Magnetic anisotropy and orbital ordering in Ca2RuO4

  title={Magnetic anisotropy and orbital ordering in 
  author={D. G. Porter and Veronica Granata and Filomena Forte and Sergio Di Matteo and Mario Cuoco and Rosalba Fittipaldi and Antonio Vecchione and Alessandro Bombardi},
  journal={Physical Review B},
We review the magnetic and orbital ordered states in \cro{} by performing Resonant Elastic X-ray Scattering (REXS) at the Ru L$_{2,3}$-edges. In principle, the point symmetry at Ru sites does not constrain the direction of the magnetic moment below $T_N$. However early measurements reported the ordered moment entirely along the $\vec{b}$ orthorhombic axis. Taking advantage of the large resonant enhancement of the magnetic scattering close to the Ru L$_2$ and L$_3$ absorption edges, we monitored… 
Suppression of the orbital magnetic moment driven by electronic correlations in Sr4Ru3O10
The coupling of spin and orbital degrees of freedom in the trilayer ${\mathrm{Sr}}_{4}{\mathrm{Ru}}_{3}{\mathrm{O}}_{10}$ sets a long-standing puzzle due to the peculiar anisotropic coexistence of
Higgs mode and stability of xy -orbital ordering in Ca2RuO4
We investigate the stability of $xy$ orbital ordering and the nature of the magnetic longitudinal excitations in ${\mathrm{Ca}}_{2}{\mathrm{RuO}}_{4}$. To this end, we employ the local-density
Tuning of the Ru4+ ground-state orbital population in the 4d4 Mott insulator Ca2RuO4 achieved by La doping
The ground-state orbital occupancy of the Ru$^{4+}$ ion in Ca$_{2-x}$La$_x$RuO$_4$ [x=0, 0.05(1), 0.07(1) and 0.12(1)] was investigated by performing X-ray absorption spectroscopy (XAS) in the
Ab initio study of pressure-induced structural and electronic phase transitions in Ca2RuO4
${\mathrm{Ca}}_{2}\mathrm{Ru}{\mathrm{O}}_{4}$ is a compound with a Mott insulating ground state, which responds to external pressure in a variety of ways, some of which are expected (an
Competition of three-dimensional magnetic phases in Ca2Ru1−xFexO4 : A structural perspective
The crystalline and magnetic structures of ${\mathrm{Ca}}_{2}{\mathrm{Ru}}_{1\ensuremath{-}x}{\mathrm{Fe}}_{x}{\mathrm{O}}_{4}$ ($x=0.02$, 0.05, 0.08, and 0.12) have been studied using neutron and
Abnormal phase flip in the coherent phonon oscillations of Ca2RuO4
We employ an optical pump-probe technique to study coherent phonon oscillations in Ca$_2$RuO$_4$. We find that oscillation-amplitude of an $A_g$ symmetric phonon mode is strongly suppressed at 260 K,
Emergence of a metallic metastable phase induced by electrical current in Ca2RuO4
A comprehensive study of the behavior of the Mott insulator ${\mathrm{Ca}}_{2}{\mathrm{RuO}}_{4}$ under electrical current drive is performed by combining two experimental probes: the macroscopic
Tuning nodal line semimetals in trilayered systems
We investigate two-dimensional trilayered quantum systems with multi-orbital conduction bands by focusing on the role played by the layer degree of freedom in setting the character of nodal line
Suppression of effective spin-orbit coupling by thermal fluctuations in spin-orbit coupled antiferromagnets
We apply the finite-temperature variational cluster approach to a strongly correlated and spinorbit coupled model for four electrons (i.e. two holes) in the t2g subshell. We focus on parameters
Multiple band crossings and Fermi surface topology: Role of double nonsymmorphic symmetries in MnP-type crystal structures
We use relativistic ab-initio methods combined with model Hamiltonian approaches to analyze the normal-phase electronic and structural properties of the recently discovered WP superconductor.


Magnon dispersion in Ca2Ru1−xTixO4: Impact of spin-orbit coupling and oxygen moments
The magnon dispersion of Ca$_2$RuO$_4$ has been studied by polarized and unpolarized neutron scattering experiments on crystals containing 0, 1 and 10 % of Ti. The entire dispersion of transverse
Mott transition, spin-orbit effects, and magnetism in Ca 2 RuO 4
In this work, we study the effects of spin-orbit and Coulomb anisotropy on the electronic and magnetic properties of the Mott insulator ${\mathrm{Ca}}_{2}{\mathrm{RuO}}_{4}$. We use the local-density
Orbital ordering transition in Ca2RuO4 observed with resonant X-ray diffraction.
Besides the previously known antiferromagnetic phase transition at T(N)=110 K, an additional phase transition, between two paramagnetic phases, is observed around 260 K and can be attributed to orbital ordering of the Ru t(2g) electrons.
Crystal and magnetic structure of Ca 2 RuO 4 : Magnetoelastic coupling and the metal-insulator transition
The crystal and magnetic structure of ${\mathrm{Ca}}_{2}{\mathrm{RuO}}_{4}$ (CRO) has been studied by powder neutron diffraction. CRO was synthesized in two different modifications (stoichiometric
Field-induced orbital patterns in ferromagnetic layered ruthenates
We study the evolution of orbital patterns in ferromagnetic layered ruthenates due to the competition of Coulomb interactions, compressive c axis and orthorhombic distortions in the presence of a
Spin-Orbit Coupling in the Mott Insulator Ca2RuO4
O 1s x-ray absorption study of the Mott insulator Ca{sub 2}RuO {sub 4} shows that the orbital population of the 4d t{sub 2g} band dramatically changes with temperature. In addition, spin-resolved
Orbital-selective Mott-insulator transition in Ca2 - xSrxRuO4
Abstract:The electronic structures of the metallic and insulating phases of the alloy series Ca2-xSrxRuO4 (0 ≤x ≤ 2) are calculated using LDA, LDA+U and Dynamical Mean-Field Approximation methods. In
Persistence of antiferromagnetic order upon La substitution in the 4d4 Mott insulator Ca2RuO4
The chemical and magnetic structures of the series of compounds Ca2−xLaxRuO4 [x = 0, 0.05(1), 0.07(1), 0.12(1)] have been investigated using neutron diffraction and resonant elastic x-ray scattering.
Highly Anisotropic Magnon Dispersion in Ca_{2}RuO_{4}: Evidence for Strong Spin Orbit Coupling.
Orbital ordering breaking tetragonal symmetry, and strong spin-orbit coupling can thus be identified as important factors in this system.
Spin-orbit coupling induced Mott transition in Ca$_{2-x}$Sr$_{x}$RuO$_{4}$ (0
We propose a new mechanism for the paramagnetic metal-insulator transition in the layered perovskite Ca$_{2-x}$Sr$_{x}$RuO$_{4}$ (0<x<0.2). The LDA+U approach including spin-orbit coupling is used to