Microstructuring YbRh2Si2 for resistance and noise measurements down to ultra-low temperatures
The discovery of superconductivity in the quantum critical Kondo-lattice system YbRh _2 Si _2 at an extremely low temperature of 2 mK has inspired efforts to perform high-resolution electrical resistivity measurements down to this temperature range in highly conductive materials. Here we show that c...
| Main Authors: | , , , , , , , , , , , |
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| Format: | Article |
| Language: | English |
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IOP Publishing
2022-01-01
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| Series: | New Journal of Physics |
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| Online Access: | https://doi.org/10.1088/1367-2630/aca8c6 |
| _version_ | 1797748762646413312 |
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| author | Alexander Steppke Sandra Hamann Markus König Andrew P Mackenzie Kristin Kliemt Cornelius Krellner Marvin Kopp Martin Lonsky Jens Müller Lev V Levitin John Saunders Manuel Brando |
| author_facet | Alexander Steppke Sandra Hamann Markus König Andrew P Mackenzie Kristin Kliemt Cornelius Krellner Marvin Kopp Martin Lonsky Jens Müller Lev V Levitin John Saunders Manuel Brando |
| author_sort | Alexander Steppke |
| collection | DOAJ |
| description | The discovery of superconductivity in the quantum critical Kondo-lattice system YbRh _2 Si _2 at an extremely low temperature of 2 mK has inspired efforts to perform high-resolution electrical resistivity measurements down to this temperature range in highly conductive materials. Here we show that control over the sample geometry by microstructuring using focused-ion-beam techniques allows to reach ultra-low temperatures and increase signal-to-noise ratios (SNRs) tenfold, without adverse effects to sample quality. In five experiments we show four-terminal sensing resistance and magnetoresistance measurements which exhibit sharp phase transitions at the Néel temperature, and Shubnikov–de-Haas (SdH) oscillations between 13 T and 18 T where we identified a new SdH frequency of 0.39 kT. The increased SNR allowed resistance fluctuation (noise) spectroscopy that would not be possible for bulk crystals, and confirmed intrinsic $1/f$ -type fluctuations. Under controlled strain, two thin microstructured samples exhibited a large increase of $T_\mathrm{N}$ from 67 mK up to 188 mK while still showing clear signatures of the phase transition and SdH oscillations. Superconducting quantum interference device-based thermal noise spectroscopy measurements in a nuclear demagnetization refrigerator down to 0.95 mK, show a sharp superconducting transition at $T_\mathrm{c} = 1.2$ mK. These experiments demonstrate microstructuring as a powerful tool to investigate the resistance and the noise spectrum of highly conductive correlated metals over wide temperature ranges. |
| first_indexed | 2024-03-12T16:10:28Z |
| format | Article |
| id | doaj.art-6d2aa0ede47743e9bd083b522ea2a4de |
| institution | Directory Open Access Journal |
| issn | 1367-2630 |
| language | English |
| last_indexed | 2024-03-12T16:10:28Z |
| publishDate | 2022-01-01 |
| publisher | IOP Publishing |
| record_format | Article |
| series | New Journal of Physics |
| spelling | doaj.art-6d2aa0ede47743e9bd083b522ea2a4de2023-08-09T14:09:55ZengIOP PublishingNew Journal of Physics1367-26302022-01-01241212303310.1088/1367-2630/aca8c6Microstructuring YbRh2Si2 for resistance and noise measurements down to ultra-low temperaturesAlexander Steppke0https://orcid.org/0000-0001-6495-3917Sandra Hamann1Markus König2Andrew P Mackenzie3Kristin Kliemt4https://orcid.org/0000-0001-7415-4158Cornelius Krellner5Marvin Kopp6Martin Lonsky7https://orcid.org/0000-0002-8955-3095Jens Müller8Lev V Levitin9John Saunders10Manuel Brando11Max-Planck-Institute for Chemical Physics of Solids , Noethnitzer Str. 40, 01187 Dresden, Germany; University of Zurich , Winterthurerstr. 190, 8057 Zurich, Switzerland; Paul Scherrer Institute , Forschungsstr. 111, 5232 Villigen, SwitzerlandMax-Planck-Institute for Chemical Physics of Solids , Noethnitzer Str. 40, 01187 Dresden, Germany; Helmholtz-Zentrum Dresden-Rossendorf , Bautzner Landstr. 400, 01328 Dresden, GermanyMax-Planck-Institute for Chemical Physics of Solids , Noethnitzer Str. 40, 01187 Dresden, GermanyMax-Planck-Institute for Chemical Physics of Solids , Noethnitzer Str. 40, 01187 Dresden, Germany; Scottish Universities Physics Alliance, School of Physics and Astronomy, University of St Andrews , St Andrews, United KingdomPhysikalisches Institut, Goethe-Universität Frankfurt , Max-von-Laue-Str. 1, 60438 Frankfurt am Main, GermanyPhysikalisches Institut, Goethe-Universität Frankfurt , Max-von-Laue-Str. 1, 60438 Frankfurt am Main, GermanyPhysikalisches Institut, Goethe-Universität Frankfurt , Max-von-Laue-Str. 1, 60438 Frankfurt am Main, GermanyPhysikalisches Institut, Goethe-Universität Frankfurt , Max-von-Laue-Str. 1, 60438 Frankfurt am Main, GermanyPhysikalisches Institut, Goethe-Universität Frankfurt , Max-von-Laue-Str. 1, 60438 Frankfurt am Main, GermanyDepartment of Physics, Royal Holloway University of London , Egham, Surrey TW20 0EX, United KingdomDepartment of Physics, Royal Holloway University of London , Egham, Surrey TW20 0EX, United KingdomMax-Planck-Institute for Chemical Physics of Solids , Noethnitzer Str. 40, 01187 Dresden, GermanyThe discovery of superconductivity in the quantum critical Kondo-lattice system YbRh _2 Si _2 at an extremely low temperature of 2 mK has inspired efforts to perform high-resolution electrical resistivity measurements down to this temperature range in highly conductive materials. Here we show that control over the sample geometry by microstructuring using focused-ion-beam techniques allows to reach ultra-low temperatures and increase signal-to-noise ratios (SNRs) tenfold, without adverse effects to sample quality. In five experiments we show four-terminal sensing resistance and magnetoresistance measurements which exhibit sharp phase transitions at the Néel temperature, and Shubnikov–de-Haas (SdH) oscillations between 13 T and 18 T where we identified a new SdH frequency of 0.39 kT. The increased SNR allowed resistance fluctuation (noise) spectroscopy that would not be possible for bulk crystals, and confirmed intrinsic $1/f$ -type fluctuations. Under controlled strain, two thin microstructured samples exhibited a large increase of $T_\mathrm{N}$ from 67 mK up to 188 mK while still showing clear signatures of the phase transition and SdH oscillations. Superconducting quantum interference device-based thermal noise spectroscopy measurements in a nuclear demagnetization refrigerator down to 0.95 mK, show a sharp superconducting transition at $T_\mathrm{c} = 1.2$ mK. These experiments demonstrate microstructuring as a powerful tool to investigate the resistance and the noise spectrum of highly conductive correlated metals over wide temperature ranges.https://doi.org/10.1088/1367-2630/aca8c6strongly correlated electron systemsheavy fermionselectrical and thermal conduction in crystalline metals and alloysfluctuation phenomenarandom processesnoise |
| spellingShingle | Alexander Steppke Sandra Hamann Markus König Andrew P Mackenzie Kristin Kliemt Cornelius Krellner Marvin Kopp Martin Lonsky Jens Müller Lev V Levitin John Saunders Manuel Brando Microstructuring YbRh2Si2 for resistance and noise measurements down to ultra-low temperatures New Journal of Physics strongly correlated electron systems heavy fermions electrical and thermal conduction in crystalline metals and alloys fluctuation phenomena random processes noise |
| title | Microstructuring YbRh2Si2 for resistance and noise measurements down to ultra-low temperatures |
| title_full | Microstructuring YbRh2Si2 for resistance and noise measurements down to ultra-low temperatures |
| title_fullStr | Microstructuring YbRh2Si2 for resistance and noise measurements down to ultra-low temperatures |
| title_full_unstemmed | Microstructuring YbRh2Si2 for resistance and noise measurements down to ultra-low temperatures |
| title_short | Microstructuring YbRh2Si2 for resistance and noise measurements down to ultra-low temperatures |
| title_sort | microstructuring ybrh2si2 for resistance and noise measurements down to ultra low temperatures |
| topic | strongly correlated electron systems heavy fermions electrical and thermal conduction in crystalline metals and alloys fluctuation phenomena random processes noise |
| url | https://doi.org/10.1088/1367-2630/aca8c6 |
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