Diamond Magnetometry of Superconducting Thin Films
arXiv:1308.2689 · doi:10.1103/PhysRevB.89.054509
Abstract
In recent years diamond magnetometers based on the nitrogen-vacancy (NV) center have been of considerable interest for magnetometry applications at the nanoscale. An interesting application which is well suited for NV centers is the study of nanoscale magnetic phenomena in superconducting materials. We employ the magnetic sensitivity of NV centers in diamond to interrogate the magnetic properties of a thin-layer yttrium barium copper oxide (YBCO) superconductor. Using fluorescence-microscopy methods and samples integrated with an NV sensor on a microchip, we measure the temperature of phase transition in the layer to be 70.0(2) K, and the penetration field of vortices to be 46(4) G. We observe the pinning of the vortices in the layer at 65 K, and estimate their density after cooling the sample in a ~ 10 G field to be 0.45(1) μm^{-2}. These measurements are done with a 10 nm thick NV layer, so that high spatial resolution may be enabled in the future. Based on these results, we anticipate that this magnetometer could be useful for imaging the structure and dynamics of vortices. As an outlook, we present a fabrication method for a superconductor chip designed for this purpose.
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- Hybrid sensors based on colour centres in diamond and piezoactive layers
- High density NV sensing surface created via He^(+) ion implantation of (12)^C diamond
- Precision Measurements of Temperature and Chemical Potential of Quantum Gases
- Widefield imaging of superconductor vortices with electron spins in diamond
- Laser modulation of superconductivity in a cryogenic widefield nitrogen-vacancy microscope
- Quantum metrology with non-equilibrium steady states of quantum spin chains
- Spatially - resolved study of the Meissner effect in superconductors using NV-centers-in-diamond optical magnetometry
- Magnetic field imaging by hBN quantum sensor nanoarray
- Mapping Dynamical Magnetic Responses of Ultra-thin Micron-size Superconducting Films using Nitrogen-vacancy Centers in Diamond
- Apparent delocalisation of the current flow in metallic wires observed with diamond nitrogen-vacancy magnetometry
- Internal decoherence in nano-object interferometry due to phonons
- All-Optical and Microwave-Free Detection of Meissner Screening using Nitrogen-Vacancy Centers in Diamond
- Real-space probing of the local magnetic response of thin-film superconductors using single spin magnetometry
- Diamond Magnetometry of Meissner Currents in a Superconducting Film
- Measurements of the magnetic properties of conduction electrons
- 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
- Isotope engineering of silicon and diamond for quantum computing and sensing applications