| 摘要 |
A versatile method of phonon spectroscopy in which frequency crossing effects are utilized. A heat current is passed through a composite structure incorporating two bodies respectively containing different types of resonant phonon-scattering center. A varying external perturbation, suitably a magnetic field, is applied to the structure so as to affect the resonant frequency for only one of these types. The temperature difference between two points on the structure is monitored as the perturbation varies, this temperature difference exhibiting an excursion when the resonant frequencies for the two types of center coincide.
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