A magnetization and $^{11}$B NMR study of Mg$_{1-x}$Al$_x$B$_2$ superconductors

C. Christides; G. Papavassiliou; I. Margiolaki; I. Maurin; K. Prassides; M. Fardis; M. Karayanni; M. Pissas

arxiv: cond-mat/0111351 · v1 · submitted 2001-11-19 · ❄️ cond-mat.supr-con · cond-mat.mtrl-sci

A magnetization and ¹¹B NMR study of Mg_(1-x)Al_xB₂ superconductors

M. Pissas , G. Papavassiliou , M. Karayanni , M. Fardis , I. Maurin , I. Margiolaki , K. Prassides , C. Christides This is my paper

classification ❄️ cond-mat.supr-con cond-mat.mtrl-sci

keywords magneticdistributionfieldmagnetizationpureal-dopinganisotropyband

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We demonstrate for the first time the magnetic field distribution of the pure vortex state in lightly doped Mg$_{1-x}$Al$_x$B$_2$ ($x\leq 0.025$) powder samples, by using $^{11}$B NMR in magnetic fields of 23.5 and 47 kOe. The magnetic field distribution at T=5 K is Al-doping dependent, revealing a considerable decrease of anisotropy in respect to pure MgB$_2$. This result correlates nicely with magnetization measurements and is consistent with $\sigma$-band hole driven superconductivity for MgB$_2$.

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A magnetization and ¹¹B NMR study of Mg_(1-x)Al_xB₂ superconductors

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