Magnetic Penetration Depth in Unconventional Superconductors

Abstract

This topical review summarizes various features of magnetic penetration depth in unconventional superconductors. Precise measurements of the penetration depth as a function of temperature, magnetic field and crystal orientation can provide detailed information about the pairing state. Examples are given of unconventional pairing in hole- and electron-doped cuprates, organic and heavy fermion superconductors. The ability to apply an external magnetic field adds a new dimension to penetration depth measurements. We discuss how field dependent measurements can be used to study surface Andreev bound states, nonlinear Meissner effects, magnetic impurities, magnetic ordering, proximity effects and vortex motion. We also discuss how penetration depth measurements as a function of orientation can be used to explore superconductors with more than one gap and with anisotropic gaps. Details relevant to the analysis of penetration depth data in anisotropic samples are also discussed.

topical review, 57 pages, 219 references

References in corpus (3)

• Supercurrent in Nodal Superconductors
• Anisotropic s-wave superconductivity in single crystals CaAlSi from penetration depth measurements
• Field-dependent diamagnetic transition in magnetic superconductor $S{m}_{1.85}C{e}_{0.15}Cu{O}_{4-y}$

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• Unconventional London penetration depth in Ba(Fe0.93Co0.07)2As2 single crystals
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• Non-exponential London penetration depth in Ba${}_{1-}$K${}_x$Fe${}_2$As${}_2$ single crystals
• Precise measurements of radio-frequency magnetic susceptibility in (anti)ferromagnetic materials
• Two-gap superconductivity in single crystal Lu${}_2$Fe${}_3$Si${}_5$ from penetration depth measurements
• Penetration depth, lower critical fields, and quasiparticle conductivity in Fe-arsenide superconductors
• Local-moment ferromagnetism and unusual magnetic domains in Fe${}_{1/4}$TaS${}_2$ crystals
• Coexistence of Long-Range Magnetic Order and Superconductivity from Campbell Penetration Depth Measurements
• Nearly Ferromagnetic Superconductors
• Interplay of Local-Moment Ferromagnetism and Superconductivity in ErRh${}_4$B${}_4$ Single Crystals