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14
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2842607020
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edited by, M. Meissner, R. O. Pohl, Springer, New York
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(1993)
Phonon Scattering in Condensed Matter VII
, pp. 405
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Sergeev, A.V.1
Aksaev, E.E.2
Gogidze, I.G.3
Semenov, A.D.4
Gershenzon, E.M.5
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16
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84927301979
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Earlier measurements made using this general technique have been reported by D. A. Young, C. Thomsen, H. T. Grahn, H. J. Maris, and J. Tauc, in Proceedings of the 5th International Conference on Phonons Scattering in Condensed Matter, edited by A. C. Anderson and J. P. Wolfe (Springer, Berlin, 1986), p. 49; and R. J. Stoner, D. A. Young, H. J. Maris, J. Tauc, and H. T. Grahn, in Phonons '89, edited by S. Hunklinger, W. Ludwig, and G. H. Weiss (World Scientific, Singapore, 1990), p. 1305.
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18
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84927301978
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Debye temperatures were for the low-temperature limit. For the metals and diamond these were taken from Ref. 18. For sapphire FTHETAD was deduced from the low-temperature specific heat obtained from Ref. 18. For BaF2 FTHETAD was taken from Ref. 20. In all cases cD was deduced from FTHETAD. Mass densities were taken from Ref. 18 for the metals and diamond and from Ref. 20 for BaF2 and sapphire.
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22
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84927301976
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Meller Optics, Providence, Rhode Island.
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26
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84927301975
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The physical origin of this change is discussed at length in M. Cardona, Modulation Spectroscopy, Solid State Physics Suppl. (Academic, New York, 1969), Vol. 11.
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28
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11944263813
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(1990)
Phys. Rev. Lett.
, vol.64
, pp. 2172
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Brorson, S.D.1
Kazeroonian, A.2
Moodera, J.S.3
Face, D.W.4
Cheng, T.K.5
Ippen, E.P.6
Dresselhaus, M.S.7
Dresselhaus, G.8
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30
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84927301974
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This is because the diameter of the spot is large and so temperature gradients parallel to the substrate surface are small.
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31
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84927301973
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D. A. Young, Ph.D. thesis, Brown University, 1989 (unpublished).
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36
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84927301971
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Coherent Satori dye laser and Coherent Antares mode-locked Nd:Yag laser.
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39
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0016993516
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We expect our lattice dynamical theory to give the same Kapitza conductance at low temperatures as theories which treat the phonons as long-wavelength elastic waves. Therefore, we compared our results with the low-temperature calculations of J. D. N. Cheeke, H. Ettinger, and B. Hebral [, ] and found agreement in most cases to within a few percent at temperatures up to about 0.1FTHETAD of the metal.
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(1976)
Can. J. Phys.
, vol.54
, pp. 1749
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49
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84927301970
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The same argument applies if the dissipation is due to some other mechanism associated, for example, with defects in the diamond lattice.
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50
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24444432752
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The sample temperature was kept as low as possible during the film growth in order to minimize Bi-Pb interdiffusion. To confirm that the layers had not become intermixed during the evaporation of Pb we subsequently dissolved this layer in boiling methanol and found the Bi layer to be intact. G. M. Hood [, ] has studied diffusion in Pb as a function of the atomic radius rs of the diffusant. On the basis of his empirical law we do not expect Bi to diffuse rapidly in Pb at room temperature.
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(1981)
Phys. Rev. B
, vol.23
, pp. 4253
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51
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84927301969
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It was not possible to conduct experiments using Bi films as in the previous experiments since the thermal conductivity of Bi is small. This made the time needed for the film to come to thermal equilibrium after the laser pulse was absorbed unacceptably long.
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53
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0011062116
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Ultraviolet photoemission study of the initial adsorption of Pb on Si(100)2×1
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Pb binding to diamond has not to our knowledge been studied at a microscopic level. However, photoemission [, ] and STM [, 43, 7316, ] have been used to study the binding of Pb to Si. It has been clearly established that (for the Si orientations studied) Pb and Si do not react chemically, but form a surface dimer by ``dangling bond pairing of adjacent atoms in the topmost layer'' (Le Lay et al.). The adsorbed Pb atoms preferentially go into dimer bonds rather than sticking to one another, as indicated by the scarcity of three-dimensional Pb crystallites on the surface. This may indicate that the dimer bonds are stronger than the Pb-Pb bonds., E. Ganz, F. Xiong, I.-S. Hwang, J. Golovchenko, ibid.
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(1988)
Physical Review B
, vol.39
, pp. 3927
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Le Lay, G.1
Hricovini, K.2
Bonnet, J.E.3
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60
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84927301968
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This is not an unusually large value when compared to the potentials binding atoms in other metals.
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61
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84927301967
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Yu. A. Kosevich [in Phonons Scattering in Condensed Matter IIV (Ref. 13), p. 419] has proposed a theory (applicable at low temperatures where dispersion may be ignored) in which σK is shown to be increased if the atoms in the metal are bound to the dielectric by an attraction which extends more than a single monolayer from the metal surface. As in our theory the potential binding the interfacial atom must be quite strong. However, in Kosevich's theory the interfacial potential must be anharmonic. He finds the increased heat flow to be mainly due to modes of frequency less than ωmax.
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62
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84927301966
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To verify that we have not used an unrealistic amount of anharmonicity we evaluated the coefficient of thermal expansion of our two-dimensional lattice. This was done by determining the change in the mean area of a 50-atom by 50-atom Pb lattice with ε Pb - Pb = 930 K when the temperature was varied by a small amount near 300 K. We estimated a thermal expansion coefficient of 3.5 times 10-5 K-1 which compares favorably with the experimentally determined value (Ref. 18) for Pb of 2.8 times 10-5 K-1.
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64
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4243411010
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Absence of Anomalous Kapitza Conductance on Freshly Cleaved Surfaces
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Direct measurements of phonon transmission across interfaces between solids and liquid helium indicate that σK is not always anomalously large. For LiF cleaved in situ in liquid He, Weber et al. [, ] found the phonon transmission coefficient at 14 K to be substantially greater after the LiF surface ws exposed to air. Similar experiments performed much earlier [, R. C. Johnson, Bull. Am. Phys. Soc., 9, 713, ] using KCl did not show this effect, and therefore did not necessarily support the conclusion that the enhancement seen in the above experiment and in other experiments , 22, 257, N. S. Snyder, J. Low Temp. Phys.
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(1964)
Physical Review Letters
, vol.40
, pp. 1469
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Weber, J.1
Sandmann, W.2
Dietsche, W.3
Kinder, H.4
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65
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0016574253
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was due to interfacial contamination. The most recent experiments (Ref. 62) clearly show that the amount of interfacial contamination needed for a large change in σK is extremely small. This may explain the inconsistency of the earlier results.
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(1975)
Solid State Commun.
, vol.17
, pp. 1095
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Sabisky, E.S.1
Anderson, C.H.2
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67
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0019600020
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By drawing analogy with the theory of glasses, H. Kinder [, ] suggested that such modes could also arise as a consequence of disorder at the surface of a solid. He also discussed the effect of these modes on σK and considered the requirements for their coupling strength to phonons in the helium and the solid. The theory has since been developed further by H. Kinder and K. Weiss , J. Phys: Condens. Matter, 5, 2063
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(1981)
Physica B
, vol.107
, pp. 549
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