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A new perspective to AC magnetic susceptibility measurements in an unbalanced mutual inductance bridge

Authors
Journal
Physica C Superconductivity
0921-4534
Publisher
Elsevier
Publication Date
Identifiers
DOI: 10.1016/s0921-4534(01)00762-6
Keywords
  • Ac Magnetic Susceptibility
  • Mutual Inductance Bridge
  • Yba2Cu3O7− δ
Disciplines
  • Physics

Abstract

Abstract AC magnetic susceptibility measurements using an unbalanced mutual inductance bridge were performed on a bulk YBa 2Cu 3O 7− δ superconductor at frequencies f=110–800 Hz and AC fields B=0.2–2 mT. By deliberately leaving the bridge unbalanced, the effect of phase drift on the measurements is shown. Because of this phase drift, we found that the hump appearing in the in-phase measurements (associated with χ ′) is the same AC loss peak appearing in the out-of-phase measurements (associated with χ ″). In addition, since the behavior of the AC susceptibility data we obtained is in agreement with the literature, conflicting results by other groups can be resolved by a simple consideration of this phase drift.

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