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Magnetic excitations in low-dimensional compounds of transition metal ions

English title Magnetic excitations in low-dimensional compounds of transition metal ions
Applicant Güdel Hans-Ulrich
Number 105175
Funding scheme Project funding (Div. I-III)
Research institution Departement für Chemie und Biochemie Universität Bern
Institution of higher education University of Berne - BE
Main discipline Condensed Matter Physics
Start/End 01.01.2005 - 31.12.2007
Approved amount 424'329.00
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Keywords (6)

Spin clusters; Single molecule magnets; Quantum phase transitions; Bose-Einstein condensation; Neutron scattering; magnetic excitations

Lay Summary (English)

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Lay summary
So-called "Single Molecule Magnets" (SMM), i.e. molecular entities that are capable of magnetically storing a bit of information at cryogenic temperatures, are in the focus of very intense research by both physicists and chemists. We are involved both in the synthesis of new systems and in the physical characterisation by magnetic measurements and inelastic neutron scattering (INS). The latter technique proves to be highly valuable to gain detailed insight into the mechanisms behind the SMM phenomenon. In particular, we use it to determine energy splittings in the electronic ground state resulting from exchange and anisotropy interactions. These can in turn be used to rationalise the magnetisation tunneling processes and their kinetics. This research is characterised by numerous international collaborations.
Our work on quantum phase transitions in dimer-based copper halides focussed on the direct tuning of quantum fluctuations in TlCuCl3 by pressure application and on the investigation, including spin dynamics and phase diagram, of the new organic spin ladder material (C5H12N)2CuBr4. We succeeded to grow for the first time fully deuterated and gram-sized high quality single crystals of the latter compound. Neutron scattering experiments were performed at SINQ (PSI) and ILL Grenoble (F), and extensive bulk measurements (specific heat, magnetisation, magneto-caloric effect, thermal expansion) at HMI Berlin (D), NHMFL Los Alamos (US), and University of Cologne (D).
Direct link to Lay Summary Last update: 21.02.2013

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Associated projects

Number Title Start Funding scheme
132877 Magnetic Excitations in Low-Dimensional Arrays of Quantum Spins 01.01.2011 Project funding (Div. I-III)
172659 New materials for honeycomb-lattice and single-ion magnets 01.08.2017 Project funding (Div. I-III)
150257 Dimensional and Anisotropy Control of Model Quantum Magnets 01.01.2014 Project funding (Div. I-III)
117817 Magnetic excitations in novel metal-organic quantum materials and molecular magnets 01.01.2008 Project funding (Div. I-III)
65120 Magnetic Neutron Scattering of Low Dimensional Transition Metal Ion Compounds 01.01.2002 Project funding (Div. I-III)

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