$^{11}$B NMR detection of the magnetic field distribution in the mixed superconducting state of MgB$_2$

Details $^{11}$B NMR detection of the magnetic field distribution in the mixed superconducting state of MgB$_2$ $^{11}$B NMR detection of the magnetic field distribution in the mixed superconducting state of MgB$_2$

2001-07-24

arxiv.org/abs/cond-mat/0107511v1

Physics

Condensed Matter

Superconductivity

Scientific paper

10.1103/PhysRevB.65.012510

The temperature dependence of the magnetic field distribution in the mixed superconducting phase of randomly oriented MgB$_2$ powder was probed by $% ^{11}$B NMR spectroscopy. Below the temperature of the second critical ($B_{% {c2}}$) field, $T_{{c2}}\approx 27$K, our spectra reveal two NMR signal components, one mapping the magnetic field distribution in the mixed superconducting state and the other one arising from the normal state. The complementary use of bulk magnetization and NMR measurements reveals that MgB$_2$ is an anisotropic superconductor with a $B_{c2}^c<2.35$ Tesla anisotropy parameter $\gamma\approx 6$.

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