Knickelbein, Mark B.2004-12-142004-12-1420012001http://hdl.handle.net/2003/1886010.17877/DE290R-1651enThe American Physical SocietyPhysical Review Letters530Experimental Observation of Superparamagnetism in Manganese Clusters10.1103/PhysRevLett.86.5255article (journal)