title: Manifestation of spin selection rules on the quantum tunneling of magnetization in a single-molecule magnet.
abstract: We present low temperature magnetometry measurements on a new Mn3 single-molecule magnet in which the quantum tunneling of magnetization (QTM) displays clear evidence for quantum mechanical selection rules. A QTM resonance appearing only at high temperatures demonstrates tunneling between excited states with spin projections differing by a multiple of three. This is dictated by the C3 molecular symmetry, which forbids pure tunneling from the lowest metastable state. Transverse field resonances are understood by correctly orienting the Jahn-Teller axes of the individual manganese ions and including transverse dipolar fields. These factors are likely to be important for QTM in all single-molecule magnets.
authors: Department of Physics, University of Central Florida, Orlando, Florida 32816, USA.
authors: J J
authors: JJ
authors: Henderson
authors: C
authors: C
authors: Koo
authors: P L
authors: PL
authors: Feng
authors: E
authors: E
authors: del Barco
authors: S
authors: S
authors: Hill
authors: I S
authors: IS
authors: Tupitsyn
authors: P C E
authors: PC
authors: Stamp
authors: D N
authors: DN
authors: Hendrickson