TY - JOUR

T1 - Heisenberg spin triangles in (formula presented)-type magnetic molecules

T2 - Experiment and theory

AU - Luban, Marshall

AU - Borsa, Ferdinando

AU - Bud’ko, Sergey

AU - Canfield, Paul

AU - Jun, Suckjoon

AU - Jung, Jae Kap

AU - Kögerler, Paul

AU - Mentrup, Detlef

AU - Müller, Achim

AU - Modler, Robert

AU - Procissi, Daniel

AU - Suh, Byoung Jin

AU - Torikachvili, Milton

N1 - Funding Information:
The authors thank Dr Louis Benelli (Institut Chirurgie Plastique Clinique Hartman, Paris) for his help with human studies on adipose tissue and Philippe Juraver (INSERM, UMR-S747) for the handling of rats. Contract grant sponsor are the Institut National de la Santé et de la Recherche Médicale and the Université Paris Descartes (recurrent fundings). The Ligue Nationale contre le Cancer has awarded a 3 year fellowship to JMB. The Association pour la Recherche contre le Cancer has awarded a 3 year fellowship to GP.

PY - 2002

Y1 - 2002

N2 - 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).

AB - 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).

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U2 - 10.1103/PhysRevB.66.054407

DO - 10.1103/PhysRevB.66.054407

M3 - Article

AN - SCOPUS:85032421628

SN - 1098-0121

VL - 66

SP - 1

EP - 12

JO - Physical Review B - Condensed Matter and Materials Physics

JF - Physical Review B - Condensed Matter and Materials Physics

IS - 5

ER -