Related papers: Imaging the Meissner Effect and Flux Trapping of Superconductors under High Pressure using N-V Centers

Imaging the Meissner Effect and Flux Trapping of Superconductors under High Pressure using N-V Centers

URL: http://arxiv.org/abs/2501.14504v1
Date: Fri, 24 Jan 2025 14:02:09 GMT
Title: Imaging the Meissner Effect and Flux Trapping of Superconductors under High Pressure using N-V Centers
Authors: Cassandra Dailledouze, Antoine Hilberer, Martin Schmidt, Marie-Pierre Adam, Loïc Toraille, Kin On Ho, Anne Forget, Dorothée Colson, Paul Loubeyre, Jean-François Roch,
Abstract summary: N-V magnetometry can also map superconductivity with micrometer resolution. We show that N-V magnetometry can also map superconductivity with micrometer resolution. This approach could enable detailed investigations of superconductivity of a broad range of materials under high-pressure conditions.
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Abstract: Pressure is a key parameter for tuning or revealing superconductivity in materials and compounds. Many measurements of superconducting phase transition temperatures have been conducted using diamond anvil cells (DACs), which provide a wide pressure range and enable concomitant microscopic structural characterization of the sample. However, the inherently small sample volumes in DACs complicate the unambiguous detection of the Meissner effect, the hallmark of superconductivity. Recently, the Meissner effect in superconductors within a DAC was successfully demonstrated using diamond nitrogen-vacancy (N-V) widefield magnetometry, a non-invasive optical technique. In this work, we show that N-V magnetometry can also map superconductivity with micrometer resolution. We apply this technique to a microcrystal of HgBa$_2$Ca$_2$Cu$_3$O$_{8+\delta}$ (Hg-1223) mercury-based cuprate superconductor under 4 GPa of pressure. The method is capable to detect the magnetic field expulsion and heterogeneities in the sample, visible in a set of characteristic parameters as the local critical temperature $T_{c}$. Flux pinning zones are identified through flux trapping maps. This approach could enable detailed investigations of superconductivity of a broad range of materials under high-pressure conditions.

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