Emergent weak antilocalization and wide-temperature-range electronic phase diagram in epitaxial RuO 2 thin film

作者：Jin Liu, Lei Gao, Yu Ting Zou, Ting Lin, Mingtong Zhu, Xiang Yu Lyu, Chao Lü, Yu Qian Wang, Ai Ling Ji, Qing Zhang, Zhi Gang Cheng, Lin Gu, Ze Xian Cao, Nian Peng Lu · 发表于：Journal of Physics Condensed Matter · 年份：2023 · DOI：10.1088/1361-648x/ace2a5 · 被引用次数：5 · 研究领域：Advanced Condensed Matter Physics、Electronic and Structural Properties of Oxides、Magnetic properties of thin films

Abstract Binary ruthenium dioxide (RuO 2 ) has gradually attracted much attention in condensed matter physics and material sciences due to its various intriguing physical properties, such as strain-induced superconductivity, anomalous Hall effect, collinear anti-ferromagnetism, etc. However, its complex emergent electronic states and the corresponding phase diagram over a wide temperature range remain unexplored, which is critically important to understanding the underlying physics and exploring its final physical properties and functionalities. Here, through optimizing the growth conditions by using versatile pulsed laser deposition, high-quality epitaxial RuO 2 thin films with clear lattice structure are obtained, upon which the electronic transport is investigated, and emergent electronic states and the relevant physical properties are unveiled. Firstly, at a high-temperature range, it is the Bloch–Grüneisen state, instead of the common Fermi liquid metallic state, that dominates the electrical transport behavior. Moreover, the recently reported anomalous Hall effect is also revealed, which confirms the presence of the Berry phase in the energy band structure. More excitingly, we find that above the superconductivity transition temperature, a new positive magnetic resistance quantum coherent state with an unusual dip as well as an angel-dependent critical magnetic field emerges, which can be attributed to the weak antilocalization effect. Lastly, the complex phase diagram ...