Magneto-optical studies of the uniform critical state in bulk MgB2

A. A. Polyanskii; A. Gurevich; J. Jiang; D. C. Larbalestier; S. L. Bud'ko; D. K. Finnemore; G. Lapertot; P. C. Canfield A. A. Polyanskii; A. Gurevich; J. Jiang; D. C. Larbalestier; S. L. Bud'ko; D. K. Finnemore; G. Lapertot; P. C. Canfield

doi:10.1088/0953-2048/14/10/301

Magneto-optical studies of the uniform critical state in bulk MgB2

Superconductivity 2009-11-07 v1

Authors: A. A. Polyanskii , A. Gurevich , J. Jiang , D. C. Larbalestier , S. L. Bud'ko , D. K. Finnemore , G. Lapertot , P. C. Canfield A. A. Polyanskii , A. Gurevich , J. Jiang , D. C. Larbalestier , S. L. Bud'ko , D. K. Finnemore , G. Lapertot , P. C. Canfield

View on arXiv ↗ PDF ↗ DOI ↗

Abstract

We present a detailed magneto-optical investigation of the magnetic flux penetration in polycrystalline MgB2 slabs made by direct reaction of B and Mg. Our results unambiguously indicate a uniform, Bean critical state magnetization behavior with almost no electromagnetic granularity. From the measured magnetic flux profiles we were able to extract the temperature dependence of the critical current density Jc(T). The Jc(T) value reaches 1.8x10^5 A/cm2 at 10K and 0.12T, in good agreement with global magnetization measurements.

Keywords

magneto-optical critical state MgB2 flux penetration critical current density

Cite

@article{arxiv.cond-mat/0107532,
  title  = {Magneto-optical studies of the uniform critical state in bulk MgB2},
  author = {A. A. Polyanskii and A. Gurevich and J. Jiang and D. C. Larbalestier and S. L. Bud'ko and D. K. Finnemore and G. Lapertot and P. C. Canfield A. A. Polyanskii and A. Gurevich and J. Jiang and D. C. Larbalestier and S. L. Bud'ko and D. K. Finnemore and G. Lapertot and P. C. Canfield},
  journal= {arXiv preprint arXiv:cond-mat/0107532},
  year   = {2009}
}

Magneto-optical studies of the uniform critical state in bulk MgB2

Abstract

Keywords

Cite

Related papers