Studying Quantum Materials with Scanning SQUID Microscopy
Eylon Persky, Ilya Sochnikov, Beena Kalisky
Abstract
Electronic correlations give rise to fascinating macroscopic phenomena such\nas superconductivity,magnetism, and topological phases of matter. Although\nthese phenomena manifest themselves macroscopically, fully understanding\nthe underlying microscopic mechanisms often requires probing on multiple\nlength scales. Spatial modulations on the mesoscopic scale are especially\nchallenging to probe, owing to the limited range of suitable experimental\ntechniques. Here, we review recent progress in scanning superconducting\nquantum interference device (SQUID) microscopy. We demonstrate how\nscanning SQUID combines unmatched magnetic field sensitivity and highly\nversatile designs, by surveying discoveries in unconventional superconductivity,\nexotic magnetism, topological states, and more. Finally, we discuss how\nSQUID microscopy can be further developed to answer the increasing demand\nfor imaging new quantum materials.