Volume 39, Number 5, September I 1997
|Page(s)||509 - 514|
|Section||Condensed matter: structure, thermal and mechanical properties|
|Published online||01 September 2002|
A direct observation of tunnelling states in molecular solids with random internal strains
Solid State Physics Division, Bhabha Atomic Research Center,
Mumbai 400 085, India
2 Department of Chemistry, Osaka University, Toyonaka, Osaka 560, Japan
3 ISIS Pulsed Neutron Facility, Rutherford Appleton Laboratory, Chilton, Didcot, Oxon, OX11 0QX, UK
Accepted: 21 July 1997
Inelastic-neutron-scattering experiments on ternary salts for x = 0.0, 0.05, 0.1 and 0.5 have been carried out at 4 K. The gradual buildup of intensity in the range 0 to 0.6 meV with increasing values of x suggest that, beyond a certain value of x, these systems might show a low-temperature two-level system behaviour and that the tunnelling defects responsible for this might well be the ions present in them. This has been confirmed by specific-heat measurements down to 0.7 K on the maximally strained () system.
PACS: 61.12.Yp – Other neutron diffraction and scattering techniques for structure analysis / 65.40.+g – Heat capacities of solids / 63.50.+x – Vibrational states in disordered systems
© EDP Sciences, 1997
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