Ultrasound evidence for a two-component superconducting order parameter in Sr$_2$RuO$_4$
| Autor: | Maxime Dion, Indranil Paul, Christian Lupien, Louis Taillefer, C. Proust, A. Zitouni, L. Berges, A. Georges, S. Benhabib, Zhiqiang Mao, Y. Maeno, M. Nardone |
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| Přispěvatelé: | Laboratoire national des champs magnétiques intenses - Toulouse (LNCMI-T), Institut National des Sciences Appliquées - Toulouse (INSA Toulouse), Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes (UGA), Institut Quantique [Sherbrooke] (UdeS), Université de Sherbrooke (UdeS), Laboratoire Matériaux et Phénomènes Quantiques (MPQ (UMR_7162)), Centre National de la Recherche Scientifique (CNRS)-Université de Paris (UP), Centre de Physique Théorique [Palaiseau] (CPHT), Centre National de la Recherche Scientifique (CNRS)-École polytechnique (X), Chaire Physique de la matière condensée (A. Georges), Collège de France (CdF (institution)), Institut National des Sciences Appliquées (INSA)-Université de Toulouse (UT)-Institut National des Sciences Appliquées (INSA)-Université de Toulouse (UT)-Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes (UGA), Centre National de la Recherche Scientifique (CNRS)-Université Paris Cité (UPCité), École polytechnique (X)-Centre National de la Recherche Scientifique (CNRS), Collège de France - Chaire Physique de la matière condensée (A. Georges), ANR-19-CE30-0019,neptun,Nouvelles approches du problème des supraconducteurs à haute température(2019) |
| Rok vydání: | 2020 |
| Předmět: |
Superconductivity
Physics Condensed matter physics Strongly Correlated Electrons (cond-mat.str-el) Component (thermodynamics) Condensed Matter - Superconductivity General Physics and Astronomy Order (ring theory) FOS: Physical sciences State (functional analysis) 01 natural sciences Symmetry (physics) 010305 fluids & plasmas [PHYS.COND.CM-S]Physics [physics]/Condensed Matter [cond-mat]/Superconductivity [cond-mat.supr-con] Superconductivity (cond-mat.supr-con) Condensed Matter - Strongly Correlated Electrons Pairing Condensed Matter::Superconductivity 0103 physical sciences [PHYS.COND]Physics [physics]/Condensed Matter [cond-mat] Cooper pair 010306 general physics Constant (mathematics) ComputingMilieux_MISCELLANEOUS |
| Zdroj: | Nature Physics Nature Physics, Nature Publishing Group, 2021, ⟨10.1038/s41567-020-1033-3⟩ Nature Physics, Nature Publishing Group, 2020, ⟨10.1038/s41567-020-1033-3⟩ Nature Physics, 2021, ⟨10.1038/s41567-020-1033-3⟩ |
| ISSN: | 1745-2473 1476-4636 |
| DOI: | 10.48550/arxiv.2002.05916 |
| Popis: | The quasi-2D metal Sr$_2$RuO$_4$ is one of the best characterized unconventional superconductors, yet the nature of its superconducting order parameter is still highly debated. This information is crucial to determine the pairing mechanism of Cooper pairs. Here we use ultrasound velocity to probe the superconducting state of Sr$_2$RuO$_4$. This thermodynamic probe is symmetry-sensitive and can help to identify the superconducting order symmetry. Indeed, we observe a sharp jump in the shear elastic constant $c_{66}$ as the temperature is raised across the superconducting transition at $T_c$. This directly implies that the superconducting order parameter is of a two-component nature. Based on symmetry argument and given the other known properties of Sr$_2$RuO$_4$, we discuss what states are compatible with this requirement and propose that the two-component order parameter, namely $\lbrace d_{xz}; d_{yz} \rbrace$, is the most likely candidate. |
| Databáze: | OpenAIRE |
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