title: Switching of Slow Magnetic Relaxation Dynamics in Mononuclear Dysprosium(III) Compounds with Charge Density.
abstract: The symmetry around a Dy ion is recognized to be a crucial parameter dictating magnetization relaxation dynamics. We prepared two similar square-antiprismatic complexes, [Dy(LOMe)2(H2O)2](PF6) (1) and Dy(LOMe)2(NO3) (2), where LOMe = [CpCo{P(O)(O(CH3))2}3], including either two neutral water molecules (1) or an anionic nitrate ligand (2). We demonstrated that in this case relaxation dynamics is dramatically affected by the introduction of a charged ligand, stabilizing the easy axis of magnetization along the nitrate direction. We also showed that the application of either a direct-current field or chemical dilution effectively stops quantum tunneling in the ground state of 2, thereby increasing the relaxation time by over 3 orders of magnitude at 3.5 K.
authors.affiliation: Department of Chemistry, Korea University , Seoul 136-713, Republic of Korea.
authors.forename: Kwang Soo
authors.initials: KS
authors.lastname: Lim
authors.affiliation: Instituto de Ciencia Molecular (ICMol), Universidad de Valencia , C/Catedrático José Beltrán 2, E-46980 Paterna, Spain.
authors.forename: José J
authors.initials: JJ
authors.lastname: Baldoví
authors.affiliation: Department of Chemistry, Korea University , Seoul 136-713, Republic of Korea.
authors.forename: Woo Ram
authors.initials: WR
authors.lastname: Lee
authors.affiliation: Department of Chemistry, Korea University , Seoul 136-713, Republic of Korea.
authors.forename: Jeong Hwa
authors.initials: JH
authors.lastname: Song
authors.affiliation: Department of Physics, The Catholic University of Korea , Buchon 420-743, Republic of Korea.
authors.forename: Sung Won
authors.initials: SW
authors.lastname: Yoon
authors.affiliation: Department of Physics, The Catholic University of Korea , Buchon 420-743, Republic of Korea.
authors.forename: Byoung Jin
authors.initials: BJ
authors.lastname: Suh
authors.affiliation: Instituto de Ciencia Molecular (ICMol), Universidad de Valencia , C/Catedrático José Beltrán 2, E-46980 Paterna, Spain.
authors.forename: Eugenio
authors.initials: E
authors.lastname: Coronado
authors.affiliation: Instituto de Ciencia Molecular (ICMol), Universidad de Valencia , C/Catedrático José Beltrán 2, E-46980 Paterna, Spain.
authors.forename: Alejandro
authors.initials: A
authors.lastname: Gaita-Ariño
authors.affiliation: Department of Chemistry, Korea University , Seoul 136-713, Republic of Korea.
authors.forename: Chang Seop
authors.initials: CS
authors.lastname: Hong