The galvanomagnetic properties of short-period superlattices

SnTe Phase Transition in Strained Superlattices PbTe/SnTe

“…The observation of superconductivity in PbTe/SnTe superlattices (SL) [1] and its subsequent investigation [2][3][4] attracted attention to their galvanomagnetic properties.…”

Superconductivity of Non-Strained PbTe-PbS and Strained PbTe-SnTe Superlattices

“…On the basis of the investigations the minimum period of the misfit dislocation grid dMD in the PbTe-SnTe system may be estimated to be 32 nm. In comparison with the PbTe-PbS system [2] having dMD = 5.2 nm, the regularity of the misfit dislocation grid in the PbTe-SnTe system is decreased because of the large distance between the dislocations, and consequently, weaker interactions between them. Moreover, the regularity of the misfit dislocation grid is limited by the dimensions and orientation of the blocks of the KCl substrate.…”

“…Mironov et al [2] have demonstrated that the superconductivity of the superlattices based on PbTe, PbSe and PbS is caused by a special structure of the interface, namely by a regular grid of misfit dislocations at the interface.…”

“…In contrast to the PbTe-SnTe superlattices, the superconductivity of the PbTe-PbS superlattices is found to be associated with regular misfit dislocation grids which are generated at the interfaces. Superconducting semiconductor superlattices having the critical temperature much higher than that of bulk semiconductors [1,2] are of special interest to those who are interested in the high temperature superconductivity models. Such materials as PbTe, PbSe and PbS are not superconductors, and SnTe is a superconductor at 0.22 K. Therefore, it may be supposed that the superconductivity of the superlattices made of those materials is connected with some pecular electron *This work is supported in part by Project N62-064 P.P.…”

“…For our experiments two series of strained and partially strained PbTe-SnTe superlattices with different periods have been grown on a PbS buffer layer and on (001) cleaved KCl substrates by vacuum deposition. Periodicity of these superlattices has been evaluated from the presence of the satellites on the X-ray diffractograms [3]. The first series consists of superlattices with thick and thereby unstrained PbTe layers and thin stretched SnTe layers.…”