Publication Type
Journal
Journal Name
Chinese Journal of Physics
Publication Date
Page Numbers
369 to 374
Volume
49
Issue
1
Abstract
Ultrasonic attenuation measurements on phosphate glasses with different chain lengths,
lead metaphosphate and lead-indium phosphate, have been carried out at low temperatures
(0.3–10 K) and high frequencies (100–160 MHz). The materials investigated are lead
metaphosphate (average chain length > 15) and lead indium phosphate (average chain length
= 3). Both materials have the typical glasslike behavior, explained by the presence of tunneling
states (TS). A detailed analysis reveals that the density of states of these TS is
significantly lower in the lead metaphosphate glass compared to the lead indium glass. This
difference can be related to the difference in length of the phosphate tetrahedra chains.
