Measuring the Penetration Depth Anisotropy in MgB${}_2$ using Small-Angle Neutron Scattering

Abstract

Using small-angle neutron scattering we have measured the misalignment between an applied field of 4 kOe and the flux-line lattice in MgB${}_2$, as the field is rotated away from the c axis by an angle $\theta$. The measurements, performed at 4.9 K, showed the vortices canting towards the c axis for all field orientations. Using a two-band/two-gap model to calculate the magnetization we are able to fit our results yielding a penetration depth anisotropy, $\glam = 1.1 \pm 0.1$.

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References in corpus (18)

• Superconductivity of metallic boron in MgB_2
• Beyond Eliashberg superconductivity in MgB2: anharmonicity, two-phonon scattering, and multiple gaps
• Temperature and field dependence of the anisotropy of MgB2
• Ginzburg-Landau theory of vortices in a multi-gap superconductor
• Specific heat of single crystal MgB_2: a two-band superconductor with two different anisotropies
• Multiband model for penetration depth in MgB2
• Mixed state properties of superconducting MgB2 single crystals
• Macroscopic anisotropy in superconductors with anisotropic gaps
• Temperature dependent anisotropy of the penetration depth and coherence length in MgB$_2
• Anisotropies of the lower and upper critical fields in MgB${}_2$ single crystals
• Anisotropy of superconducting MgB2 as seen in electron spin resonance and magnetization data
• Anisotropy of the upper critical field in superconductors with anisotropic gaps. Anisotropy parameters of MgB2
• MgB2 single crystals: high pressure growth and anisotropic properties
• Temperature-dependent $H_{c2}$ anisotropy in MgB${}_2$ as inferred from measurements on polycrystals
• Free energy and torque for superconductors with different anisotropies of H_{c2} and lambda
• Two-band Effects in the Angular Dependence of Hc2 of MgB2 Single Crystals
• Anisotropy and internal field distribution of MgB2 in the mixed state at low temperatures
• ${}^{11}$B NMR detection of the magnetic field distribution in the mixed superconducting state of MgB${}_2$

Cited by in corpus (8)

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• Simultaneous Evidence for Pauli Paramagnetic Effects and Multiband Superconductivity in KFe${}_2$As${}_2$ by Small-Angle Neutron Scattering Studies of the Vortex Lattice
• Anisotropy and multiband superconductivity in Sr2RuO4
• Persistence of Metastable Vortex Lattice Domains in MgB2 in the Presence of Vortex Motion
• Anisotropy and Penetration Depth of MgB${}_2$ from ${}^{11}$B NMR
• Field-angle dependent vortex lattice phase diagram in MgB2