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RESEARCH PRODUCT
Exotic Spin-Orbital Physics in Hybrid Oxides
Wojciech BrzezickiMario CuocoAndrzej M. Ole��subject
spin-orbital orderorbital fluctuationsFOS: Physical sciences02 engineering and technologyPolaron01 natural sciencesIonCondensed Matter - Strongly Correlated Electrons0103 physical sciences010306 general physicsSpin (physics)PhysicsCondensed Matter - Materials ScienceStrongly Correlated Electrons (cond-mat.str-el)Condensed matter physicsSpinsMott insulatorDopingMaterials Science (cond-mat.mtrl-sci)Charge (physics)021001 nanoscience & nanotechnologyCondensed Matter Physicsorbital/charge dilutionElectronic Optical and Magnetic MaterialsDoped Mott insulatorSuperexchangeCondensed Matter::Strongly Correlated ElectronsAstrophysics::Earth and Planetary Astrophysics0210 nano-technologydescription
We compare the effective spin-orbital super\-exchange triggered by magnetic $3d$ impurities with $d^3$ and $d^2$ configurations and either no orbital degree of freedom (orbital dilution) or hole replacing a doublon (charge dilution) in a $4d^4$ Mott insulator with $S=1$ spins. Impurities causing orbital dilution act either as spin defects decoupled from the surrounding ions, or generate orbital polarons along $d^3$-$d^4$ hybrid bonds. The exchange on these bonds determines which orbital is occupied by a doublon on the host site. In case of charge dilution by $3d^2$ impurities additional $\propto T_i^+T_j^+$ terms arise which enhance orbital fluctuations. We show that such terms may radically change orbital pattern at relatively low doping by $x=1/8$ hole defects. Our findings provide new perspective for future theoretical and experimental studies of doped transition metal oxides.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2016-09-29 | Journal of Superconductivity and Novel Magnetism |