Signature of Magnetic Ordering in Superconducting Nickelates

Since the discovery of unconventional superconductivity almost four decades ago, the mechanism behind Cooper pair formation remains unknown. This work explores unconventional superconductivity in nickelates, drawing parallels with well-known cuprate superconductors. I outline the complex phase diagram of cuprates and the essential components for their superconductivity, including layered structures, specific orbital configurations, and antiferromagnetic interactions. The synthesis and superconducting properties of infinite-layer nickelates achieved through techniques like pulse laser deposition and topotactic reduction are highlighted. A key focus is the anisotropic magnetoresistance (AMR) observed in nickelates compared to cuprates, revealing intriguing magnetic behaviors and AMR rotation at low temperatures. These findings suggest similar magnetic behavior to the electron-doped cuprates.