A new Scanning Tunneling Microscope at magnetic fields of 22 T  

Session

Stream 5: Late Breaking

Authors

Mrs Marta Fernandez-Lomana (1), Dr Beilun Wu (1), Mr Francisco Martín (1), Mrs Raquel Sanchez (1), Mr Rafael Álvarez (1), Mr Jose María Castilla (1), Mrs Sara Delgado (1), Dr Isabel Guillamón (1, 2), Dr Hermann Suderow (1, 2)

Affiliations

1. 1Laboratorio de Bajas Temperaturas, Departamento de Física de la Materia Condensada, Instituto de ciencia de Materiales Nicolás Cabrera, Condensed Matter Physics Center (IFIMAC), Universidad Autónoma de Madrid, E-28049
2. Unidad Asociada de Bajas Temperaturas y Altos Campos Magnéticos, UAM, CSIC, Cantoblanco, E-28049 Madrid, Spain

Keywords

STM Magnetic field  vortex  dilution

Abstract text

A scanning tunneling microscope (STM) has been successfully installed in a dilution refrigerator with a 22T superconducting magnet. The set-up is mechanically isolated using a low vibration floating floor. We describe significant improvements in the thermalization and filtering of the wiring used in STM measurements, including a new high frequency filter and its characterization through ultra high resolution (8microeV) measurements in Al. We have successfully used the STM to measure single atom point contacts of gold, the vortex lattice in 2H-NbSe₂ and have acquired atomic resolution images in 2H-NbSe₂ above 20T. New results in several iron based superconductors will be also presented.

References

[1] H. Suderow et al. Review of Scientific Instruments 82, 033711 (2011

[2]ahombrosdegigantescienciaytecnologia.wordpress.com/2016/07/22/el-microscopio-de-efecto-tunel-binnig

[3] Oxford Instruments’ 22 Tesla superconducting magnet system commissioned at the UAM (2018

[4] "Ultra high magnetic field STM and vibration isolation methods. To be published."