Unconventional metamagnetic electron states in orbital band systems

Abstract

We extend the study of the Fermi surface instability of the Pomeranchuk type into systems with orbital band structures, which are common features in transition metal oxides. Band hybridization significantly shifts the spectra weight of the Landau interactions from the conventional s-wave channel to unconventional non-s-wave channels, which results in anisotropic (nematic) Fermi surface distortions even with ordinary interactions in solids. The Ginzburg-Landau free energy is constructed by coupling the charge-nematic, spin-nematic and ferromagnetic order parameters together, which shows that nematic electron states can be induced by metamagnetism. The connection between this mechanism to the anisotropic metamagnetc states observed in Sr${}_3$Ru${}_2$O${}_7$ at high magnetic fields is studied in a multi-band Hubbard model with the hybridized quasi-one dimensional $d_{xz}$ and $d_{yz}$-bands.

6 pages, published version

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• Effect of a staggered spin-orbit coupling on the occurrence of a nematic phase in Sr${}_3$Ru${}_2$O${}_7$
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• Quantum oscillations in the anomalous phase in Sr3Ru2O7
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• Spontaneous fourfold-symmetry breaking driven by electron-lattice coupling and strong correlations in high-$T_c$ cuprates
• Theoretical insights into electronic nematic order, bond-charge orders, and plasmons in cuprate superconductors
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• Atomic-scale imaging of emergent order at a magnetic-field-induced Lifshitz transition
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• Microscopic Theory of the Thermodynamic Properties of Sr${}_3$Ru${}_2$O${}_7$
• Mean-field theory on a coupled system of ferromagnetism and electronic nematic order
• Recent Progress of Point Contact Spectroscopy as a Probe of Correlated Electron States
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• Pressure study of nematicity and quantum criticality in Sr${}_3$Ru${}_2$O${}_7$ for an in-plane field
• Evolution of Interorbital Superconductor to Intraorbital Spin-Density Wave in Layered Ruthenates
• Mn-induced magnetic symmetry breaking and its correlation with the metal-insulator transition in bilayered Sr3(Ru1-xMnx)2O7
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• Unrestricted Hartree-Fock Analysis of Sr${}_{3-x}$Ca${}_x$Ru${}_2$O${}_7$