L. J. de Jongh
- Short-range correlations in d-f cyanido-bridged assemblies with XY and XY-Heisenberg anisotropy
- Dalton Transactions
- Volume | Issue number
- 40 | 33
- Pages (from-to)
- Document type
- Faculty of Science (FNWI)
- Van 't Hoff Institute for Molecular Sciences (HIMS)
Two new d-f cyanido-bridged 1D assemblies [RE(pzam)3(H2O)Mo(CN)8]·H2O (RE = Sm(III), Er(III)) were synthesized and their magneto-structural properties have been studied by field-dependent magnetization and specific heat measurements at low temperatures (≥0.3 K). Below ≈ 10 K the ground state of both the Sm(III) and Er(III) ions is found to be a Kramers doublet with effective spin S = 1/2. From analyses of the low-temperature magnetic specific heat and magnetization the exchange coupling between these RE(III) effective spins and the Mo(V) spins S = 1/2 along the structural chains has been determined. It is found to be antiferromagnetic, with J∥/kB = −2.6 K and Ising-Heisenberg symmetry of the interaction (J∥/J⊥ = 0.3) for RE = Sm(III), whereas the compound with RE = Er(III) behaves as a pure XY chain, with J⊥/kB = −1.0 K. For the compound [Sm(pzam)3(H2O)Mo(CN)8]·H2O a small λ-type anomaly in the specific heat is observed at about 0.6 K, which is ascribed to a transition to long-range magnetic ordering induced by weak interchain interactions of dipolar origin. No evidence for 3D interchain magnetic ordering is found in the Er(III) analogue.
- go to publisher's site
If you believe that digital publication of certain material infringes any of your rights or (privacy) interests, please let the Library know, stating your reasons. In case of a legitimate complaint, the Library will make the material inaccessible and/or remove it from the website. Please Ask the Library, or send a letter to: Library of the University of Amsterdam, Secretariat, Singel 425, 1012 WP Amsterdam, The Netherlands. You will be contacted as soon as possible.