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  Application of SQUIDs to low temperature and high magnetic field measurements-Ultra low noise torque magnetometry

Arnold, F., Naumann, M., Lühmann, T., Mackenzie, A. P., & Hassinger, E. (2018). Application of SQUIDs to low temperature and high magnetic field measurements-Ultra low noise torque magnetometry. Review of Scientific Instruments, 89(2): 023901, pp. 1-8. doi:10.1063/1.5011655.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0000-ED78-F Version Permalink: http://hdl.handle.net/21.11116/0000-0000-ED80-4
Genre: Journal Article

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 Creators:
Arnold, F.1, Author              
Naumann, M.1, Author              
Lühmann, Th.2, Author              
Mackenzie, A. P.3, Author              
Hassinger, E.1, Author              
Affiliations:
1Physics of Unconventional Metals and Superconductors, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_2466700              
2Physics of Quantum Materials, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863462              
3Andrew Mackenzie, Physics of Quantum Materials, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863463              

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 Abstract: Torque magnetometry is a key method to measure the magnetic anisotropy and quantum oscillations in metals. In order to resolve quantum oscillations in sub-millimeter sized samples, piezo-electric micro-cantilevers were introduced. In the case of strongly correlated metals with large Fermi surfaces and high cyclotron masses, magnetic torque resolving powers in excess of 10(4) are required at temperatures well below 1 K and magnetic fields beyond 10 T. Here, we present a new broadband read-out scheme for piezo-electric micro-cantilevers via Wheatstone-type resistance measurements in magnetic fields up to 15 T and temperatures down to 200 mK. By using a two-stage superconducting-quantum interference device as a null detector of a cold Wheatstone bridge, we were able to achieve a magnetic moment resolution of Delta m = 4 x 10(-15) J/T at maximal field and 700 mK, outperforming conventional magnetometers by at least one order of magnitude in this temperature and magnetic field range. Exemplary de Haas-van Alphen measurement of a newly grown delafossite, PdRhO2, was used to show the superior performance of our setup. Published by AIP Publishing.

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Language(s): eng - English
 Dates: 2018-02-022018-02-02
 Publication Status: Published in print
 Pages: -
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 Rev. Method: -
 Identifiers: ISI: 000426583500034
DOI: 10.1063/1.5011655
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Title: Review of Scientific Instruments
Source Genre: Journal
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Publ. Info: Melville, NY : AIP Publishing
Pages: - Volume / Issue: 89 (2) Sequence Number: 023901 Start / End Page: 1 - 8 Identifier: ISSN: 0034-6748
CoNE: /journals/resource/991042742033452