低温工学
Online ISSN : 1880-0408
Print ISSN : 0389-2441
ISSN-L : 0389-2441
研究論文
第三高調波誘導法による超電導体の臨界電流密度の評価
—超電導薄膜·バルク材の臨界電流密度—
馬渡 康徳山崎 裕文中川 愛彦
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2005 年 40 巻 8 号 p. 346-353

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We have investigated an inductive method measuring third-harmonic voltages to evaluate the local critical current density Jc in superconducting films and bulk materials. When a sinusoidal drive current I0cosωt flows in a small coil close to the flat surface of superconductors, harmonic voltages Vncos(nωt+θn) are induced in the coil, because of the nonlinear response of superconductors. We have considered the AC response of superconductors and the induced third-harmonic voltage V3 as the function of I0, and we present the precise technique to measure the critical current density Jc in superconducting films as well as Jc in bulk superconductors.
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© 2005 公益社団法人 低温工学・超電導学会 (旧 社団法人 低温工学協会)
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