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Controlling Electron Spin Decoherence in Nd-based Complexes via Symmetry Selection.

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Area of Science:

  • Quantum computing
  • Molecular magnetism
  • Solid-state chemistry

Background:

  • Long decoherence time is critical for molecular magnets in quantum computation.
  • The role of local symmetry in spin decoherence is not well understood, despite its known impact on spin-lattice relaxation.

Purpose of the Study:

  • To investigate the effect of local symmetry on spin decoherence in neodymium-based molecular magnets.
  • To explore the relationship between local symmetry and magnetic properties.

Main Methods:

  • Synthesis and characterization of two neodymium moieties with different local symmetries (C1 and C4).
  • High-frequency electron paramagnetic resonance (HF-EPR) studies to determine magnetic anisotropy.
  • 240 GHz Pulsed EPR studies to measure decoherence times.
  • First-principle calculations to support experimental findings.

Main Results:

  • Two nine-coordinated neodymium complexes, [Nd(CO3)4H2O]5-, with C1 and C4 local symmetries were synthesized.
  • Both complexes exhibit easy-plane magnetic anisotropy.
  • Phonon bottleneck effect is identified as crucial for magnetic relaxation.
  • Higher local symmetry (C4) correlates with longer decoherence times.

Conclusions:

  • Local symmetry significantly influences spin decoherence in molecular magnets.
  • The study provides a pathway for designing molecular magnets with enhanced quantum coherence properties.
  • Findings support the use of symmetry engineering for optimizing molecular magnets in quantum technologies.