Radio-frequency magnetic response of vortex lattices undergoing structural transformations in superconducting borocarbide crystals

R. Prozorov; V. G. Kogan; M. D. Vannette; S. L. Bud’ko; P. C. Canfield

doi:10.1103/PhysRevB.76.094520

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Radio-frequency magnetic response of vortex lattices undergoing structural transformations in superconducting borocarbide crystals

R. Prozorov, V. G. Kogan, M. D. Vannette, S. L. Bud’ko, P. C. Canfield

DOI 10.1103/PhysRevB.76.094520 · Physical Review B

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Abstract

We report a clear anomaly in the rf response of tunnel-diode resonator measured in rare earth nickel borocarbide crystals with dc applied magnetic field along the crystallographic c axis. We associate the anomaly in the dynamic magnetic susceptibility χ with a structural transition in the vortex lattice. χ is sensitive to the Campbell penetration depth λC of the rf perturbation into the mixed state. λC depends on the vortex lattice elastic moduli, which in turn depend on the vortex lattice structure. Using this technique, we map the high-field transition line for the square-to-rhombic transformation of the vortex lattice and provide a qualitative argument in favor of thermal vortex fluctuations as a major cause driving the transition.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
YNi2B2C Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	15.2	Pressure not reported	onset
LuNi2B2C Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	16.2	Pressure not reported	onset