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Download or read book Investigation of Unconventional Superconductivity in Infinite-layer Nickelates written by Bai Yang Wang and published by . This book was released on 2022 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: More than one century after the initial discovery of superconductivity in mercury, there remain entire classes of materials whose superconducting mechanisms have yet to be elucidated. One major avenue through which experimentalists contribute in this research has been nding new examples of unconventional superconductors. A recent trend in this material search is to combine traditional material synthesis methods with novel sample manipulation techniques in pursuit of materials in novel geometries. For example, topotactic reduction has demonstrated impressive capabilities to modify oxygen stoichiometry and achieving extreme valence states of 3d transition metal ions in complex oxide systems. In this thesis, I will introduce the in nite-layer nickelates obtained using this method as a new family of 3d-transition-metal-based unconventional superconductors. I will show that this system is a local type-II superconductor with singlet pairing and nodal superconducting gap structure, whose upper critical eld generically violates the Pauli limit and whose super uid density is so low that the superconductivity might be phase coherence limited. I will further identify the importance of rare earth 4f moments in shaping the superconductivity. Overall, I hope to show that this new system presents an additional source of experimental insight into unconventional superconductivity.