摘要:

The effect of roughness of the free surface of a semi-infinite isotropic solid on the low-temperature surface heat capacity is studied. The method of modified Green’s function (as compared with that used by Maradudin, Wallis, and Equiluz (1977) and perturbation theory are used for deriving an analytic expression for the contribution of weak roughness to the low-temperature surface heat capacity, which is a correction to the well-known result obtained by Dupuis, Mazo, and Onsager (1960) for the surface heat capacity of a semi-infinite isotropic solid with a plane free boundary. It is proved that the inclusion of roughness of isotropic crystals with optical surfaces increases the surface heat capacity in a wide temperature range (of the order of several kelvins). ©1998 American Institute of Physics.

ISSN:1063-777X    

DOI:10.1063/1.593602

出版商:AIP    

年代:1998

数据来源: AIP

摘要:

The anomalies in the optical exciton reflection spectra of crystals at low temperatures are interpreted. It is shown that the amplitude of the reflection minima increases upon an increase in damping. ©1998 American Institute of Physics.

ISSN:1063-777X    

DOI:10.1063/1.593603

出版商:AIP    

年代:1998

数据来源: AIP

摘要:

The measureddV/dI(V)curves of point contacts between the intermetallic compoundCeRu2in the superconducting state and the normal metal Cu correspond fairly well to the Blonder–Tinkham–Klapwijk model. It is used to obtain temperature and magnetic field dependence of the superconducting gap &Dgr;. The&Dgr;(T)dependence corresponds well to the BCS theory with2&Dgr;(0)/kBTc*=3.1±0.1.Additionally, a region of gapless superconductivity betweenTc*≃4.4−5.4 KandTcbulk≃6.2 Kis found. The gap decreases approximately linearly in a magnetic field and vanishes in a fieldBc*≃3.5 T,which is well below the upper critical fieldBc2≃6 Tand close to the irreversibility field. ©1998 American Institute of Physics.

ISSN:1063-777X    

DOI:10.1063/1.593604

出版商:AIP    

年代:1998

数据来源: AIP

摘要:

The heat transport through one-dimensional quantum wire is considered in the frameworks of the inhomogeneous Tomonaga–Luttinger liquid model. It is shown that even for perfect (impurity free) wire thermal transport is suppressed due to multiple scattering of plasmons on the boundaries that connect quantum wire to the leads of noninteracting electrons. In the presence of impurity inside the Luttinger liquid constriction resonant enhancement of thermal conductivity at certain conditions is predicted. ©1998 American Institute of Physics.

ISSN:1063-777X    

DOI:10.1063/1.593605

出版商:AIP    

年代:1998

数据来源: AIP