title: Narrowing the Zero-Field Tunneling Resonance by Decreasing the Crystal Symmetry of Mn12 Acetate.
abstract: We report the discovery of a less symmetric crystalline phase of Mn12 acetate, a triclinic phase, resulting from recrystallizing the original tetragonal phase reported by Lis in acetonitrile and toluene. This new phase exhibits the same structure of Mn12 acetate clusters and the same positions of tunneling resonances on the magnetic field as the conventional tetragonal phase. However, the width of the zero-field resonance is at least 1 order of magnitude smaller-can be as low as 50 Oe-indicating very small inhomogeneous broadening due to dipolar and nuclear fields.
authors.affiliation: Catalan Institute of Nanoscience and Nanotechnology (ICN2), CSIC and The Barcelona Institute of Science and Technology , Campus UAB, Bellaterra, 08193 Barcelona, Spain.
authors.forename: Jordi
authors.initials: J
authors.lastname: Espín
authors.affiliation: Departament de Física Fonamental, Facultat de Física, Universitat de Barcelona , Martí i Franquès 1, 08028 Barcelona, Spain.
authors.forename: Ricardo
authors.initials: R
authors.lastname: Zarzuela
authors.affiliation: Departament de Física Fonamental, Facultat de Física, Universitat de Barcelona , Martí i Franquès 1, 08028 Barcelona, Spain.
authors.forename: Nahuel
authors.initials: N
authors.lastname: Statuto
authors.affiliation: Alba Synchrotron Light Facility , 08290 Cerdanyola del Vallés, Barcelona, Spain.
authors.forename: Jordi
authors.initials: J
authors.lastname: Juanhuix
authors.affiliation: Catalan Institute of Nanoscience and Nanotechnology (ICN2), CSIC and The Barcelona Institute of Science and Technology , Campus UAB, Bellaterra, 08193 Barcelona, Spain.|ICREA, Pg Lluı́s Companys 23 , 08100 Barcelona, Spain.
authors.forename: Daniel
authors.initials: D
authors.lastname: Maspoch
authors.affiliation: Catalan Institute of Nanoscience and Nanotechnology (ICN2), CSIC and The Barcelona Institute of Science and Technology , Campus UAB, Bellaterra, 08193 Barcelona, Spain.
authors.forename: Inhar
authors.initials: I
authors.lastname: Imaz
authors.affiliation: Physics Department, Lehman College, The City University of New York , 250 Bedford Park Boulevard West, Bronx, New York 10468-1589, United States.
authors.forename: Eugene
authors.initials: E
authors.lastname: Chudnovsky
authors.affiliation: Departament de Física Fonamental, Facultat de Física, Universitat de Barcelona , Martí i Franquès 1, 08028 Barcelona, Spain.
authors.forename: Javier
authors.initials: J
authors.lastname: Tejada