Speaker
Mr
Piotr Konieczny
(Institute of Nuclear Physics PAN, Kraków)
Description
The pressure measurements of magnetic materials give the opportunity to study the fundamental aspects of magnetism. In this study a molecular ferromagnet CoII(pyrazol)4]2[NbIV(CN)8]∙4H2O}n has been studied with the use of ac/dc magnetometry under hydrostatic pressure up to 13 kbar. The studied compound crystallizes in the I41/a space group where cyanido-bridged structure is decorated with pyrazole molecules coordinated to CoII centers [1]. It is a unique structure with one type of CoII -NC-NbIV linkage. The spin values of both magnetic ions are ½, with gCo≈4.55, gNb≈2.0 for cobalt and niobium respectively. The phase transition in ambient pressure occurs at TC=5.4 K. Initially applying pressure shifts the temperature of phase transition to lower values down to a critical point, after which further applied pressure starts to increase the TC. It has been proved that the compound is changing from a ferromagnetic ordered magnet without pressure to a ferrimagnet in high pressure.
[1] D. Pinkowicz, R. Pełka, O. Drath, W. Nitek, M. Bałanda, A. M. Majcher, G. Poneti and B. Sieklucka, Inorg. Chem,. 2010, 49, 7565-7576.
Primary author
Mr
Piotr Konieczny
(Institute of Nuclear Physics PAN, Kraków)
Co-authors
Prof.
Barbara Sieklucka
(Faculty of Chemistry, Jagiellonian University, Kraków)
Dr
Dawid Pinkowicz
(Faculty of Chemistry, Jagiellonian University, Kraków)
Dr
Robert PEŁKA
(Institute of Nuclear Physics PAN, Kraków)
Prof.
Tadeusz Wasiutyński
(Institute of Nuclear Physics PAN, Kraków)
