Heat capacity and coherence measurements on Eu:Y2SiO5 at sub-Kelvin temperatures place an upper bound on TLS contributions and show constant linewidths from 300 mK to 2 K.
Levin, Internal thermal noise in the LIGO test masses: A direct approach, Phys
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From Heat Capacity to Coherence in Ultra-Narrow-Linewidth Solid-State Optical Emitters at Sub-Kelvin Temperatures
Heat capacity and coherence measurements on Eu:Y2SiO5 at sub-Kelvin temperatures place an upper bound on TLS contributions and show constant linewidths from 300 mK to 2 K.