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

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 -