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A single-ion single-electron cerrous magnet.

Sandeep K Gupta1, Swaminathan Shanmugan2, Thayalan Rajeshkumar1

  • 1Department of Chemistry, Indian Institute of Technology Bombay, Mumbai-400076, India. rajaraman@chem.iitb.ac.in rmv@chem.iitb.ac.in.

Dalton Transactions (Cambridge, England : 2003)
|September 13, 2019
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Summary
This summary is machine-generated.

This study introduces a novel cerium(III) complex exhibiting single-ion single-electron magnet properties. Its magnetic relaxation dynamics are dominated by direct and Raman processes, with observed quantum tunneling effects.

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Area of Science:

  • Inorganic Chemistry
  • Materials Science
  • Quantum Magnetism

Background:

  • Lanthanide complexes are explored for advanced magnetic applications.
  • Single-ion magnets (SIMs) offer potential for high-density data storage and quantum computing.
  • Developing robust SIMs with controllable magnetic properties remains a key challenge.

Purpose of the Study:

  • To synthesize and characterize novel monometallic lanthanide complexes.
  • To investigate the magnetic properties and relaxation dynamics of a cerium(III) complex.
  • To understand the origin of magnetic anisotropy using theoretical calculations.

Main Methods:

  • Synthesis of monometallic lanthanide complexes via reaction of lanthanide nitrates with a phosphonic diamide ligand.
  • Magnetic susceptibility measurements.
  • Low-temperature measurements on oriented crystals using a micro-SQUID setup.
  • Ab initio theoretical calculations.

Main Results:

  • Formation of monometallic cerium(III) and lanthanum(III) complexes, [L3Ln(NO3)3].
  • The cerium(III) complex (1) exhibits single-ion single-electron magnet behavior under a small applied magnetic field.
  • Magnetic relaxation is dominated by direct and Raman processes.
  • Strong zero-field quantum tunneling and mixing of ground state with excited mJ levels were observed.
  • Ab initio calculations provided insights into anisotropy and relaxation mechanisms.

Conclusions:

  • The synthesized cerium(III) complex functions as a single-ion single-electron magnet.
  • Quantum tunneling effects significantly influence the relaxation dynamics at low temperatures.
  • Theoretical calculations are crucial for understanding magnetic anisotropy and guiding future designs of molecular magnets.