Measuring magnetic field texture in correlated electron systems under extreme conditions.
basic_science · Level V
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- Record sourced from PubMed, PMID 31831663.
- Also identified by DOI 10.1126/science.aaw4278.
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Abstract
Pressure is a clean, continuous, and systematic tuning parameter among the competing ground states in strongly correlated electron systems such as superconductivity and magnetism. However, owing to the restricted access to samples enclosed in high-pressure devices, compatible magnetic field sensors with sufficient sensitivity are rare. We used nitrogen vacancy centers in diamond as a spatially resolved vector field sensor for material research under pressure at cryogenic temperatures. Using a single crystal of BaFe<sub>2</sub>(As<sub>0.59</sub>P<sub>0.41</sub>)<sub>2</sub> as a benchmark, we extracted the superconducting transition temperature, the local magnetic field profile in the Meissner state, and the critical fields. The method developed in this work offers a distinct tool for probing and understanding a range of quantum many-body systems.