M
Michael A. Hayward
Researcher at University of Oxford
Publications - 178
Citations - 7763
Michael A. Hayward is an academic researcher from University of Oxford. The author has contributed to research in topics: Perovskite (structure) & Oxide. The author has an hindex of 34, co-authored 171 publications receiving 7093 citations. Previous affiliations of Michael A. Hayward include University of Liverpool & Centre national de la recherche scientifique.
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Journal ArticleDOI
Strongly linked current flow in polycrystalline forms of the superconductor MgB2.
David C. Larbalestier,L. D. Cooley,M.O. Rikel,A. A. Polyanskii,Jianyi Jiang,Satyabrata Patnaik,X. Y. Cai,D.M. Feldmann,Alex Gurevich,A.A. Squitieri,M.T. Naus,C. B. Eom,Eric E. Hellstrom,Robert J. Cava,K. A. Regan,N. Rogado,Michael A. Hayward,T. He,Joanna S.G. Slusky,Peter G. Khalifah,K. Inumaru,M. K. Haas +21 more
TL;DR: The combined magnetization, magneto-optical, microscopy and X-ray investigations show that the supercurrent density is mostly determined by flux pinning, rather than by the grain boundary connectivity, suggesting that this new superconductor class is not compromized by weak-link problems.
Journal ArticleDOI
Strongly linked current flow in polycrystalline forms of the new superconductor MgB2
David Larbalestier,M.O. Rikel,L.D. Cooley,A. A. Polyanskii,Jianyi Jiang,Satyabrata Patnaik,X.Y. Cai,D.M. Feldmann,Alex Gurevich,A.A. Squitieri,M.T. Naus,Chang-Beom Eom,Eric E. Hellstrom,Robert J. Cava,K. A. Regan,N. Rogado,Michael A. Hayward,T. He,Joanna S.G. Slusky,Peter G. Khalifah,K. Inumaru,M. Haas +21 more
TL;DR: In this paper, the discovery of superconductivity at 39 K in MgB2 has raised many issues, such as whether this new superconductor resembles a high-temperature cuprate super-conductor or a low-treme metallic super-conductors in terms of its current carrying characteristics in applied magnetic fields.
Journal ArticleDOI
Superconductivity in the non-oxide perovskite MgCNi3.
T. He,Qingzhen Huang,Qingzhen Huang,Arthur P. Ramirez,Yu-Chiun Wang,K. A. Regan,N. Rogado,Michael A. Hayward,M. K. Haas,Joanna S.G. Slusky,K. Inumara,H. W. Zandbergen,Nai Phuan Ong,Robert J. Cava +13 more
TL;DR: The high relative proportion of Ni in MgCNi3 suggests that magnetic interactions are important, and the lower Tc of this three-dimensional compound—when compared to the LnNi2B2C family—contrasts with conventional ideas regarding the origins of superconductivity.
Journal ArticleDOI
High critical current density and enhanced irreversibility field in superconducting MgB2 thin films
C. B. Eom,Mk K. Lee,Jh H. Choi,Lj J. Belenky,Xueyan Song,L. D. Cooley,Mt T. Naus,Satyabrata Patnaik,Jianyi Jiang,M.O. Rikel,A. A. Polyanskii,Alex Gurevich,Xy Y. Cai,Sd D. Bu,Se E. Babcock,Ee E. Hellstrom,D. C. Larbalestier,N. Rogado,Ka A. Regan,Michael A. Hayward,T. He,Js S. Slusky,K. Inumaru,Mk K. Haas,R. J. Cava +24 more
TL;DR: It is shown that MgB2 thin films that are alloyed with oxygen can exhibit a much steeper temperature dependence of H*(T) than is observed in bulk materials, yielding an H* value at 4.2 K greater than 14 T.
Journal ArticleDOI
Thin Film Magnesium Boride Superconductor with Very High Critical Current Density and Enhanced Irreversibility Field
Chang-Beom Eom,M. K. Lee,J. H. Choi,L. J. Belenky,Xueyan Song,L. D. Cooley,M.T. Naus,Satyabrata Patnaik,Jianyi Jiang,M.O. Rikel,A. A. Polyanskii,Alex Gurevich,X.Y. Cai,Sang Don Bu,Susan E. Babcock,Eric E. Hellstrom,D. C. Larbalestier,N. Rogado,K. A. Regan,Michael A. Hayward,T. He,Joanna S.G. Slusky,K. Inumaru,M. K. Haas,Robert J. Cava +24 more
TL;DR: In this paper, it was shown that MgB_2 thin films can exhibit a much steeper temperature dependence of H*(T) than is observed in bulk materials, yielding H *(4.2 K) above 14 T.