Magnetic ordering in molybdenum sulphides alloyed with third group elements

Alekseevskiǐ, N. E.; Bazan, C.; Добровольский, Николай Михайлович; Nizhankowskii, V. I.; Tsebro, V. I.; Zakosarenko, V.

doi:10.1016/0375-9601(75)90774-4

Cited by 10 publications

(3 citation statements)

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“…is in agreement with the results obtained by an earlier investigation 2. The temperature dependence of the heat capacity in the normal state indicates the unusual character of the phonon spectrum, and corresponding to our recently communicated results, 1 the lattice contribution of the heat capacity could be described with a combination of a Debye and an Einstein function:CL : (1 --a)CDebye (OD) "4-afEinstein (OE) CplT vs. T 2 for MosSnGaxS6.…”

supporting

confidence: 83%

The heat capacity of ternary molybdenum sulfides. II. The heat capacity of Mo5SnGa x S6 (x < 0.3) at low temperatures

et al. 1978

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The heat capacity of MosSnGaxS6 was measured in the temperature range from 2 K to 25K with x= 0.0, 0. 18, 0.22, and 0.25. Independent of the x-value a peak appears in the phonon spectrum of all investigated compounds at low frequencies. Similar to the increase of T with the Ga concentration, a rise of the ~, coefficient of the electronic heat capacity was observed, probably as a consequence of both the increase of the electronphonon interaction parameter and the density of states at the Fermi level.

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supporting

confidence: 83%

The heat capacity of ternary molybdenum sulfides. II. The heat capacity of Mo5SnGa x S6 (x < 0.3) at low temperatures

et al. 1978

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“…16,17) However, Ginzburg point out possibility which those multilayer films are exiciton-type superconductors.…”

Section: -2)mentioning

confidence: 99%

“…14,15) It is assumed there that the superconductivity is due to the metallic phase of semiconductor. 16,17) However, Ginzburg point out possibility which those multilayer films are exiciton-type superconductors. 13) In this work, we have synthesized Sn/Si core-shell cluster assemblies and investigated their structures and electrical properties.…”

mentioning

confidence: 99%

Possibility of Exciton Mediated Superconductivity in Nano-Sized Sn/Si Core–Shell Clusters: A Process Technology towards Heterogeneous Material in Nano-Scale

Kurokawa

Hihara

Ichinose

et al. 2012

Jpn. J. Appl. Phys.

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We have produced Sn/Si core-shell cluster assemblies by a plasma-gas-condensation cluster beam deposition apparatus. For the sample with Si content = 12 at.%, the temperature dependence of electrical resistivity exhibits a metallic behavior above 10K and the onset of superconducting transition below 6.1 K. With decreasing temperature, the thermomagnetic curve for the sample with Si content = 8 at.% begins to decrease steadily toward negative value below 7.7 K, indicating the Meissner effect. An 2 increase in the transition temperature, T C is attributable to exciton-type superconductivity. 3Assembling of clusters is a promising approach to produce nanostructurecontrolled-materials because their sizes are comparable to the elemental units of material properties. Several experimental techniques have been applied to prepare nano-sized clusters. 1-2)A plasma-gas-condensation cluster beam deposition (PGCCD) apparatus, [3][4][5][6] which is a combination of sputtering vaporization and inert gas condensation, is one of the promising candidates for this purpose. It is versatile to vaporize transition metals and refractive elements, and able to control the cluster size by adjusting the sputter yield, the gas pressure, and the volume of the cluster growth region. Using the PGCCD apparatus, we have succeeded in producing Co-or Fe-core/Si-shell, Fe-core/Al-shell, and Co-core/CoO-shell clusters assemblies, [7][8][9][10] in which the core parts are thermally and chemically stable, semiconducting and tunneling conductivities are observed.In this study, we have tried to make an exciton-type superconductor with the Sn/Si core-shell cluster assemblies. Ginzburg suggested that T C of exciton-type superconductors are higher than those of conventional phonon-type superconductors. 11,12) Superconducting granules embedded in dielectric and/or semiconducting matrices, 13) and a sandwich structure consisting of alternate layers of metal and semiconductor have been proposed to be exciton-type superconductors, 12) in which electron-pairing force, i.e., exciton attraction, 4 is mediated by virtual exciton in the semiconductor layers 12) . Indeed, superconductivity has been observed in Au/Ge and Au/Si multilayer systems.14,15)It is assumed there that the superconductivity is due to the metallic phase of semiconductor. 16,17) However, Ginzburg point out possibility which those multilayer films are exiciton-type superconductors. 13)In this work, we have synthesized Sn/Si core-shell cluster assemblies and investigated their structures and electrical properties. The Sn/Si core-shell cluster assemblies were first prepared by the PGCCD apparatus. The apparatus is composed of three main parts: a sputtering chamber, a cluster growth room, and a deposition chamber. According to the TEM observations, the average thickness of the Si shells on the Sn cores does not vary when the Si content changes from 3 to 37 at.%. It is plausible that the Si vapor condenses to the primary particles of about 2 nm in diameter. They are assembled on the Sn cores to for...

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Flükiger¹,

Wolf²

O (Without Cuprates) - Sc

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Magnetic ordering in molybdenum sulphides alloyed with third group elements

Cited by 10 publications

References 2 publications

The heat capacity of ternary molybdenum sulfides. II. The heat capacity of Mo5SnGa x S6 (x < 0.3) at low temperatures

The heat capacity of ternary molybdenum sulfides. II. The heat capacity of Mo5SnGa x S6 (x < 0.3) at low temperatures

Possibility of Exciton Mediated Superconductivity in Nano-Sized Sn/Si Core–Shell Clusters: A Process Technology towards Heterogeneous Material in Nano-Scale

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