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Cold neutron time-focussing time-of-flight spectrometer IN6

IN6 is a time-focussing time-of-flight spectrometer designed for quasielastic and inelastic scattering for incident wavelengths in the range of 4 to 6 Å.

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Applications

Study of dynamics and relaxation properties in condensed matter exploiting both nuclear and magnetic scattering

  • Vibrational density of states of crystalline and amorphous solids
  • Dynamics of soft condensed matter such as polymers, proteins, biological membranes and gels
  • Local and long range diffusion of liquids, solutions and confined systems
  • Properties of quantum liquids, Fermi and non-Fermi systems
  • Phase transitions and quantum critical phenomena in polycrystals and single crystals
  • Spin dynamics in high-Tc superconductors
  • Properties of crystal field splittings

Examples


Vibrational dynamics of amorphous ice:

The low-energy dynamics of amorphous ice structures is an intriguing topic in the field of vibrational properties of disordered matter. Inelastic properties which are supposed to be characteristic of the response of glass forming materials, e.g. the notorious 'Boson' peak, are strongly suppressed in any amorphous ice structure.

Figure left:

The figure reports the generalized density of states of six amorphous ice structures prepared at different conditions. Structures commonly referred to as low-density amorphous (LDA, density = 31 molec./nm3), high-density amorphous (HDA, density = 39 molec./nm3) and very high-density amorphous (vHDA, density = 42 molec./nm3) structures are indicated in the figure.


Further reading:

[1] H. Schober, M.M. Koza, A. Toelle, F. Fujara, C.A. Angell, R. Boehmer, Physica B, 241-243, 897, (1998)

[2] M.M. Koza, B. Geil, H. Schober, F. Natali, Phys. Chem. Chem. Phys. 7, 1423, (2005)

[3] M.M. Koza, B. Geil, K. Winkel, C. Koehler, F. Czeschka, M. Scheuermann, H. Schober, T. Hansen, Phys. Rev. Lett. 94, 125506, (2005)

[4] Th. Straessle, S. Klotz, G. Hamel, M.M. Koza, H. Schober, Phys. Rev. Lett. 99, 175501, (2007)

[5] M.M. Koza, H. Schober, S.F. Parker, J. Peters, Phys. Rev. B 77, 104306, (2008)

[6] M.M. Koza, Phys. Rev. B 78, 064303, (2008)


Lattice dynamics of thermoelectric materials:

The direct conversion of waste heat into electrical power in thermoelectric devices is believed to contribute substantially to future power supply and sustainable energy management. A high value of the Seebeck coefficient (thermoelectric power) is an essential prerequisite for such applications. However, high efficiency of a thermoelectric device depends on the opportunity of minimizing the heat flow, i.e. the transport of thermal energy, within the thermoelectric material. The understanding of vibrational eigenstates, phonons, of materials and their interaction is one fundamental step towards a thorough comprehension of heat transport and its minimization in thermoelectric compounds.


Figure right:

The figure reports the generalized density of states of La- and Ce-filled M(1-x)Fe4Sb12 compounds measured at two different temperatures. For comparison, results from ab initio powder average lattice dynamics (PALD) calculations are shown


Further reading:

[1] R. Viennois, L. Girard, M.M. Koza, H. Mutka, D. Ravot, F. Terki, S. Charar, J.-C.Tedenac, Phys. Chem. Chem. Phys. 7, 1617, (2005)

[2] M.M. Koza, M.R. Johnson, R. Viennois, H. Mutka, L. Girard, D. Ravot, Nature Materials 7, 805, (2008)

[3] N.Melnychenko-Koblyuk, A.Grytsiv, L.Fornasari, H.Kaldarar, H.Michor, F.Rohrbacher, M.M.Koza, E.Royanian, E.Bauer, P.Rogl, M.Rotter, H.Schmid, F.Marabelli, A.Devishvili, M.Doerr, G.Giester, J. Phys.: Condens. Matter 19, 216223, (2007)

[4] M.M.Koza, L.Capogna, A.Leithe-Jasper, H.Rosner,W.Schnelle, H.Mutka, M.R.Johnson,C.Ritter, Yu.Grin, Phys. Rev. B 81, 174302, (2010)