
Logan Bishop-Van Horn
Ph.D. Student in Physics, admitted Autumn 2017
All Publications
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Imaging anisotropic vortex dynamics in FeSe
PHYSICAL REVIEW B
2019; 100 (2)
View details for DOI 10.1103/PhysRevB.100.024514
View details for Web of Science ID 000476686700006
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Cryogen-free variable temperature scanning SQUID microscope.
The Review of scientific instruments
2019; 90 (6): 063705
Abstract
Scanning Superconducting QUantum Interference Device (SQUID) microscopy is a powerful tool for imaging local magnetic properties of materials and devices, but it requires a low-vibration cryogenic environment, traditionally achieved by thermal contact with a bath of liquid helium or the mixing chamber of a "wet" dilution refrigerator. We mount a SQUID microscope on the 3 K plate of a Bluefors cryocooler and characterize its vibration spectrum by measuring SQUID noise in a region of sharp flux gradient. By implementing passive vibration isolation, we reduce relative sensor-sample vibrations to 20 nm in-plane and 15 nm out-of-plane. A variable-temperature sample stage that is thermally isolated from the SQUID sensor enables the measurement at sample temperatures from 2.8 K to 110 K. We demonstrate these advances by imaging inhomogeneous diamagnetic susceptibility and vortex pinning in optimally doped yttrium barium copper oxide above 90 K.
View details for DOI 10.1063/1.5085008
View details for PubMedID 31255038