Hysteresis Loops in an Oxo-centered {Mn3O}-type Spin Triangle Probed with a Pulsed Field

作者：Park J N^*; Suh B J; Choi K Y; Nojiri H; Jang Z H

来源：Journal of the Korean Physical Society, 2011, 59(2): 317-321.

DOI：10.3938/jkps.59.317

• Single molecular magnet
• Level crossing
• Landan-Zener-Stuckelberg transition
• High-field pulsed magnet

We have investigated the energy gap responsible for the quantum transition by measuring the magnetization of a trinuclear oxo-centered Mn complex; [MnO3(O2CPh)(6)(pyr)(2)(H2O)]center dot 0.5 MeCN. The equilibrium magnetization was measured with a superconducting quantum interference device (SQUID) magnetometer and was analyzed with an irreducible tensor operator (ITO) technique to obtain time magnetic exchange and the anisotropy constants. The unusual magnetization steps observed at B approximate to 0 in the hysteresis from pulsed magnet experiments were successfully reproduced with a numerical simulation based on a Bloch-type equation including a Landau-Zener-Stuckelberg (LZS) transition term for which the energy gap is field dependent, and Delta(0) = 2.0 mK at B = 0.

• 出版日期2011-8