additions to prepare bulk MgB2-based materials with a high critical current density measured by the magnetization method. We use a contactless transformer method, which is based on studying the superconductor response to an induced transport current, to measure AC losses in bulk MgB 2 rings synthesized under high pressure. The obtained dependence of the losses on the primary current (applied magnetic field) is fitted by a power law with an exponent of ∼2.1 instead of the cubic dependence predicted by Bean's model and power law electric field-current density (E-J) characteristics with a large exponent. An unusually strong dependence of the AC losses on the frequency is also observed. It is shown that the E-J characteristic of bulk MgB2 is well fitted by the dependence used in the extended critical state model based on account of the viscous vortex motion in the flux flow regime. Numerical simulation using this E-J characteristic gives current and frequency AC loss dependences that agree well with the experimental results.

Original languageEnglish
Article number035015
JournalSuperconductor Science and Technology
Issue number3
StatePublished - 1 Mar 2013

ASJC Scopus subject areas

  • Ceramics and Composites
  • Condensed Matter Physics
  • Metals and Alloys
  • Electrical and Electronic Engineering
  • Materials Chemistry


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