Magnetic imaging of the paramagnetic Meissner effect in the granular high-Tc superconductor Bi2Sr2CaCu2Ox
J.R. Kirtley, A.C. Mota, M. Sigrist, and T.M. Rice
TL;DR
This study used scanning SQUID microscopy to visualize magnetic flux in a granular high-Tc superconductor, revealing spontaneous orbital magnetic moments responsible for the paramagnetic Meissner effect.
Contribution
First direct imaging of magnetic flux distribution showing spontaneous orbital moments in a granular high-Tc superconductor.
Findings
Spontaneous orbital magnetic moments are present in the sample.
The magnetic flux distribution is broad, indicating varied local magnetic fields.
A simple model explains the observed flux distribution.
Abstract
We have imaged the spatial distribution of magnetic flux on a granular sample of the high-temperature superconductor Bi2Sr2CaCu2Ox using a scanning SQUID microscope. Our results establish the presence of spontaneous orbital magnetic moments which were suggested to be the origin of the paramagnetic response of these materials. The signature of the orbital magnetic moments is a rather broad distribution of local magnetic fields at the surface of the sample. A simple model for the distribution is presented.
Peer Reviews
No public reviews on file for this paper yet. If you reviewed it on a platform where reviews are public (OpenReview, ICLR, NeurIPS, ICML), you can paste yours below so the community can read it here.
Videos
No videos yet. Explain this paper in a talk, walkthrough, or lecture? Add one.
Taxonomy
TopicsPhysics of Superconductivity and Magnetism · High-pressure geophysics and materials · Magnetic properties of thin films