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  • 1
    Electronic Resource
    Electronic Resource
    The superconductivity and structure of equiatomic ternary transition metal pnictides (1983)
    Springer
    Applied physics 31 (1983), S. 201-212 
    Details
    ISSN: 1432-0630
    Keywords: 74 ; 81
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract Recent superconductivity and crystallographic data for the MM′X ternary compounds with M = Ti, Zr, or Hf, M′ = Ru or Os, and X = P or As are presented. Moderate to high superconducting transition temperatures (T c 's)are exhibited by the ZrRuSi-type hexagonal phase which is found to be metastable at low temperatures. The low-temperature phase of ZrRuP has the TiNiSi-type orthorhombic structure and exhibits superconductivity at 3.9K. The low-temperature phase of HfRuAs has the TiFeSi-type orthorhombic superstructure and remains normal at 1.0K. TiRuAs exists only with the superstructure and remains normal at 0.35K. The details of these various structural modifications point to the importance of undistorted zig-zag chains of metal atoms for the occurrence of superconductivity in these compounds. The lowT c for TiRuP and the absence of superconductivity for TiOsP above 0.35K are not accounted for by these structural modifications.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00614955
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  • 2
    Electronic Resource
    Electronic Resource
    Specific heat and critical field for some iron-containing superconductors (1985)
    Springer
    Journal of low temperature physics 59 (1985), S. 237-245 
    Details
    ISSN: 1573-7357
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Specific heat measurements on superconductingLu 2 Fe 3 Si 5 reveal a strong sample dependence of the residual specific heat contribution γ s , belowT c , effectively ruling out the possibility of a two-band model. Upper critical fieldH c2 results for Lu2Fe3Si5, Sc2Fe3Si5, and LaFe4P12 show a very largeH c2 with an unusual temperature dependence for Lu2Fe3Si5, in contrast to the latter two compounds, implying a strongly sample-dependentH c2 as well. Intrinsic magnetic impurities arising from structural disorder and defects are possibly the origin of these anomalous superconducting state properties of Lu2Fe3Si5.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00683777
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  • 3
    Electronic Resource
    Electronic Resource
    μSR studies in the heavy fermion systems UNi2Al3, UPd2Al3 and U2PtC2 (1994)
    Springer
    Hyperfine interactions 85 (1994), S. 425-430 
    Details
    ISSN: 1572-9540
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We have performed Muon Spin Relaxation (μSR) measurements of several heavy fermion systems: UNi2Al3 (single crystal), UPd2Al3 (single crystal) and U2PtC2 (polycrystal). ZF -μSR measurements of UNi2Al3 show magnetic order below the Néel temperatureT N=4.6K, with the muon precession frequencyν(T → 0)=2.5MHz at low temperatures. The local field distribution obtained at low temperatures in UNi2Al3 resembles that of the incommensurate spin density wave (SDW) system (TMTSF)2PF6, suggesting an incommensurate spin arrangement in UNi2Al3. TF -μSR measurements give the penetration depthλ(T → 0)=6100Å for UPd2Al3 andλ(T→ 0)=7000Å for U2PtC2 respectively. Since UPd2Al3 and U2PtC2 are clean superconductors (ζ/l-0), we can combineσ∝ n s/m* with the Sommerfeld constantγ ∝ n s 1/3 m* to calculate the Fermi temperatureT F ∝ σ3/4γ−1/4, which represents the characteristic energy scale of the superconducting carriers. We obtainT C/TF ≈ 0.01 for both UPd2Al3 and U2PtC2, comparable to other exotic superconductors, but quite different from simple metal BCS superconductors, whereT C/TF ≤ 0.01.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02069454
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  • 4
    Electronic Resource
    Electronic Resource
    Phonon anomalies in ZrRuP? (1984)
    Springer
    Journal of low temperature physics 55 (1984), S. 11-15 
    Details
    ISSN: 1573-7357
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The specific heat of a new orthorhombic structure modification of ZrRuP has been measured. The superconducting transition temperatureT c of this new phase, 3.76 K, is concluded to be much lower than that of the hexagonal modification (T c =13.0 K) due to the 30% stiffer lattice of the orthorhombic phase as determined by the Debye temperature. The high- and low-T c phases of ZrRuP are found to have nearly identical densities of states at the Fermi energy.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00683648
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  • 5
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    The superconductivity and structure of equiatomic ternary transition metal pnictides (1983)
    Springer
    Details
    Publication Date: 1983-08-01
    Print ISSN: 0947-8396
    Electronic ISSN: 1432-0630
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Published by Springer
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