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

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Park J., Risset O., Shiddiq M., Peprah M., Knowles E., Andrus M., Beedle C., Ehlers G., Podlesnyak A., Čižmár E., Nagler S., Hill S., Talham D., Meisel M.

vol. 126

issue 1

228-229

The low temperature magnetic response of Mn(III)F(salen), salen = H_{14}C_{16}N_{2}O_{2}, 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.

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1 Acta Physica Polonica A

1 2014

1 Andrus M.

1 Beedle C.

1 Ehlers G.

1 Hill S.

1 Knowles E.

1 Meisel M.

1 Nagler S.

1 Park J.

1 Peprah M.

1 Podlesnyak A.

1 Risset O.

1 Shiddiq M.

1 Talham D.

1 Čižmár E.

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