| EPSRC Reference: |
GR/S08343/01 |
| Title: |
ESR spectroscopy of the highly frustrated and low-dimensional magnetic systems |
| Principal Investigator: |
Petrenko, Dr OA |
| Other Investigators: |
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| Department: |
Physics |
| Organisation: |
University of Warwick |
| Scheme: |
First Grant Scheme Pre-FEC |
| Starts: |
05 August 2003 |
Ends: |
04 August 2005 |
Value (£): |
119,284
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| EPSRC Research Topic Classifications: |
| Materials Characterisation |
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| EPSRC Industrial Sector Classifications: |
| No relevance to Underpinning Sectors |
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Summary on Grant Application Form |
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The dynamics of magnetic excitations in highly frustrated and low-dimensional magnetic systems will be studied by means of Electron Spin Resonanc spectroscopy. In order to carry out such measurements a wide frequency range ESR spectrometer will be built. The list of crystals I propose to investigate includes the following: 1) CuFe02, quasi two-dimensional antiferromagnet on a triangular lattice, which exhibits as many as five unexplained spin-flop like magnetisation anomalies in an applied magnetic field; 2) pure and doped Tb2Ti2O7, a magnet on a pyrochlore lattice, which could be described as a spin-liquid; 3) molecular magnets (5CAP)2CuCl4 and (5MAP)2CuCl4, two-dimensional square-lattice Heisenberg antiferromagnets witl weak exchange interactions.In CuFe02, the magnetic resonance will be studied to examine the magnetic phase transition and to establish the relative importance of the various magnetic interactions that are present in this system. In Tb2Ti2O7, ESR spectroscopy should help to verify whether or not an external field changes tt range of the magnetic correlations and to establish the influence of further-neighbour interactions on the ground state formation. In the molecular magnets, the ESR spectrum will be investigated in order to observe the theoretically predicted instability of the magnetic excitations in strong magneti fields, where the spin waves become unstable with respect to spontaneous two-magnon decay.
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Key Findings |
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This information can now be found on Gateway to Research (GtR) http://gtr.rcuk.ac.uk
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Potential use in non-academic contexts |
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Impacts |
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| Description |
This information can now be found on Gateway to Research (GtR) http://gtr.rcuk.ac.uk |
| Summary |
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| Date Materialised |
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Sectors submitted by the Researcher |
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This information can now be found on Gateway to Research (GtR) http://gtr.rcuk.ac.uk
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| Project URL: |
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| Further Information: |
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| Organisation Website: |
http://www.warwick.ac.uk |