Nalazite se na CroRIS probnoj okolini. Ovdje evidentirani podaci neće biti pohranjeni u Informacijskom sustavu znanosti RH. Ako je ovo greška, CroRIS produkcijskoj okolini moguće je pristupi putem poveznice www.croris.hr
izvor podataka: crosbi !

Macroscopic quantum tunneling in Mn12-acetat (CROSBI ID 502690)

Prilog sa skupa u zborniku | sažetak izlaganja sa skupa

Beiter, Johannes ; Reissner, Michael ; Hilscher, G ; Steiner, Walter ; Pajić, Damir ; Zadro, Krešo ; Bartel, M ; Linert, W Macroscopic quantum tunneling in Mn12-acetat // 54. Jahrestagung der Oesterreichischen Physikalischen Gesellschaft / Lippitsch, M (ur.). Linz: Oesterreichische Physikalische Gesellschaft, 2004. str. 100-100-x

Podaci o odgovornosti

Beiter, Johannes ; Reissner, Michael ; Hilscher, G ; Steiner, Walter ; Pajić, Damir ; Zadro, Krešo ; Bartel, M ; Linert, W

engleski

Macroscopic quantum tunneling in Mn12-acetat

Molecules provide the exciting opportunity to study magnetism on the passage from atomic to macroscopic level. One of the most interesting effects in such mesoscopic systems is the appearance of quantum tunnelling of magnetization (MQT) at low temperatures. In the last decade molecular chemistry has had a large impact in this field by providing new single molecule magnets. They consist of small clusters exhibiting superparamagnetic behaviour, similar to that of conventional nanomagnetic particles. The advantage of these new material is that they form macroscopic samples consisting of regularly arranged small identical high-spin clusters which are widely separated by organic molecules. The lack of distributions in size and shape of the magnetic clusters and the very weak intercluster interaction lead in principle to only one barrier for the spin reversal. We present detailed magnetic investigations on a Mn12-ac single crystal. In this compound the tetragonal ordered cluster consist of a central tetrahedron of four Mn4+ (S=3/2) atoms surrounded by eight Mn3+ (S=2) atoms with antiparallel oriented spins, leading to an overall spin moment of S=10. In the hysteresis loops nine different jumps at regularly spaced fields are identified in the investigated temperature range (1.5K<T<3K). At these fields the relaxation of moment due to thermal activation is superimposed by strong quantum tunnelling. In lowering the temperature the time dependence changes from thermally activated to thermally assisted tunneling.

single molecule magnet; Mn12-acetate; macroscopic quantum tunneling

nije evidentirano

nije evidentirano

nije evidentirano

nije evidentirano

nije evidentirano

nije evidentirano

Podaci o prilogu

100-100-x.

2004.

objavljeno

Podaci o matičnoj publikaciji

54. Jahrestagung der Oesterreichischen Physikalischen Gesellschaft

Lippitsch, M

Linz: Oesterreichische Physikalische Gesellschaft

Podaci o skupu

54. Jahrestagung der Oesterreichischen Physikalischen Gesellschaft

poster

28.09.2004-30.09.2004

Linz, Austrija

Povezanost rada

Fizika

Poveznice