Discovery and Control of Quantum States in 4d/5d Transition Metal Materials

Graduate Thesis Or Dissertation

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Citeable URL: https://scholar.colorado.edu/concern/graduate_thesis_or_dissertations/p5547s94b

Abstract

The burgeoning field of strongly spin-orbit-coupled, correlated 4d/5d transition metal materials concerns systems beyond the traditional Mott insulators and topological materials. The delicate interplay among spin-orbit interaction, on-site Coulomb interactions, Hund’s energy, crystal field splitting, and p-d orbital hybridization offers a fertile ground for the discovery of emergent quantum states that is also extremely susceptible to small external stimuli. In this thesis, we discuss our recent efforts in two parts:

The first part of this thesis is devoted to the discovery of emergent phenomena in newly synthesized materials, such as a unique Kitaev quantum liquids candidate with undistorted honeycomb lattices, and a new type of frustration mechanism that involves Ir₃O₁₂ trimer lattice.

The second part of the thesis focuses on the development of innovative approaches to control the highly susceptible ground state in the 4d/5d transition metal materials, such as by a combination of hydrostatic pressure and anisotropic magnetostriction in Ca₃Ru₂O₇, the application of electric current in a model system of Ca₂RuO₄, and magnetosynthesis in a three 4d/5d model systems.

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