Heisenberg spin triangles in (formula presented)-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

2 Scopus citations

Abstract

We report the results of systematic experimental and theoretical studies of two closely related species of magnetic molecules of the type (formula presented) where each molecule includes a pair of triangles of exchange-coupled vanadyl (formula presented) spin (formula presented) 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 (formula presented)\ and (formula presented) nuclear magnetic resonance spin-lattice relaxation rates (formula presented) 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 (formula presented) for magnetic fields below a predicted critical field (formula presented) and (formula presented) for fields above (formula presented).

Original languageEnglish (US)
Pages (from-to)1-12
Number of pages12
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume66
Issue number5
DOIs
StatePublished - 2002

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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