2020
DOI: 10.1103/physrevresearch.2.033430
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Ferromagnetic kinetic exchange interaction in magnetic insulators

Abstract: The superexchange theory predicts dominant antiferromagnetic kinetic interaction when the orbitals accommodating magnetic electrons are covalently bonded through diamagnetic bridging atoms or groups. Here we show that explicit consideration of magnetic and (leading) bridging orbitals, together with the electron transfer between the former, reveals a strong ferromagnetic kinetic exchange contribution. First-principles calculations show that it is comparable in strength with antiferromagnetic superexchange in a … Show more

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Cited by 14 publications
(5 citation statements)
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“…We have to quantitatively construct model Hamiltonian based on the first principles based microscopic interactions. In particular, the elastic coupling plays a crucial role: to adequately describe the elastic coupling in the Jahn-Teller crystals, the Green's function based method would be indispensable [44,37].…”
Section: Discussionmentioning
confidence: 99%
See 1 more Smart Citation
“…We have to quantitatively construct model Hamiltonian based on the first principles based microscopic interactions. In particular, the elastic coupling plays a crucial role: to adequately describe the elastic coupling in the Jahn-Teller crystals, the Green's function based method would be indispensable [44,37].…”
Section: Discussionmentioning
confidence: 99%
“…Let us derive an effective model for the low-energy phenomena. The energy scales of the microscopic interactions are in the order of Coulomb (U ≈ 3 eV [7,35]), spin-orbit (λ ≈ 0.25 − 0.35 eV [16,33,36]), electron transfer (t ≈ 50 meV) and Jahn-Teller ( ωg ≈ 50 meV [33]), and elastic coupling [37]. Thus, we consider the interactions with the larger energy scales.…”
Section: Effective Modelmentioning
confidence: 99%
“…To date, there is no explicit model that can be applied to interpret the superexchange mediated by the d orbitals of non-covalent and diamagnetic metal ions. [42,43] Nevertheless, we may apply the Goodenough-Kanamori rules of the M-O-M model with linear structures, where the doubly occupied p z orbital of the oxygen anionic mediator is replaced by the doubly occupied d z2 orbital of the diamagnetic Pd II. [44][45][46] The virtual electron transfer from the half-filled d z 2 orbital of Ni II to the doubly occupied d z2 of Cu II can be considered as a potential ferromagnetic exchange.…”
Section: Magnetic Studiesmentioning
confidence: 99%
“…Although ferromagnetic Heisenberg model is explored to understand itinerant ferromagnetism 18 but the real difficulty lies in arriving at the effective Hamiltonian of an interacting spin * kalpataru.pradhan@saha.ac.in system with negative exchange coupling 16 . Ferromagnetic kinetic exchange between localized spins that arises from an interplay of spin and orbital degrees of freedom is relatively rare 19 .…”
Section: Introductionmentioning
confidence: 99%