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

Conference · Wed Jan 01 00:00:00 EST 2014

OSTI ID:1136789

Park, J. - H. ^[1]; Risset, O. N. ^[2]; Shiddiq, M. ^[2]; Peprah, M. K. ^[2]; Knowles, E. S. ^[2]; Andrus, Matthew ^[2]; Beedle, C. C. ^[1]; Ehlers, Georg ^[3]; Podlesnyak, Andrey A ^[3]; Cizmar, E. ^[4]; Nagler, Stephen E ^[3]; Hill, S. ^[1]; Talham, Daniel R. ^[2]; Meisel, Mark W. ^[2]

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1. Florida State University, Tallahassee
2. University of Florida, Gainesville
3. ORNL
4. University of Pavol Jozef Safarik, Slovakia

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/kB = 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/kB = 50 K, D/kB = 2.8 K, and E/kB = 0.5 K.

• Research Organization: Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Spallation Neutron Source (SNS)
• Sponsoring Organization: USDOE Office of Science (SC)
• DOE Contract Number: DE-AC05-00OR22725
• OSTI ID: 1136789
• Resource Relation: Conference: CSMAG '13, Kosice, Slovakia, 20130617, 20130617
• Country of Publication: United States
• Language: English