Berlin 2005 – wissenschaftliches Programm
Bereiche | Tage | Auswahl | Suche | Downloads | Hilfe
MA: Magnetismus
MA 14: Molekularer Magnetismus
MA 14.9: Vortrag
Samstag, 5. März 2005, 15:45–16:00, TU H1012
Pressure dependence of superexchange mediated antiferromagnetism in XCl2(PM)2 (X = Fe, Co, Ni; PM = pyrimidine) — •S. Süllow1, J. Kreitlow1, A.U.B. Wolter1, D. Menzel1, J. Schoenes1, K. Doll2 und R. Feyerherm3 — 1Institut für Festkörperphysik, TU Braunschweig, 38106 Braunschweig — 2Institut für Mathematische Physik, TU Braunschweig, 38106 Braunschweig — 3Hahn-Meitner-Institut, 14109 Berlin
We present measurements of the magnetic susceptibility χ (T) on the pyrimidine bridged transitions metal complexes XCl2(PM)2 (X = Fe,Co,Ni; PM = pyrimidine = C4N2H4) under externally applied pressure. From our data we derive the pressure response of the antiferromagnetic phase transition temperatures (ambient pressure values of TN: 6.4 K for X = Fe, 4.7 K for Co and 15.9 K for Ni). For the three materials the transition temperatures increases by about 15% at a highest pressure of ∼ 8kbar. We compare our data with electronic structure calculations and find very good agreement between the theoretically predicted pressure response of TN and the bulk module of FeCl2(PM)2, B0 = 15 GPa, with our experimental observations.
Supported by DFG under contract no. SU229/6-1