Synthesis and Characterization of MoxNb1-x Films Superconducting at 100-200mK

23 Jul 2019, 17:45
1h 15m
Piazza Città di Lombardia (Milano)

Piazza Città di Lombardia

Milano

Piazza Città di Lombardia, 1, 20124 Milano MI
Poster Low Temperature Detector fabrication techniques and materials Poster session

Speaker

Dr Volodymyr Yefremenko (High Energy Physics Division, Argonne National Laboratory)

Description

We have developed a new transition edge sensor (TES) material with transition temperature in the range 100-200mK. The new material is a solid solution of two superconducting components, MoxNb1-x, co-sputtered from two high-purity single-component targets (Mo and Nb) . The transition temperature, Tc, has a minimum (dTc/dx=0) at intermediate concentration of the components. We have optimized deposition parameters and composition to provide films with a sharp superconducting transition at ~150mK. We investigated structural features of the films and surface morphology using X-ray diffraction (XRD) and Scanning Electron Microscopy. The XRD measurements indicate that grown films are polycrystalline, with a preferred orientation along the (110) crystal direction, and a clear correlation between superconducting properties and film microstructure.

Less than 5 years of experience since completion of Ph.D N
Student (Ph.D., M.Sc. or B.Sc.) N

Primary authors

Dr Volodymyr Yefremenko (High Energy Physics Division, Argonne National Laboratory) Dr Jianjie Zhang (High Energy Physics Division, Argonne National Laboratory) Ms Marharyta Lisovenko (Materials Science Division, Argonne National Laboratory) Dr Pete Barry (High Energy Physics Division, Argonne National Laboratory) Dr Amy Bender (High Energy Physics Division, Argonne National Laboratory) Dr Thomas Cecil (High Energy Physics Division, Argonne National Laboratory) Dr Clarence Chang (High Energy Physics Division, Argonne National Laboratory) Dr Ralu Divan (Center for Nanoscale Materials, Argonne National Laboratory) Stephen Kuhlmann (Argonne National Laboratory) Amy Lowitz (University of Chicago - Kavli Institute for Cosmological Physics) Dr Valentine Novosad (Materials Science Division,Physics Division, Argonne National Laboratory) Dr Stephen Padin (High Energy Physics Division) Mr John Pearson (Materials Science Division, Argonne National Laboratory) Dr Gensheng Wang (High Energy Physics Division, Argonne National Laboratory)

Presentation Materials