Group leader

Adler, Peter
Peter Adler
Gruppenleiter
Telefon: +49 351 4646-3203

Mößbauer spectroscopy

References

1.
S. Medvedev, T. M. McQueen, I. A. Troyan, T. Palasyuk, M. I. Eremets, R. J. Cava, S. Naghavi, F. Casper, V. Ksenofontov, G. Wortmann, and C. Felser, "Electronic and magnetic phase diagram of β-Fe1.01Se with superconductivity at 36.7 K under pressure," Nature Materials 8 (8), 630-633 (2009).
2.
T. Gasi, V. Ksenofontov, J. Kiss, S. Chadov, A. K. Nayak, M. Nicklas, J. Winterlik, M. Schwall, P. Klaer, P. Adler, and C. Felser, "Iron-based Heusler compounds Fe2YZ: Comparison with theoretical predictions of the crystal structure and magnetic properties," Physical Review B 87 (6), 064411-1-064411-12 (2013).
3.
A. K. Paul, M. Reehuis, V. Ksenofontov, B. H. Yan, A. Hoser, D. M. Többens, P. M. Abdala, P. Adler, Martin Jansen, and C. Felser, "Lattice Instability and Competing Spin Structures in the Double Perovskite Insulator Sr2FeOsO6," Physical Review Letters 111, 1-5 (2013).

Mössbauer Spectroscopy

Mössbauer spectroscopy is based on the recoil-free nuclear resonance absorption of γ radiation. This so-called Mössbauer effect was discovered in 1958 by Rudolf L. Mößbauer (1929 – 2011) within his PhD thesis. He obtained the Nobel prize in physics in 1961.

 

The application of Mössbauer spectroscopy in solid state and materials research takes advantage of the hyperfine interactions, i.e. the interactions between the electronic shell and the nuclear charge distribution which are sensitive to the chemical environment. The most important parameters extracted from the spectra are the isomer shift IS, the quadrupole splitting QS, and the magnetic hyperfine field Bhf. Mössbauer spectroscopy is a local probe which supplements the information from scattering techniques and yields information on oxidation states and chemical bonding, coordination environments, magnetic ordering phenomena, and dynamical effects.

At present one Mössbauer measuring station for 57Fe Mössbauer spectroscopy is available which consists of a WissEl Mössbauer spectrometer, a 57Co/Rh source, and a Janis closed cycle refrigerator (CCR) cryostat (SHI-850-5) for experiments between 5 and 300 K. 

Several materials of contemporary interest in solid state and materials science are studied, for instance iron-based pnictide and chalcogenide superconductors as well as related Mott insulating compounds, magnetic Heusler alloys, and transition metal oxides.

 
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