A wheel-shaped single-molecule magnet of [MnII 3MnIII 4]: quantum tunneling of magnetization under static and pulse magnetic fields. - Koizumi S; Nihei M; Shiga T; Nakano M; Nojiri H; Bircher R; Waldmann O; Ochsenbein ST; Güdel HU; Fernandez-Alonso F; Oshio H (Chemistry (Weinheim an der Bergstrasse, Germany), 2007)