A $$\hbox {j}_{\mathrm{eff}} = 1/2$$ j eff =
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A jeff = 1/2 pseudospinon continuum in CaIrO3 Matteo Rossi1,2,8,a , Pietro Marabotti2 , Yasuyuki Hirata3,9 , Giulio Monaco4 , Michael Krisch1, Kenya Ohgushi3,10 , Krzysztof Wohlfeld5 , Jeroen van den Brink6,7 , Marco Moretti Sala1,2,b 1 2 3 4 5 6 7 8 9 10
ESRF – The European Synchrotron, 71 Avenue des Martyrs, CS 40220, 38043 Grenoble, France Dipartimento di Fisica, Politecnico di Milano, Piazza Leonardo da Vinci 32, 20133 Milan, Italy Institute for Solid State Physics, The University of Tokyo, Kashiwa, Chiba 277-8581, Japan Dipartimento di Fisica, Università di Trento, Via Sommarive 14, 38123 Povo, TN, Italy Institute of Theoretical Physics, Faculty of Physics, University of Warsaw, Pasteura 5, 02093 Warsaw, Poland Institute for Theoretical Solid State Physics, IFW Dresden, Helmholtzstrasse 20, 01069 Dresden, Germany Department of Physics, Technical University Dresden, 01062 Dresden, Germany Present Address Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, CA 94025, USA Present Address Department of Applied Physics, National Defense Academy of Japan, 1-10-20 Hashirimizu, Yokosuka, Kanagawa 239–8686, Japan Present Address Department of Physics, Tohoku University, 6-3 Aramaki-Aoba, Aoba-ku, Sendai, Miyagi 980-8578, Japan
Received: 11 June 2020 / Accepted: 29 July 2020 © Società Italiana di Fisica and Springer-Verlag GmbH Germany, part of Springer Nature 2020
Abstract In so-called jeff = 1/2 systems, including some iridates and ruthenates, the coherent superposition of t2g orbitals in the ground state gives rise to hopping processes that strongly depend on the bond geometry. Resonant inelastic X-ray scattering measurements on CaIrO3 reveal a prototypical jeff = 1/2 pseudospinon continuum, a hallmark of one-dimensional (1D) magnetic systems despite its three-dimensional crystal structure. The experimental spectra compare very well to the calculated magnetic dynamical structure factor of weakly coupled spin-1/2 chains. We attribute the onset of such quasi-1D magnetism to the fundamental difference in the magnetic interactions between the jeff = 1/2 pseudospins along the corner- and edge-sharing bonds in CaIrO3 .
1 Introduction Spin-orbit-induced Mott insulators, including iridium oxides (iridates) and RuCl3 , host a large variety of physical properties, whose microscopic origin is intrinsic to the nature of the jeff = 1/2 ground state and of the interactions it gives rise to [1–4]. Electronic interactions in insulating systems originate from virtual hopping processes, possibly through the ligands and, depending on the bond geometry, multiple hopping paths may exist. This possibility is enhanced in iridates, where the jeff = 1/2 electronic wave function arises from a coherent superposition of all t2g orbitals with mixed phases and spin components. As a consequence,
a e-mail: [email protected] (corresponding author) b e-mail: [email protected]
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Eur. Phys. J. Plus
(2020) 135:676
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