Exploring novel states in Ca₃Ru₂O₇under pressure and strain.

Ca₃Ru₂O₇ has been considered a material with a rich playground due to its great variety of phenomenology, displaying interesting low temperature properties such as spin-valve and giant magnetoresistance effects. It displays unconventional magnetic order and electronic transitions without changes in crystal symmetry [1]. Experimental works have suggested the emergency of novel properties under external manipulation, although still barely understood. Here, we explore the electronic properties of Ca₃Ru₂O₇ under pressure and strain using density functional theory (DFT). On the one hand, our studies suggest that several phase transitions can emerge from the interplay among magnetism, spin-orbit coupling, and Coulomb repulsion, and on the other hand, these studies help to the understanding of fundamental issues in the ground state, such as the role between the spin-orbit coupling and the lattice grades of freedom.

References
1- I. Markovic, M. D. Watson, O. J. Clark, F. Mazzola, E. A. Morales, C. A. Hooley, H. Rosner, C. M. Polley, T. Balasubramanian, S. Mukherjee, N. Kikugawa, D. A. Sokolov, A. P. Mackenzie, and P. D. C. King, PNAS 117, 15524 (2020).