Spin fluctuations sufficient to mediate superconductivity in nickelates

• Authors: WORM Paul; WANG Qisi; KITATANI Motoharu; BIALO Izabela; GAO Qiang; REN Xiaolin; CHOI Jaewon; CSONTOSOVÁ Diana; ZHOU Ke-Jin; ZHOU Xingjiang; ZHU Zhihai; SI Liang; CHANG Johan; TOMCZAK Jan M; HELD Karsten
• Year of publication: 2024
• Type: Article in Periodical
• Magazine / Source: Physical Review B
• MU Faculty or unit: Faculty of Science
• web: https://doi.org/10.1103/PhysRevB.109.235126
• Doi: https://doi.org/10.1103/PhysRevB.109.235126
• Keywords: HIGH-TEMPERATURE SUPERCONDUCTIVITY; HIGH-TC SUPERCONDUCTIVITY; ELECTRONIC-STRUCTURE; TRANSITION; INSULATOR; DYNAMICS; WAVES
• Description: Infinite-layer nickelates show high-temperature superconductivity, and the experimental phase diagram agrees well with the one simulated within the dynamical vertex approximation (D Gamma A). Here, we compare the spinfluctuation spectrum behind these calculations to resonant inelastic x-ray scattering experiments. The overall agreement is good. This independent cross validation of the strength of spin fluctuations strongly supports the scenario, advanced by D Gamma A, that spin fluctuations are the mediator of the superconductivity observed in nickelates.