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

Abstract

The temperature dependence of the magnetic field distribution in the mixed superconducting phase of randomly oriented MgB${}_2$ powder was probed by 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 $\gamma \approx 6$.

References in corpus (13)

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Cited by in corpus (13)

• Peak effect in single crystal MgB${}_2$ superconductor for $\mathbf{H}\parallel c$-axis
• Anisotropy parameters of superconducting MgB${}_2$
• Unusual effects of anisotropy on the specific heat of ceramic and single crystal MgB2
• Evidence for High-frequency Phonon Mediated S-wave Superconductivity : 11B-NMR Study of Al-doped MgB2
• Doping-induced superconductivity of ZrB${}_2$ and HfB${}_2$
• ${}^{11}$B and ${}^{27}$Al NMR spin-lattice relaxation and Knight shift study of Mg${}_{1-x}$Al${}_x$B${}_2$. Evidence for anisotropic Fermi surface
• A magnetization and ${}^{11}$B NMR study of Mg${}_{1-x}$Al${}_x$B${}_2$ superconductors
• ^25Mg NMR study of the MgB_2 superconductor
• Surface states and their possible role in the superconductivity of MgB2
• Measuring the Penetration Depth Anisotropy in MgB${}_2$ using Small-Angle Neutron Scattering
• ${}^{11}$B NMR study of pure and lightly carbon doped MgB${}_2$ superconductors
• Anisotropy and Penetration Depth of MgB${}_2$ from ${}^{11}$B NMR
• Magnetic field induced orientation of superconducting MgB${}_2$ crystallites determined by X-ray diffraction