Magnetic fluctuations and spin resonance peak in superconducting Nickelates
In 2019, superconductivity has been surprisingly reported at 15 K in Sr-doped NdNiO2 (Nd0.8Sr0.2NiO2), suggesting the existence of a new family of high-temperature superconductors. The structure of this nickel oxide consists in a stacking of NiO2 layers separated by rare-earth spacer layer, stabilizing the unusual Ni1+ oxidation state, corresponding to 3d9 electronic configuration similarly to the cuprates where high-temperature superconductivity is assumed to be due to spin fluctuations. In a collaboration with Alain Demourgues and Baptiste Vignolle at Institut de Chimie de la Matière Condensée de Bordeaux (ICMCB), we are currently synthesizing Sr-doped NdNiO2 polycrystalline powder compounds. We propose to look for magnetic fluctuations and possible spin resonance peak using time-of-flight spectroscopy (IN5) for a sample with a Sr concentration of 20% where superconductivity is expected.
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TAILLEUR Elodie; BALEDENT Victor; BOUNOUA Dalila; Bourges; FAK Bjorn; Hassan-Dahab DAHAB; IVANOV Alexandre; OLLIVIER Jacques and SIDIS Yvan. (2021). Magnetic fluctuations and spin resonance peak in superconducting Nickelates. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.4-02-609
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