Einfluss der Dzyaloshinskii-Moriya-Wechselwirkung auf magnetische Moleküle

Heesing C. Einfluss der Dzyaloshinskii-Moriya-Wechselwirkung auf magnetische Moleküle. Bielefeld: Universität Bielefeld; 2016

Application of the finite-temperature Lanczos method for the evaluation of magnetocaloric properties of large magnetic molecules

We discuss the magnetocaloric properties of gadolinium containing magnetic molecules which potentially could be used for sub-Kelvin cooling. We show that a degeneracy of a singlet ground state could be advantageous in order to support adiabatic processes to low temperatures and simultaneously minimize disturbing dipolar interactions. Since the Hilbert spaces of such spin systems assume very large dimensions we evaluate the necessary thermodynamic observables by means of the Finite-Temperature Lanczos Method.Comment: 7 pages, 10 figures, invited for the special issue of EPJB on "New trends in magnetism and magnetic materials

Copper Lanthanide Phosphonate Cages: Highly Symmetric {Cu(3)Ln(9)P(6)} and {Cu(6)Ln(6)P(6)} Clusters with C-3v and D-3h Symmetry

Pineda EM, Heesing C, Tuna F, et al. Copper Lanthanide Phosphonate Cages: Highly Symmetric {Cu(3)Ln(9)P(6)} and {Cu(6)Ln(6)P(6)} Clusters with C-3v and D-3h Symmetry. Inorganic Chemistry. 2015;54(13):6331-6337.Two families of copper lanthanide phosphonate clusters have been obtained through reaction of [Cu-2((O2CBu)-Bu-t)(4)((HO2CBu)-Bu-t)(2)] and either Ln(NO3)(3)center dot nH(2)O or [Ln(2)(O(2)C(t)nu)(6)((HO2CBu)-Bu-t)(6)} and tert-butylphosphonic acid or an amino-functionalized phosphonic acid. The clusters, with general formula [Cu(MeCN)(4)][Cu(3)Ln(9)(mu(3)-OH)(7)((O3PBu)-Bu-t)(6)((O2CBu)-Bu-t)(15)} and [Cu(6)Ln(6)(mu(3)-OH)(6)(O3PC(NH2)Me-2)(6)((O2CBu)-Bu-t)(12)}, were structurally characterized through single crystal X-ray diffraction and possess highly symmetric metal cores with approximately C-3v and D-3h point symmetry, respectively. We have investigated the possible application of the isotropic analogues in magnetic cooling, where we were able to observe that up to around 70% of the theoretical magnetic entropy change is obtained. Simulation of the magnetic data shows antiferromagnetic coupling between the spin centers, which explains the magnetic entropy value observed

CCDC 1053726: Experimental Crystal Structure Determination

Related Article: Eufemio Moreno Pineda , Christian Heesing , Floriana Tuna , Yan-Zhen Zheng , Eric J. L. McInnes , Jürgen Schnack , and Richard E. P. Winpenny|2015|Inorg.Chem.|54|6331|doi:10.1021/acs.inorgchem.5b0064

CCDC 1053728: Experimental Crystal Structure Determination

Related Article: Eufemio Moreno Pineda , Christian Heesing , Floriana Tuna , Yan-Zhen Zheng , Eric J. L. McInnes , Jürgen Schnack , and Richard E. P. Winpenny|2015|Inorg.Chem.|54|6331|doi:10.1021/acs.inorgchem.5b0064

CCDC 1053727: Experimental Crystal Structure Determination

Related Article: Eufemio Moreno Pineda , Christian Heesing , Floriana Tuna , Yan-Zhen Zheng , Eric J. L. McInnes , Jürgen Schnack , and Richard E. P. Winpenny|2015|Inorg.Chem.|54|6331|doi:10.1021/acs.inorgchem.5b0064

CCDC 1053732: Experimental Crystal Structure Determination

Related Article: Eufemio Moreno Pineda , Christian Heesing , Floriana Tuna , Yan-Zhen Zheng , Eric J. L. McInnes , Jürgen Schnack , and Richard E. P. Winpenny|2015|Inorg.Chem.|54|6331|doi:10.1021/acs.inorgchem.5b0064

CCDC 1053729: Experimental Crystal Structure Determination

Related Article: Eufemio Moreno Pineda , Christian Heesing , Floriana Tuna , Yan-Zhen Zheng , Eric J. L. McInnes , Jürgen Schnack , and Richard E. P. Winpenny|2015|Inorg.Chem.|54|6331|doi:10.1021/acs.inorgchem.5b0064

CCDC 1053730: Experimental Crystal Structure Determination

Related Article: Eufemio Moreno Pineda , Christian Heesing , Floriana Tuna , Yan-Zhen Zheng , Eric J. L. McInnes , Jürgen Schnack , and Richard E. P. Winpenny|2015|Inorg.Chem.|54|6331|doi:10.1021/acs.inorgchem.5b0064

CCDC 1053731: Experimental Crystal Structure Determination

Related Article: Eufemio Moreno Pineda , Christian Heesing , Floriana Tuna , Yan-Zhen Zheng , Eric J. L. McInnes , Jürgen Schnack , and Richard E. P. Winpenny|2015|Inorg.Chem.|54|6331|doi:10.1021/acs.inorgchem.5b0064