6533b872fe1ef96bd12d2fa2

RESEARCH PRODUCT

Kapitza resistance of laser-annealed surfaces

Helmut KinderWerner DietscheHeitor C. BassoPaul Leiderer

subject

Materials scienceQuality (physics)Condensed matter physicschemistrylawPhononRuby laserInterfacial thermal resistancechemistry.chemical_elementddc:530LaserHeliumlaw.invention

description

Our understanding of the phonon processes at the interfaces between two media is still quite rudimentary. Particularly notorious is the helium-solid interface, where the accoustic impedances differ by a large amount. It is well known that the Kapitza resistance, i.e. the thermal boundary resistance between helium and a solid, is usually up to 100 times smaller than predicted by the acoustic theory as formulated by Khalatnikov [1]. However, it was shown by J. WEBER et al. [2] that there was no discrepancy at surfaces of freshly cleaved crystals, i.e. at surfaces of exceptional good quality. Thus it is clear that surface irregularities must be responsible for the anomalous Kapitza resistance. Little progress has been made, however, in the understanding of how these irregularities mediate the anomalously strong phonon transmission.