Nonlinear microwave response of MgB2

Abstract

We calculate the intrinsic nonlinear microwave response of the two gap superconductor MgB2 in the clean and dirty limits. Due to the small value of the pi band gap, the nonlinear response at low temperatures is larger than for a single gap Bardeen-Cooper-Schrieffer (BCS) s-wave superconductor with a transition temperature of 40 K. Comparing this result with the intrinsic nonlinear d-wave response of YBa2Cu3O7 (YBCO) we find a comparable response at temperatures around 20 K. Due to its two gap nature, impurity scattering in MgB2 can be used to reduce the nonlinear response if the scattering rate in the pi band is made larger than the one in the sigma band.

4 pages, 4 figures

References in corpus (6)

• Beyond Eliashberg superconductivity in MgB2: anharmonicity, two-phonon scattering, and multiple gaps
• Two-gap superconductivity in MgB${}_2$: clean or dirty?
• The Nonlinear Meissner Effect in Unconventional Superconductors
• Multiband model for penetration depth in MgB2
• Fermi surface topology and the upper critical field in two-band superconductors - application to MgB2
• Microwave intermodulation distortion of MgB2 thin films

Cited by in corpus (9)

• Direct measurement of the magnetic penetration depth by magnetic force microscopy
• Theory of the critical current in two-band superconductors with application to MgB2
• High-order nonlinear terahertz probing of the two-band superconductor MgB${}_2$: Third- and fifth-order harmonic generation
• Intrinsic nonlinearity probed by intermodulation distortion microwave measurements on high quality MgB2 thin films
• Measurement of the magnetic penetration depth of a superconducting MgB${}_2$ thin film with a large intraband diffusivity
• Nonlinear current response of one- and two-band superconductors
• Effect of gap suppression by superfluid current on nonlinear microwave response of d-wave superconductors
• Mgb2 Nonlinear Properties Investigated under Localized High RF Magnetic Field Excitation
• MgB2 nonlinear properties investigated under localized high rf magnetic field excitation-report 2