Reciprocating Thermal Behavior in Multichannel Relaxation of Cobalt(II) Based Single Ion Magnets
Cyril Rajnák, Ján Titiš, Roman Boča
Abstract
A series of mononuclear Co(II) complexes showing slow magnetic relaxation is assessed from the point of view of relaxation mechanisms. In certain cases, the reciprocating thermal behavior is detected: On cooling, the slow relaxation time is prolonged until a certain limit and then, unexpectedly, is accelerated. The low-temperature magnetic data can be successfully fitted by assuming Raman and/or phonon bottleneck mechanisms of the slow magnetic relaxation for the high-frequency relaxation channel. An additional term with the negative temperature exponent is capable of reproducing the whole experimental dataset.
Topics & Concepts
Reciprocating motionRelaxation (psychology)MagnetIonNuclear magnetic resonanceCondensed matter physicsMagnetic relaxationMaterials scienceChemistryMagnetic fieldThermodynamicsPhysicsMagnetizationQuantum mechanicsPsychologyGas compressorSocial psychologyOrganic chemistryMagnetism in coordination complexesLanthanide and Transition Metal ComplexesElectron Spin Resonance Studies