10 research outputs found
Superconductivity in CuxBi2Se3 and its implications for pairing in the undoped topological insulator
Bi2Se3 is one of a handful of known topological insulators. Here we show that
copper intercalation in the van der Waals gaps between the Bi2Se3 layers,
yielding an electron concentration of ~ 2 x 10^20cm-3, results in
superconductivity at 3.8 K in CuxBi2Se3 for x between 0.12 and 0.15. This
demonstrates that Cooper pairing is possible in Bi2Se3 at accessible
temperatures, with implications for study of the physics of topological
insulators and potential devices.Comment: 6 pages, 4 figure
(Table 1) Positions of the Mesocena elliptica zone in sediment cores from the Pacific and Indian Oceans
The Mesocena elliptica Ehr. zone in deep-sea sediments of the Pacific Ocean is characterized by a short vertical range at the base of the Pleistocene section. Depending on sedimentation rate this zone lies at various depths below the ocean bottom. M. elliptica is unknown in recent oceanic plankton. In fossil state known species indicate that sediments containing them are of Oligocene-Miocene age. New data obtained in early 1960's show that within a short interval, evidently in Early Pleistocene, M. elliptica was abundant in plankton, primarily in tropical regions. Correlation of paleomagnetic data with results of diatom analysis shows that the Mesocena elliptica zone always lies above the Pliocene-Pleistocene boundary, and that maximum contents of M. elliptica coincide with the Jaramillo event (0.85-0.95 million years ago)
(Figure 24) Stratigraphic distribution of leading diatom species in Miocene-Holocene deposits from the Black Sea
(Table 1) Positions of the Mesocena elliptica zone in sediment cores from the Pacific and Indian Oceans
The Mesocena elliptica Ehr. zone in deep-sea sediments of the Pacific Ocean is characterized by a short vertical range at the base of the Pleistocene section. Depending on sedimentation rate this zone lies at various depths below the ocean bottom. M. elliptica is unknown in recent oceanic plankton. In fossil state known species indicate that sediments containing them are of Oligocene-Miocene age. New data obtained in early 1960's show that within a short interval, evidently in Early Pleistocene, M. elliptica was abundant in plankton, primarily in tropical regions. Correlation of paleomagnetic data with results of diatom analysis shows that the Mesocena elliptica zone always lies above the Pliocene-Pleistocene boundary, and that maximum contents of M. elliptica coincide with the Jaramillo event (0.85-0.95 million years ago)
Lithology, biostratigraphy, and geochemistry of the Black Sea sediments, DSDP Leg 42 (pt. 2) data
The monograph presents results of deep-sea drilling in the Black Sea carried out in 1975. Detailed lithological, biostratigraphic and geochemical studies of Miocene-Holocene sediments have been carried out by specialists from institutes of the USSR Academy of Sciences, Moscow State University and other organizations. Drilling results are compared with geophysical data. Geological history of the Black Sea basin is considered as well