| Issue |
Europhys. Lett.
Volume 39, Number 5, September I 1997
|
|
|---|---|---|
| Page(s) | 509 - 514 | |
| Section | Condensed matter: structure, thermal and mechanical properties | |
| DOI | https://doi.org/10.1209/epl/i1997-00385-6 | |
| Published online | 01 September 2002 | |
A direct observation of tunnelling states in molecular solids with random internal strains
1
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
Received:
12
May
1997
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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