Determination of the energy gap of superconducting Chevrel and A15 compounds from heat capacity measurements

Two-gap superconductivity in Ag1–xMo6S8Chevrel phase

“…As one can see from figure 7 equation ( 4) acceptably describes the c el of Ag 1−x Mo 6 S 8 . A slight deviation is observed only between 1 and 2 K. However, both characteristic parameters A = 8.6 (1) and ∆(0)/k B T c = 1.55 (2) obtained from such a fit are smaller, than the theoretically predicted as well as the gap ratios ∆(0)/k B T c = 1.8-2.4 reported for Ag 1−x Mo 6 S 8 in [16,17]. Taking into account this finding and the fact that isostructural SnMo 6 S 8 and PbMo 6 S 8 CPs [9] are reported to be multiband superconductors we tried to describe the c el of Ag 1−x Mo 6 S 8 by a two-gap model.…”

“…The measurements of magnetic susceptibility and electrical resistivity showed Ag-containing CP to be a metal and a Pauli-paramagnet [2,6]. Extensive studies of the specific heat capacity of AgMo 6 S 8 at low temperatures were performed in [16] and [17]. Both reports reveal a complex phononic part of the low temperature specific heat which is due to a 'rattling effect'.…”

Machine Learning Guided Synthesis of Multinary Chevrel Phase Chalcogenides

“…Sixty-seven of the CPs in our data set (Table S4) have been synthesized previously with a range of synthesis techniques. ,− ,,,− These techniques can be classified as three general approaches, each used in a different temperature range: (a) direct high-temperature ( T > 1000 C) synthesis from stoichiometric mixtures of the constituent elements and/or non-CP binaries (e.g., MoX 2 ); (b) medium-temperature ( T ≈ 500 C) intercalation (MTI) of elemental M into Mo 6 X 8 ; or (c) room-temperature intercalation of the dissolved cation M into Mo 6 X 8 . The large temperature differences between these different techniques indicate a wide range of stabilities of observed CPs.…”

Chemical Technology Division annual technical report, 1986

“…Few thermodynamic studies of (molybdenum + selenium) have been described. The molar heat capacities of Mo 6 Se 8 below 30 K 42,43 and MoSe 2 to 350 K 44 have been reported. Studies of the vaporization of the molybdenum diselenide phase have been described by Glazunov et al 45 and by Viksman and Gordienko.…”

“…In 1986, we completed a cost analysis of the tokamak power systems (TPSS) reactor plant. 43 This reactor design incorporates several innovative concepts: a high plasma beta value (which requires lower magnetic fields), a high-temperature lithium/vanadium breeder blanket, a high-temperature heat transport zone, a zoned reactor building, and simple maintenance scenarios. We compared the capital cost and the bus-bar cost of electricity for TPSS to costs estimated for an older fusion reactor design, STARFIRE, 44 and a design derived using a liquid-metal breeder blanket included in the Blanket Comparison and Selection Study (BCSS).…”