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Title: Phonon spectroscopy of the low-energy excitations in the solid solutions of yttrium–rare-earth metal–aluminum garnets

The transport characteristics of thermal-frequency phonons and the specific heat of a series of single crystals of yttrium–rare-earth metal–aluminum garnet solid solutions are studied at the helium temperatures. It is found that the existence of low-energy levels of various origins, which are responsible for an increase in the specific heat, retards phonon transport by one–three orders of magnitude. The temperature dependences of specific heat and the kinetic characteristics of phonons have a similar character.
Authors:
;  [1] ; ;  [2]
  1. Russian Academy of Sciences, Kotel’nikov Institute of Radio Engineering and Electronics (Russian Federation)
  2. St. Petersburg State University (Russian Federation)
Publication Date:
OSTI Identifier:
22472200
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Experimental and Theoretical Physics; Journal Volume: 121; Journal Issue: 1; Other Information: Copyright (c) 2015 Pleiades Publishing, Inc.; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; ALUMINATES; ENERGY LEVELS; EXCITATION; GARNETS; MONOCRYSTALS; PHONONS; RARE EARTH COMPOUNDS; SOLID SOLUTIONS; SPECIFIC HEAT; SPECTROSCOPY; TEMPERATURE DEPENDENCE; TEMPERATURE RANGE 0000-0013 K; YTTRIUM COMPOUNDS