Anisotropy in MgB2

Anisotropy and internal-field distribution of MgB2 in the mixed state at low temperatures

M. Angst,1,2,* D. Di Castro,1 D. G. Eshchenko,1,3 R. Khasanov,3,4,1 S. Kohout,1 I. M. Savic,5 A. Shengelaya,1 S. L. Bud’ko,2 P. C. Canfield,2 J. Jun,6 J. Karpinski,6 S. M. Kazakov,6 R. A. Ribeiro,2,† and H. Keller1 1Physik-Institut der Universität Zürich, CH-8057 Zürich, Switzerland 2Ames Laboratory and Department of Physics and Astronomy, Iowa State University, Ames, Iowa 50011, USA 3Paul Sche...

Anisotropy of the upper critical field and critical current in single crystal MgB2

Anisotropy of the critical current in MgB2 tapes made of high energy milled precursor powder

For applications of MgB2 wires or tapes, high critical currents in high magnetic fields are essential. By using tapes in superconducting coils the anisotropic behaviour of the critical current, i.e. the dependence on the direction of the external field in relation to the tape surface, has to be taken into account. The anisotropy of MgB2 tapes with mechanically alloyed (MA) precursor powder and ...

Magnetic anisotropy of thin sputtered MgB2 films on MgO substrates in high magnetic fields

Dramatic role of critical current anisotropy on flux avalanches in MgB2 films.

Anisotropic penetration of magnetic flux in MgB(2) films grown on vicinal sapphire substrates is investigated using magneto-optical imaging. Regular penetration above 10 K proceeds more easily along the substrate surface steps, the anisotropy of the critical current being 6%. At lower temperatures the penetration occurs via abrupt dendritic avalanches that preferentially propagate perpendicular...