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We report on a new technique for measuring the dynamic Young’s modulus, E, of quantum materials at low temperatures as a function of static tuning strain, e, in piezoactuator-driven pressure cells. In addition to a static tuning of stress and strain, we apply a small-amplitude, finite-frequency a.c. (1 Hz < omega < 1000 Hz) uniaxial stress, σac, to the sample and measure the resulting a.c. strain, εac, using a capacitive sensor to obtain the associated modulus E. We demonstrate the performance of the new technique through proof-of-principle experiments on the unconventional superconductor Sr2RuO4, which is known for its rich temperature-strain phase diagram. In particular, we show that the magnitude of E, measured using this a.c. technique at low frequencies, exhibits a pronounced nonlinear elasticity, which is in very good agreement with previous Young’s modulus measurements on Sr2RuO4 under [100] strain using a d.c. method (Noad et al., Science 382, 447-450 (2023)). By combining the new a.c. Young’s modulus measurements with a.c. elastocaloric measurements in a single measurement, we demonstrate that these a.c. techniques are powerful in detecting small anomalies in the elastic properties of quantum materials. Finally, using the case of Sr2RuO4 as an example, we demonstrate how the imaginary component of the modulus can provide additional information about the nature of ordered phases.

権利情報:

• Creative Commons BY Attribution 4.0 International
  

キーワード: Crystal lattices, Elastic modulus, Fermi surface, Phase transitions, Stress strain relations, Piezoelectric devices, Viscoelasticity

刊行年月日: 2024-07-01

出版者: AIP Publishing

掲載誌:

• Review of Scientific Instruments (ISSN: 00346748) vol. 95 issue. 7

研究助成金:

• Max-Planck-Gesellschaft
• Deutsche Forschungsgemeinschaft TRR 288-422213477
• Deutsche Forschungsgemeinschaft SFB 1143-247310070
• Deutsche Forschungsgemeinschaft EXC 2147-390858490
• Japan Society for the Promotion of Science JSPS KAKENHI JP18K04715
• Japan Society for the Promotion of Science JP21H01033
• Japan Society for the Promotion of Science JP22K19093

原稿種別: 出版者版 (Version of record)

MDR DOI:

公開URL: https://doi.org/10.1063/5.0210777

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更新時刻: 2024-07-25 16:09:46 +0900

MDRでの公開時刻: 2024-07-25 16:30:24 +0900