# Magnetic anisotropy and orbital ordering in Ca2RuO4

@article{Porter2018MagneticAA, title={Magnetic anisotropy and orbital ordering in Ca2RuO4}, 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}, year={2018} }

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…

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## References

SHOWING 1-10 OF 44 REFERENCES

Magnon dispersion in Ca2Ru1−xTixO4: Impact of spin-orbit coupling and oxygen moments

- Physics
- 2017

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

- Physics
- 2017

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.

- Materials Science, MedicinePhysical review letters
- 2005

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

- Materials Science
- 1998

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

- Physics
- 2010

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

- Physics
- 2001

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

- Materials Science
- 2002

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

- Physics, Materials SciencePhysical Review B
- 2018

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.

- Physics, MedicinePhysical review letters
- 2015

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

- Physics
- 2011

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…