London penetration depth measurements using tunnel diode resonators

Abstract

The London penetration depth $\lambda$ is the basic length scale for electromagnetic behavior in a superconductor. Precise measurements of $\lambda$ as a function of temperature, field, and impurity scattering have been instrumental in revealing the nature of the order parameter and pairing interactions in a variety of superconductors discovered over the past decades. Here we recount our development of the tunnel-diode resonator technique to measure $\lambda$ as a function of temperature and field in small single crystal samples. We discuss the principles and applications of this technique to study unconventional superconductivity in the copper oxides and other materials such as iron-based superconductors. The technique has now been employed by several groups worldwide as a precision measurement tool for the exploration of new superconductors.

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Cited by in corpus (9)

• Striped electronic phases in an incommensurately modulated van der Waals superlattice
• Possible unconventional pairing in $(\text{Ca,Sr}{)}_3(\text{Ir,Rh}{)}_4{\text{Sn}}_{13}$ superconductors revealed by controlling disorder
• Signature of point nodal superconductivity in the Dirac semimetal PdTe
• Magnetic signatures of pressure-induced multicomponent superconductivity in UTe${}_2$
• Quasiparticle spectroscopy in technologically-relevant niobium using London penetration depth measurements
• Linear magnetic susceptibility of anisotropic superconductors of cuboidal shape
• Single-gap Isotropic $s-$wave Superconductivity in Single Crystals ${\text{AuSn}}_4$
• Determination of the London penetration depth with the tunnel diode oscillator technique
• Determination of the Magnetic Penetration Depth from Finite-Element Susceptibility Calculations of Spheroidal and Cylindrical Superconductors