Detection of multipolar orders in the spin-orbit-entangled 5d Mott insulator Ba2MgReO6

Abstract

In electronic solids with strong spin-orbit interactions (SOIs), the spin and orbital degrees of freedom of an electron are quantum mechanically entangled, which may result in an exotic multipolar order instead of a conventional dipolar order such as a magnetic order. Such a higher-degree order is called "hidden order" because of difficulties in experimental detection. Moreover, the number of candidate compounds is limited, especially rare in d electron systems, in which an interplay between SOIs and Coulomb interactions is expected to cause rich physics. Here, we employ state-of-the-art synchrotron X-ray diffraction techniques on a high-quality single crystal to probe subtle symmetry breaking induced by a multipolar order. We unequivocally demonstrate that the double-perovskite Ba2MgReO6 exhibits successive transitions to quadrupolar and then dipolar orders upon cooling, which is consistent with a theory considering SOIs. Our findings are a significant step towards understanding the intriguing physics of multipoles realized by spin-orbit-entangled 5d electrons.

17 pages main text, 7 pages supplement, to be published in Phys. Rev. Research

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Cited by in corpus (46)

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• Thermal Transport of Fractionalized Antiferromagnetic and Field Induced States in the Kitaev Material Na${}_2$Co${}_2$TeO${}_6$
• Spin-orbit-lattice entangled state in A${}_2$MgReO${}_6$ (A = Ca, Sr, Ba) revealed by resonant inelastic X-ray scattering
• Probing octupolar hidden order via Janus impurities
• Antiferromagnetic long-range order in $5d^1$ double-perovskite Sr${}_2$MgReO${}_6$
• Possible quadrupole order in tetragonal Ba2CdReO6 and chemical trend in the ground states of 5d1 double perovskites
• Vibronic order and emergent magnetism in cubic $d^1$ double perovskites
• Triple-$\mathcal{Q}$ partial magnetic orders induced by quadrupolar interactions: Triforce order scenario for UNi${}_4$B
• Hidden orders in spin-orbit entangled correlated insulators
• Eight-color chiral spin liquid in the $S=1$ bilinear-biquadratic model with Kitaev interactions
• Quadrupole partial orders and triple-$q$ states on the face-centered cubic lattice
• Interplay of superexchange and vibronic effects in the hidden order of Ba${}_2$MgReO${}_6$ from first principles
• Effects of charge doping on Mott insulator with strong spin-orbit coupling, Ba${}_2$NaOsO${}_6$
• Multipolar magnetism in $5d^2$ vacancy-ordered halide double perovskites
• Mean-field Study of Antiferromagnetic and Antiferroquadrupolar Orderings in Tetragonal CeCoSi
• Exploring energy landscapes of charge multipoles using constrained density functional theory
• Structure, heat capacity and Raman spectra of mm-sized Ba${}_2$MgWO${}_6$ single crystals synthesized by BaCl${}_2$-MgCl${}_2$ flux method
• Phonon-driven multipolar dynamics in a spin-orbit coupled Mott insulator
• Multipolar interactions and magnetic excitation gap in d${}^3$ spin-orbit Mott insulators
• Multiple-$q$ dipole-quadrupole instability in spin-1 triangular-lattice systems
• Spin-orbit-entangled electronic structure of Ba${}_2$CaOsO${}_6$ studied by O $K$-edge resonant inelastic X-ray scattering
• Dynamic Jahn-Teller Phenomena in Heavy Transition Metal Compounds
• Dipolar-octupolar correlations and hierarchy of exchange interactions in Ce${}_2$Hf${}_2$O${}_7$
• Experimental and theoretical thermodynamic studies in Ba${}_2$MgReO${}_6$ -- the ground state in the context of Jahn-Teller effect
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• Fate of multipolar physics in $5d^2$ double perovskites
• Persistent quantum vibronic dynamics in a $5d^1$ double perovskite oxide
• Multipolar multiferroics in $4d^2$/$5d^2$ Mott insulators
• Fermi surface and light quasi particles in hourglass nodal chain metal \b{eta}-ReO2
• Chemical Pressure Tuning of Multipolar and Magnetic Orders in Ba${}_2$(Cd${}_{1-x}$Ca${}_x$)ReO${}_6$ Double Perovskites
• Composite quadrupole order in ferroic and multiferroic materials
• Impact of gapped spin-orbit excitons on low energy pseudospin exchange interactions
• Odd-parity multipole order in the spin-orbit coupled metallic pyrochlore Pb${}_2$Re${}_2$O${}_{7-\delta }$
• Possibility of ferro-octupolar order in Ba${}_2$CaOsO${}_6$ assessed by X-ray magnetic dichroism measurements
• Dipolar and quadrupolar correlations in the $5d^2$ Re-based double perovskites Ba${}_2$YReO${}_6$ and Ba${}_2$ScReO${}_6$
• Magnetic ordering in the $J_{\mathrm{eff}}$ = 0 Nickelate NiRh${}_2$O${}_4$ prepared via a solid-state metathesis
• Magnetic behavior of the $5d^1$ Re-based double perovskite Sr${}_2$ZnReO${}_6$
• Coupled-cluster approach to vibronic effects in resonant inelastic x-ray scattering of quantum materials: Application to a $5d^1$ rhenium oxide
• Symmetry Rules on Multipole Interactions under Crystallographic Point Groups and Application to Multiple-$Q$ Multipole States
• Topological Semimetal KAlGe with Novel Electronic Instability
• Novel Magnetoacoustic Resonance Technique for Exploring Hidden Quadrupoles in a Crystal Field Quartet
• Multipolar ferroelectricity in the Mott regime
• Intersite Coulomb repulsion driven quadrupole instability and magnetic ordering in the orbital frustrated Ba${}_2$MgReO${}_6$
• Pseudo-chiral phonon splitting from octupolar magnetic order