Mapping Dynamical Magnetic Responses of Ultra-thin Micron-size Superconducting Films using Nitrogen-vacancy Centers in Diamond

Abstract

Two-dimensional superconductors have attracted growing interest because of their scientific novelty, structural tunability, and useful properties. Studies of their magnetic responses, however, are often hampered by difficulties to grow large-size samples of high quality and uniformity. We report here an imaging method that employed NV- centers in diamond as sensor capable of mapping out the microwave magnetic field distribution on an ultrathin superconducting film of micron size. Measurements on a 33nm-thick film and a 125nm-thick bulk-like film of $B{i}_{2}S{r}_{2}CaC{u}_2{O}_{8+\delta }$ revealed that the ac Meissner effect (or repulsion of ac magnetic field) set in at 78K and 91K, respectively; the latter was the superconducting transition temperature (Tc) of both films. The unusual ac magnetic response of the thin film presumably was due to thermally excited vortex-antivortex diffusive motion in the film. Spatial resolution of our ac magnetometer was limited by optical diffraction and the noise level was at 14 $\mu T/H{z}^{1/2}$. The technique could be extended with better detection sensitivity to extract local ac conductivity/susceptibility of ultrathin or monolayer superconducting samples as well as ac magnetic responses of other two-dimensional exotic thin films of limited lateral size.

arXiv comment21 pages, 4 figures

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Cited by in corpus (10)

• Laser modulation of superconductivity in a cryogenic widefield nitrogen-vacancy microscope
• Observation of Superconductivity Induced Ferromagnetism in an Fe-Chalcogenide Superconductor
• Single-spin qubit magnetic spectroscopy of two dimensional superconductivity
• Spin dynamics of a solid-state qubit in proximity to a superconductor
• All-Optical and Microwave-Free Detection of Meissner Screening using Nitrogen-Vacancy Centers in Diamond
• Mapping AC Susceptibility with Quantum Diamond Microscope
• Studying Critical Parameters of Superconductor via Diamond Quantum Sensors
• Tunable magnetic field source for magnetic field imaging microscopy
• Low-field all-optical detection of superconductivity using NV nanodiamonds
• Widefield NV Magnetic Field Reconstruction for Probing the Meissner Effect and Critical Current Density under Pressure