Heisenberg spin triangles in {V-6}-type magnetic molecules: Experiment and theory

Luban M, Borsa F, Bud'ko S, Canfield PC, Jun S, Jung JK, Kögerler P, Mentrup D, Müller A, Modler R, Procissi D, et al. (2002)
PHYSICAL REVIEW B 66(5).

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We report the results of systematic experimental and theoretical studies of two closely related species of magnetic molecules of the type {V-6}, 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 H-1 and Na-23 nuclear magnetic resonance spin-lattice relaxation rates 1/T-1. 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 H(c)approximate to74 T and S=3/2 for fields above H-c.
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Luban M, Borsa F, Bud'ko S, et al. Heisenberg spin triangles in {V-6}-type magnetic molecules: Experiment and theory. PHYSICAL REVIEW B. 2002;66(5).
Luban, M., Borsa, F., Bud'ko, S., Canfield, P. C., Jun, S., Jung, J. K., Kögerler, P., et al. (2002). Heisenberg spin triangles in {V-6}-type magnetic molecules: Experiment and theory. PHYSICAL REVIEW B, 66(5).
Luban, M., Borsa, F., Bud'ko, S., Canfield, P. C., Jun, S., Jung, J. K., Kögerler, P., Mentrup, D., Müller, A., Modler, R., et al. (2002). Heisenberg spin triangles in {V-6}-type magnetic molecules: Experiment and theory. PHYSICAL REVIEW B 66.
Luban, M., et al., 2002. Heisenberg spin triangles in {V-6}-type magnetic molecules: Experiment and theory. PHYSICAL REVIEW B, 66(5).
M. Luban, et al., “Heisenberg spin triangles in {V-6}-type magnetic molecules: Experiment and theory”, PHYSICAL REVIEW B, vol. 66, 2002.
Luban, M., Borsa, F., Bud'ko, S., Canfield, P.C., Jun, S., Jung, J.K., Kögerler, P., Mentrup, D., Müller, A., Modler, R., Procissi, D., Suh, B.J., Torikachvili, M.: Heisenberg spin triangles in {V-6}-type magnetic molecules: Experiment and theory. PHYSICAL REVIEW B. 66, (2002).
Luban, M, Borsa, F, Bud'ko, S, Canfield, PC, Jun, S, Jung, JK, Kögerler, Paul, Mentrup, D, Müller, Achim, Modler, R, Procissi, D, Suh, BJ, and Torikachvili, M. “Heisenberg spin triangles in {V-6}-type magnetic molecules: Experiment and theory”. PHYSICAL REVIEW B 66.5 (2002).
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