Speaker
Lakshmi Das
(Physik-Institut, Universität Zürich, Winterthurerstrasse 190, CH-8057 Zürich, Switzerland)
Description
Here, we have studied the magnetically ordered phase of Ca$_{2}$RuO$_4$ at T = 16 K, using Oxygen K edge Resonant Inelastic X-ray Scattering (RIXS) technique. Four excitations have been identified – two low energy excitations labelled A and B at 80 meV and 400 meV respectively and two high energy excitations labelled C and D at 1.3 eV and 2.2 eV respectively. The A and B branches are interpreted to be arising from composite spin-orbital excitations due to spin-orbit coupling and the high-energy excitations, dubbed C and D, arise from singlet-triplet excitations at the Ruthenium site set by energy scale of Hund’s coupling
Authors
Lakshmi Das
(Physik-Institut, Universität Zürich, Winterthurerstrasse 190, CH-8057 Zürich, Switzerland)
F. Forte
(CNR-SPIN, I-84084 Fisciano, Salerno, Italy)
F. Schindler
(Physik-Institut, Universität Zürich, Winterthurerstrasse 190, CH-8057 Zürich, Switzerland)
T. Neupert
(Physik-Institut, Universität Zürich, Winterthurerstrasse 190, CH-8057 Zürich, Switzerland)
J. Chang
(Physik-Institut, Universität Zürich, Winterthurerstrasse 190, CH-8057 Zürich, Switzerland)
O. Ivashko
(Physik-Institut, Universität Zürich, Winterthurerstrasse 190, CH-8057 Zürich, Switzerland)
M. Horio
(Physik-Institut, Universität Zürich, Winterthurerstrasse 190, CH-8057 Zürich, Switzerland)
R. Fittipaldi
(CNR-SPIN, I-84084 Fisciano, Salerno, Italy)
V. Granata
(CNR-SPIN, I-84084 Fisciano, Salerno, Italy)
A. Vecchione
(CNR-SPIN, I-84084 Fisciano, Salerno, Italy)
M. Cuoco
(CNR-SPIN, I-84084 Fisciano, Salerno, Italy)
C.G. Fatuzzo
(Institute of Physics, École Polytechnique Fed´erale de Lausanne (EPFL), CH-1015 Lausanne, Switzerland)
H.M Ronnow
(Institute of Physics, École Polytechnique Fed´erale de Lausanne (EPFL), CH-1015 Lausanne, Switzerland)
M. Dantz
(Swiss Light Source, Paul Scherrer Institut, CH-5232 Villigen PSI, Switzerland)
Y. Tseng
(Swiss Light Source, Paul Scherrer Institut, CH-5232 Villigen PSI, Switzerland)
D.E McNally
(Swiss Light Source, Paul Scherrer Institut, CH-5232 Villigen PSI, Switzerland)
J. Pelliciari
(Swiss Light Source, Paul Scherrer Institut, CH-5232 Villigen PSI, Switzerland)
P.O Velasco
(Swiss Light Source, Paul Scherrer Institut, CH-5232 Villigen PSI, Switzerland)
T. Schmitt
(Swiss Light Source, Paul Scherrer Institut, CH-5232 Villigen PSI, Switzerland)
W. Wan
( Department of Physics, Technical University of Denmark, DK-2800 Kongens Lyngby, Denmark)
N.B Christensen
( Department of Physics, Technical University of Denmark, DK-2800 Kongens Lyngby, Denmark)
N. Kikugawa
(National Institute for Materials Science, 1-2-1 Sengen, Tsukuba, 305-0047 Japan)