Fully filling-controlled pyrochlore ruthenates: emergent ferromagnetic-metal state and geometrical Hall effect

Abstract

Carrier doping to the Mott insulator is essential to produce highly correlated metals with emergent properties. Pyrochlore ruthenates, Pr${}_2$Ru${}_2$O${}_7$ (Ru-$4d$ electron number, $n=4$) and Ca${}_2$Ru${}_2$O${}_7$ ($n=3$), are a Mott insulator and a magnetic bad metal, respectively, due to the strong electron correlation. We investigate magneto-transport properties of (Pr${}_{1-x}$Ca${}_x$)${}_2$Ru${}_2$O${}_7$ in a whole band-filling range, $0<x<1$. With increasing hole-doping $x$, the system undergoes an insulator-metal transition. When Ca${}_2$Ru${}_2$O${}_7$ is doped with electrons ($0.5<x<0.9$), the enhanced coupling among Ru-$4d$ spins produces a ferromagnetic-metal phase with a large anomalous-Hall angle up to 2 %. We discuss the electronic phase transitions in (Pr${}_{1-x}$Ca${}_x$)${}_2$Ru${}_2$O${}_7$ in view of Hund's metal.

arXiv comment6 pages, 4 figures

References in corpus (31)

• Advanced capabilities for materials modelling with Quantum ESPRESSO
• Maximally-localized generalized Wannier functions for composite energy bands
• Anomalous Hall effect
• Optimized norm-conserving Vanderbilt pseudopotentials
• Maximally-localized Wannier functions for entangled energy bands
• The PseudoDojo: Training and grading a 85 element optimized norm-conserving pseudopotential table
• Magnetic Pyrochlore Oxides
• Correlated quantum phenomena in the strong spin-orbit regime
• Anomalous Hall Effect and Magnetic Monopoles in Momentum-Space
• Strong electronic correlations from Hund's coupling
• Frequency-dependent local interactions and low-energy effective models from electronic structure calculations
• Skyrmion lattice with a giant topological Hall effect in a frustrated triangular-lattice magnet
• Unusual Hall Effect Anomaly in MnSi Under Pressure
• Janus-faced influence of the Hund's rule coupling in strongly correlated materials
• Effective Coulomb interaction in transition metals from constrained random-phase approximation
• Spin freezing transition and non-Fermi-liquid self-energy in a 3-orbital model
• Anomalous Hall effect in Weyl semimetal half Heusler compounds RPtBi (R = Gd and Nd)
• Quadratic Fermi Node in a 3D Strongly Correlated Semimetal
• Spin chirality fluctuation in two-dimensional ferromagnets with perpendicular anisotropy
• RESPACK: An ab initio tool for derivation of effective low-energy model of material
• Electronic correlations, magnetism and Hund's rule coupling in the ruthenium perovskites SrRuO${}_3$ and CaRuO${}_3$
• Spin-Orbit Coupling and Electronic Correlations in Sr2RuO4
• Phase diagram of pyrochlore iridates: all-in-all-out magnetic ordering and non-Fermi liquid properties
• Signatures of Mottness and Hundness in archetypal correlated metals
• A Novel Pyrochlore Ruthenate: Ca2Ru2O7
• Nonlocal correlations induced by Hund's coupling: a cluster DMFT study
• Ferromagnetism and correlation strength in cubic barium ruthenate in comparison to strontium and calcium ruthenate: a dynamical mean field study
• Itinerant ferromagnetism in the multiorbital Hubbard model: a dynamical mean-field study
• Studies of the Anomalous Hall Effect and Magnetic Structure of Nd2Mo2O7 -Test of the Chirality Mechanism-
• Neutron Scattering Studies of Pyrochlore Compound Nd2Mo2O7 in Magnetic Field
• Low temperature magnetic properties of Nd2Ru2O7

Cited by in corpus (3)

• Magnetic structures and electronic properties of cubic-pyrochlore ruthenates from first principles
• Metal-insulator transitions in pyrochlore oxides
• Geometrical frustration and incommensurate magnetic order in Na${}_3$RuO${}_4$ with two triangular motifs