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Group 1 elements are soft and shiny metallic solids. They are malleable, ductile, and good conductors of heat and electricity. The melting points of the alkali metals are unusually low for metals and decrease going down the group, while the density increases going down the group with the exception of potassium (Table 1).
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Tuning Magnetism Through Stoichiometric Potassium Intercalation into VOCl.

Jiaze Xie1, Brahim Marfoua2, Brianna L Hoff1

  • 1Department of Chemistry, Princeton University, Princeton, New Jersey 08544, United States.

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|September 4, 2025
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Summary
This summary is machine-generated.

Controlled potassium intercalation of layered antiferromagnets like VOCl transforms their magnetic properties. This method enables tuning from antiferromagnetism to spin-glass and ferrimagnetic states, offering new insights into layered magnetism.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Chemistry

Background:

  • Layered van der Waals (vdW) materials exhibit tunable magnetic properties through intercalation chemistry.
  • Existing methods often focus on incorporating magnetic ions into nonmagnetic materials.
  • Controlled alkali-ion intercalation offers a novel strategy to manipulate spin populations and exchange interactions in intrinsic vdW magnets.

Purpose of the Study:

  • To explore alkali-ion intercalation as a method to tune magnetic properties in intrinsic vdW magnets.
  • To demonstrate precise potassium intercalation of the layered antiferromagnet VOCl using solution-based methods.
  • To investigate the resulting magnetic phase transitions and understand the underlying spin interactions.

Main Methods:

  • Postsynthetic, solution-based intercalation of potassium into VOCl using stoichiometric organic reductants (potassium naphthalene and potassium pyrene).
  • Addressing synthetic challenges through redox-matched reductants and electrolyte-assisted homogenization.
  • Magnetic property measurements and ab initio calculations to characterize magnetic states and interactions.

Main Results:

  • Demonstrated precise potassium intercalation in KxVOCl (0 ≤ x ≤ 1) via a novel solution-based approach.
  • Observed a continuous magnetic evolution from antiferromagnetism (x=0) to a spin-glass state (0
  • Ab initio calculations confirmed the spin-glass state, attributing it to mixed valence and competing magnetic interactions.

Conclusions:

  • Established a programmable intercalation methodology for accessing metastable phases and tailoring magnetic properties in layered compounds.
  • Provided new insights into magnetism in layered materials with complex spin interactions.
  • Highlighted the potential of controlled alkali-ion intercalation for designing novel magnetic materials.