| Publication Type |
Journal Article |
| Title |
Pressure dependence of the high-frequency light scattering susceptibility of ortho-terphenyl: A mode coupling analysis |
| Authors |
A Patkowski Manuel L S Matos Lopes EW Fischer |
| Groups |
MTFT |
| Journal |
JOURNAL OF CHEMICAL PHYSICS |
| Year |
2003 |
| Month |
July |
| Volume |
119 |
| Number |
3 |
| Pages |
1579-1585 |
| Abstract |
The high frequency part of the depolarized light scattering susceptibility has been measured for ortho-terphenyl (OTP) in a broad temperature and pressure range and analyzed using the mode-coupling theory (MCT). We found that the time-temperature-pressure superposition does not work for OTP in the frequency range of the susceptibility minimum and both a and b exponents of the MCT are temperature and pressure dependent. The pressure induced shift of the position of the minimum is much weaker than that of the alpha-peak resulting in dT(c)/dP=8.5 K/kbar while dT(g)/dP=26 K/kbar. Thus any universal scaling of the entire susceptibility including both the alpha-peak and the MCT minimum is not possible. These results are in contradiction to the previously reported conclusions obtained from the analysis of incoherent neutron scattering data [A. Tolle , Phys. Rev. Lett. 80, 2374 (1998)]. (C) 2003 American Institute of Physics. |
| DOI |
http://dx.doi.org/10.1063/1.1581847 |
| ISBN |
|
| Publisher |
|
| Book Title |
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| ISSN |
0021-9606 |
| EISSN |
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| Conference Name |
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| Bibtex ID |
ISI:000183915100032 |
| Observations |
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