Nematic-Fluctuation-Mediated Superconductivity Revealed by Anisotropic Strain in Ba ( Fe 1 − x Co x ) 2 As 2
Anisotropic strain is an external field capable of selectively addressing the role of nematic fluctuations in promoting superconductivity. We demonstrate this using polarization-resolved elasto-Raman scattering to probe the evolution of nematic fluctuations under strain in the normal and superconduc...
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| Veröffentlicht in: | Physical review letters 2022-10, Vol.129 (18), Article 187002 |
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| container_title | Physical review letters |
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| creator | Philippe, Jean-Côme Lespinas, Alexis Faria, Jimmy Forget, Anne Colson, Dorothée Houver, Sarah Cazayous, Maximilien Sacuto, Alain Paul, Indranil Gallais, Yann |
| description | Anisotropic strain is an external field capable of selectively addressing the role of nematic fluctuations in promoting superconductivity. We demonstrate this using polarization-resolved elasto-Raman scattering to probe the evolution of nematic fluctuations under strain in the normal and superconducting states of the paradigmatic iron-based superconductor Ba(Fe1−x1−x_{1-x}Coxx_x)22_2As22_2. In the non-superconducting parent compound BaFe22_2As22_2 we observe a strain-induced suppression of the nematic susceptibility which follows the expected behavior of an Ising order parameter under a symmetry breaking field. For the superconducting compound, the suppression of the nematic susceptibility correlates with the decrease of the superconducting critical temperature TcTcT_c. Our results indicate a significant contribution of nematic fluctuations to electron pairing and validate theoretical scenarios of enhanced TcTcT_c near a nematic quantum critical point. |
| doi_str_mv | 10.1103/PhysRevLett.129.187002 |
| format | Article |
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We demonstrate this using polarization-resolved elasto-Raman scattering to probe the evolution of nematic fluctuations under strain in the normal and superconducting states of the paradigmatic iron-based superconductor Ba(Fe1−x1−x_{1-x}Coxx_x)22_2As22_2. In the non-superconducting parent compound BaFe22_2As22_2 we observe a strain-induced suppression of the nematic susceptibility which follows the expected behavior of an Ising order parameter under a symmetry breaking field. For the superconducting compound, the suppression of the nematic susceptibility correlates with the decrease of the superconducting critical temperature TcTcT_c. 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We demonstrate this using polarization-resolved elasto-Raman scattering to probe the evolution of nematic fluctuations under strain in the normal and superconducting states of the paradigmatic iron-based superconductor Ba(Fe1−x1−x_{1-x}Coxx_x)22_2As22_2. In the non-superconducting parent compound BaFe22_2As22_2 we observe a strain-induced suppression of the nematic susceptibility which follows the expected behavior of an Ising order parameter under a symmetry breaking field. For the superconducting compound, the suppression of the nematic susceptibility correlates with the decrease of the superconducting critical temperature TcTcT_c. 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| title | Nematic-Fluctuation-Mediated Superconductivity Revealed by Anisotropic Strain in Ba ( Fe 1 − x Co x ) 2 As 2 |
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