ACTA

Magnetic Response of Mn(III)F(salen) at Low Temperatures

J.-H. Park^a, O.N. Risset^b, M. Shiddiq^c, M.K. Peprah^d, E.S. Knowles^d, M.J. Andrus^b, C.C. Beedle^a, G. Ehlers^e, A. Podlesnyak^e, E. Čižmár^f, S.E. Nagler^e, S. Hill^c, D.R. Talham^b, M.W. Meisel^d,f
^a National High Magnetic Field Laboratory (NHMFL), Florida State Univ., Tallahassee, FL 32310-3706, USA
^b Department of Chemistry, University of Florida, Gainesville, FL 32611-7200, USA
^c Department of Physics and NHMFL, Florida State University, Tallahassee, FL 32310-3706, USA
^d Department of Physics and NHMFL, University of Florida, Gainesville, FL 32611-8440, USA
^e Quantum Condensed Matter Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831-6477, USA
^f Institute of Physics, Faculty of Science, P.J. Šafárik University, Park Angelinum 9, 04154 Košice, Slovakia

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The low temperature magnetic response of Mn(III)F(salen), salen = H₁₄C₁₆N₂O₂, an S=2 linear-chain system, has been studied. Using a single crystal with the field applied perpendicular to the chain direction, torque magnetometry, down to 20 mK and up to 18 T, revealed a feature at 3.8 T when T ≤ 400 mK. ESR ( ≈200 GHz) studies, using single crystals at 4 K and in 5 T, have not detected any signal. In 10 mT, the temperature dependence of the susceptibility of powder-like samples can be reasonably fit when J/k_B=50 K and g=2. In addition, these data are unchanged for P ≤1.0 GPa. Using a randomly-oriented, powder-like, deuterated (12 of 14 H replaced by D) sample of 2.2 g at 270 mK, neutron scattering data, acquired with the Cold Neutron Chopper Spectrometer at the Spallation Neutron Source, show several well defined excitations that may be from the zero-field energy levels of antiferromagnetic S=2 spins with g=2, J/k_B=50 K, D/k_B=2.8 K, and E/k_B=0.5 K.

DOI: 10.12693/APhysPolA.126.228
PACS numbers: 75.50.Ee, 78.70.Nx, 76.30.-v, 75.10.Jm