Ultrasound propagation in the heavy-fermion superconductors URu2Si2 and CeCu2Si2

Wolf, B.; Thalmeier, Peter; Bruls, G.; Sixl, W.; Finsterbusch, D.; Lüthi, B.

doi:10.1016/0921-4526(94)91771-x

Cited by 2 publications

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“…Note that while some resonances experience a step-like discontinuity or "jump" at T HO , others do not. This jump is present in the elastic moduli for all secondorder phase transitions [3][4][5] , but has never before been observed in URu 2 Si 2 due to insufficient experimental resolution [26][27][28][29][30] . Traditional RUS produces spectra at each temperature, such as the one shown in Figure 1b, by sweeping the entire frequency range using a lock-in amplifier.…”

Section: Introductionmentioning

confidence: 99%

One-component order parameter in URu ₂ Si ₂ uncovered by resonant ultrasound spectroscopy and machine learning

et al. 2020

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† Authors contributed equally to this work.URu2Si2 exhibits a clear phase transition at THO = 17.5 K to a low-temperature phase known as "hidden order" (HO). Even the most basic information needed to construct a theory of this state-such as the number of components in the order parameter-has been lacking. Here we use resonant ultrasound spectroscopy (RUS) and machine learning to determine that the order parameter of HO is one-dimensional (singlet), ruling out a large class of theories based on twodimensional (doublet) order parameters. This strict constraint is independent of any microscopic mechanism, and independent of other symmetries that HO may break. Our technique is general for second-order phase transitions, and can discriminate between nematic (singlet) versus loop current (doublet) order in the high-Tc cuprates, and conventional (singlet) versus the proposed px + ipy (doublet) superconductivity in Sr2RuO4. The machine learning framework we develop should be readily adaptable to other spectroscopic techniques where missing resonances confound traditional analysis, such as NMR.

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Section: Introductionmentioning

confidence: 99%

One-component order parameter in URu ₂ Si ₂ uncovered by resonant ultrasound spectroscopy and machine learning

et al. 2020

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Gestalttheoretische Entsendungserfolgsanalyse: Konzeption und Operationalisierung

Hein¹

1999

Internationaler Einsatz Von Führungskräften

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Ultrasound propagation in the heavy-fermion superconductors URu2Si2 and CeCu2Si2

Cited by 2 publications

References 7 publications

One-component order parameter in URu ₂ Si ₂ uncovered by resonant ultrasound spectroscopy and machine learning

One-component order parameter in URu ₂ Si ₂ uncovered by resonant ultrasound spectroscopy and machine learning

Gestalttheoretische Entsendungserfolgsanalyse: Konzeption und Operationalisierung

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Ultrasound propagation in the heavy-fermion superconductors URu2Si2 and CeCu2Si2

Cited by 2 publications

References 7 publications

One-component order parameter in URu 2 Si 2 uncovered by resonant ultrasound spectroscopy and machine learning

One-component order parameter in URu 2 Si 2 uncovered by resonant ultrasound spectroscopy and machine learning

Gestalttheoretische Entsendungserfolgsanalyse: Konzeption und Operationalisierung

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One-component order parameter in URu ₂ Si ₂ uncovered by resonant ultrasound spectroscopy and machine learning

One-component order parameter in URu ₂ Si ₂ uncovered by resonant ultrasound spectroscopy and machine learning