Heisenberg spin triangles in {V6}-type magnetic molecules: Experiment and theory

Marshall Luban*, Ferdinando Borsa, Sergey Bud'ko, Paul Canfield, Suckjoon Jun, Jae Kap Jung, Paul Kögerler, Detlef Mentrup, Achim Müller, Robert Modler, Daniel Procissi, Byoung Jin Suh, Milton Torikachvili

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

51 Scopus citations

Abstract

We report the results of systematic experimental and theoretical studies of two closely related species of magnetic molecules of the type {V6}, where each molecule includes a pair of triangles of exchange-coupled vanadyl (VO2+, spin s=1/2) ions. The experimental studies include the temperature dependence of the low-field susceptibility from room temperature down to 2 K, the dependence of the magnetization on magnetic field up to 60 T for several low temperatures, the temperature dependence of the magnetic contribution to the specific heat, and the 1H and 23Na nuclear magnetic resonance spin-lattice relaxation rates 1/T1. This body of experimental data is accurately reproduced for both compounds by a Heisenberg model for two identical uncoupled triangles of spins; in each triangle, the spins interact via isotropic antiferromagnetic exchange, where two of the three V-V interactions have exchange constants that are equal and an order of magnitude larger than the third; the ground-state eigenfunction has total spin quantum number S=1/2 for magnetic fields below a predicted critical field Hc≈74 T and S=3/2 for fields above Hc.

Original languageEnglish (US)
Article number054407
Pages (from-to)544071-5440712
Number of pages4896642
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume66
Issue number5
DOIs
StatePublished - Aug 1 2002

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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