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Radio Frequency Magnetron Sputtering of GdBa2Cu3O7âˆ'ÃŽ ´/ La0.67Sr0.33MnO3 Quasi-bilayer Films on SrTiO3 STO Single-crystal Substrates

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Spin-orbit-driven magnetic structure and excitation in the 5d pyrochlore Cd2Os2O7.

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  • 1Quantum Condensed Matter Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA.

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|June 9, 2016
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Spin-orbit coupling (SOC) in 5d Os(5+) oxides like Cd2Os2O7 subtly influences the ground state but drives magnetic order and metal-insulator transitions. This study reveals SOC

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Solid-State Chemistry

Background:

  • Spin-orbit coupling (SOC) is crucial in 5d oxides, impacting electronic states and metal-insulator transitions (MITs).
  • In 5d(5) iridates, SOC drives MITs concurrent or separated from magnetic order.
  • The role of SOC in other 5d configurations, like 5d(3) osmates, is less understood, with expectations of reduced SOC effects.

Purpose of the Study:

  • To investigate the role of spin-orbit coupling (SOC) in the 5d(3) osmate pyrochlore Cd2Os2O7.
  • To elucidate the electronic and magnetic properties governing the metal-insulator transition (MIT) in this material.
  • To clarify the interplay between SOC, magnetic order, and the MIT in osmium-based oxides.

Main Methods:

  • Neutron diffraction to determine the magnetic structure of Cd2Os2O7.
  • Resonant inelastic X-ray scattering (RIXS) to probe electronic and magnetic excitations.
  • Analysis of energy scales to understand the MIT mechanism.

Main Results:

  • The magnetic structure of Cd2Os2O7 was resolved.
  • Spin-orbit coupling (SOC) plays a subtle role in establishing the electronic ground state.
  • SOC was found to be the primary driver of magnetic order and the emergence of multiple spin-flip magnetic excitations, which are linked to the MIT.

Conclusions:

  • Cd2Os2O7 exhibits a metal-insulator transition (MIT) intertwined with magnetic order, similar to pyrochlore iridates.
  • Despite expectations of reduced SOC effects in 5d(3) osmates, SOC is crucial for driving magnetic order and the MIT in Cd2Os2O7.
  • The findings highlight the complex and sometimes subtle role of SOC in determining the electronic and magnetic properties of 5d transition metal oxides.