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Microstructuring YbRh2Si2 for resistance and noise measurements down to ultra-low temperatures
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dc.contributor.author | Steppke, Alexander | |
dc.contributor.author | Hamann, Sandra | |
dc.contributor.author | König, Markus | |
dc.contributor.author | Mackenzie, Andrew P | |
dc.contributor.author | Kliemt, Kristin | |
dc.contributor.author | Krellner, Cornelius | |
dc.contributor.author | Kopp, Marvin | |
dc.contributor.author | Lonsky, Martin | |
dc.contributor.author | Müller, Jens | |
dc.contributor.author | Levitin, Lev V | |
dc.contributor.author | Saunders, John | |
dc.contributor.author | Brando, Manuel | |
dc.date.accessioned | 2023-01-20T15:30:05Z | |
dc.date.available | 2023-01-20T15:30:05Z | |
dc.date.issued | 2022-12-29 | |
dc.identifier | 283032398 | |
dc.identifier | 4eb9c1f0-b6b3-4a04-90e7-542e16cf4ab9 | |
dc.identifier | 85145651153 | |
dc.identifier | 000905797700001 | |
dc.identifier.citation | Steppke , A , Hamann , S , König , M , Mackenzie , A P , Kliemt , K , Krellner , C , Kopp , M , Lonsky , M , Müller , J , Levitin , L V , Saunders , J & Brando , M 2022 , ' Microstructuring YbRh 2 Si 2 for resistance and noise measurements down to ultra-low temperatures ' , New Journal of Physics , vol. 24 , no. 12 , 123033 . https://doi.org/10.1088/1367-2630/aca8c6 | en |
dc.identifier.issn | 1367-2630 | |
dc.identifier.other | Jisc: 816015 | |
dc.identifier.other | publisher-id: njpaca8c6 | |
dc.identifier.other | manuscript: aca8c6 | |
dc.identifier.other | other: njp-115413.r1 | |
dc.identifier.uri | https://hdl.handle.net/10023/26797 | |
dc.description | Funding: We acknowledge funding by the German Research Foundation (DFG) via the TRR 288 (422213477, project A03, A10 and B02) and projects KR3831/4-1 and BR 4110/1-1. This work was supported by the EU H2020 European Microkelvin Platform EMP, Grant No. 824109. | en |
dc.description.abstract | The discovery of superconductivity in the quantum critical Kondo-lattice system YbRh2Si2 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 TN 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 Tc=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. | |
dc.format.extent | 14 | |
dc.format.extent | 2524279 | |
dc.language.iso | eng | |
dc.relation.ispartof | New Journal of Physics | en |
dc.subject | Strongly correlated electron systems | en |
dc.subject | Heavy fermions | en |
dc.subject | Electrical and thermal conduction in crystalline metals and alloys | en |
dc.subject | Fluctuation phenomena | en |
dc.subject | Random processes | en |
dc.subject | Noise | en |
dc.subject | Brownian motion | en |
dc.subject | QC Physics | en |
dc.subject | QD Chemistry | en |
dc.subject | NDAS | en |
dc.subject | MCC | en |
dc.subject.lcc | QC | en |
dc.subject.lcc | QD | en |
dc.title | Microstructuring YbRh2Si2 for resistance and noise measurements down to ultra-low temperatures | en |
dc.type | Journal article | en |
dc.contributor.institution | University of St Andrews. School of Physics and Astronomy | en |
dc.contributor.institution | University of St Andrews. Condensed Matter Physics | en |
dc.identifier.doi | 10.1088/1367-2630/aca8c6 | |
dc.description.status | Peer reviewed | en |
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