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  • 1
    Electronic Resource
    Electronic Resource
    Ferromagnetism in carbon-doped Mn5Si3 films (2000)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 87 (2000), S. 6013-6015 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The effect of carbon doping on the structural and magnetic properties of Mn5Si3Cx films is investigated for different substrate temperatures TS and concentrations x. Samples with x(approximate)0.75 prepared at TS=650–750 K exhibit ferromagnetic order with enhanced ordering temperatures TC well above room temperature in contrast to the undoped antiferromagnetic Mn5Si3 compound. Structural analysis shows that C is incorporated interstitially in the hexagonal Mn5Si3-type structure with a lattice expansion with respect to the undoped compound. The enhanced ferromagnetic order is presumably not simply due to a change of the interatomic Mn–Mn distances but due to a change of the electronic structure and/or exchange interactions. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.372597
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  • 2
    Electronic Resource
    Electronic Resource
    Ferromagnetism above room temperature in Mn–Si–C alloy films (1996)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 68 (1996), S. 3189-3190 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Mn–Si–C alloy films are prepared by e-beam coevaporation onto a Si substrate held at 600 °C. Ferromagnetism is observed below Tc=(360±5) K with SQUID magnetometry and magneto-optical Kerr effect. This is the highest Curie temperature Tc yet observed for a Mn-based alloy. Although the composition determined by Auger depth profiling varies appreciably for different films, their Tc is the same indicating that ferromagnetism is caused by an alloy of well-defined composition independent of precipitations. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.115820
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  • 3
    Electronic Resource
    Electronic Resource
    Coexistence of superconductivity and ferromagnetism in the d -band metal ZrZn 2 (2001)
    [s.l.] : Macmillian Magazines Ltd.
    Nature 412 (2001), S. 58-61 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] It has generally been believed that, within the context of the Bardeen–Cooper–Schrieffer (BCS) theory of superconductivity, the conduction electrons in a metal cannot be both ferromagnetically ordered and superconducting. Even when the superconductivity has been interpreted as ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/35083531
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  • 4
    Electronic Resource
    Electronic Resource
    Structure and electrical resistivity of the heavy fermion compound CeCu5Au (1993)
    Copenhagen : International Union of Crystallography (IUCr)
    Acta crystallographica 49 (1993), S. 936-941 
    Details
    ISSN: 1600-5740
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0108768193005233
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  • 5
    Electronic Resource
    Electronic Resource
    Low-temperature properties of amorphous (Mo1−x Ru x )0.8P0.2 alloys (1988)
    Springer
    The European physical journal 70 (1988), S. 361-369 
    Details
    ISSN: 1434-6036
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Amorphous (Mo1−x Ru x )0.8P0.2 alloys (0.3≤x≤0.7) have been investigated with measurements of the specific heatC and thermal conductivity κ. Also the superconducting properties (critical temperatureT c and upper critical field) have been determined. Well belowT c , all alloys show the familiar behavior known for glasses, i.e.C∼T n and κ∼T m withn≈1 andm≈2 which is attributed to tunneling states (TLS). The largeT c allows an unambiguous determination of the coefficients ofC and κ. Compairing our data with literature data, we find no correlation between the TLS density of states and the glass temperature or crystallization temperature, as opposed to insulating glasses where such a correlation appears to exist. The unusual annealing behavior found previously in amorphous Zr−Ni and Zr−Cu, which was attributed to a change in the TLS relaxation-time spectrum, is confirmed in the present work.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01317243
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  • 6
    Electronic Resource
    Electronic Resource
    Heavy-fermion behavior and spin-glass freezing in Si-stabilized amorphous alloys based on UPt3 (1992)
    Springer
    The European physical journal 89 (1992), S. 161-167 
    Details
    ISSN: 1434-6036
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract U-Pt-Si and U-(Pt, Pd)-Si alloys have been prepared in the amorphous state by splat-cooling. The average nearest-neighbor distance is the same as the U-Pt distance in UPt3. The low-temperature behavior of these alloys (with composition (U0.25Pt0.75)1−xSix, x=0.18, 0.20, 0.25; and (U0.25(Pt1−yPdy)0.75 0.8Si0.2,y=0.05 and 0.1) has been studied by specific heatC, magnetization and resistivity measurements in the temperature range 1.5 K to 20 K and for magnetic fields up to 6 T. Some samples were investigated down to 0.1 K and the specific heat for one sample was measured in fields up to 22 T. With γ0 =C/T| T→0 between 0.25 and 0.35 J/moleUK2, the alloys can be classified as heavy-fermion materials. As opposed to UPt3, the alloys exhibit spin-glass behavior with a concomitant decrease of γ0. The magnetization exhibits typical spin-glass features (e.g., an irreversibility line). An inverse relationship between γ0 andT max (temperature ofC/T maximum which is proportional to the spin-glass freezing temperature), irrespective of the Pd content, is observed. The behavior can be qualitatively described by a coexistence of heavy-fermion behavior and spin-glass freezing.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01320932
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  • 7
    Electronic Resource
    Electronic Resource
    Specific heat of neutron-irradiated crystalline and of vapor-deposited amorphous silicon (1985)
    Springer
    Applied physics 36 (1985), S. 15-18 
    Details
    ISSN: 1432-0630
    Keywords: 65 ; 85
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract We report on specific-heat measurements (0.1 K〈T〈2K) of heavily neutron-irradiated (4.8×1019 and 3×1021 n0/cm2) and as-received Si single crystals and of an evaporated amorphous Si film. The sample irradiated with the higher dose contains 6% amorphous regions, the other remains crystalline. The magnitude of the specific heat increases with “amorphicity”. However, already in the crystalline sample the specific heat exceeds the Debye contribution. We attribute the excess specific heat to exchange-coupled dangling bonds located at defects in crystalline environments and — for the amorphous sample — to dangling bonds in the amorphous network.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00616454
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  • 8
    Electronic Resource
    Electronic Resource
    Partial order in the non-Fermi-liquid phase of MnSi (2004)
    [s.l.] : Macmillian Magazines Ltd.
    Nature 427 (2004), S. 227-231 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Only a few metallic phases have been identified in pure crystalline materials. These include normal, ferromagnetic and antiferromagnetic metals, systems with spin and charge density wave order, and superconductors. Fermi-liquid theory provides a basis for the description of all of these phases. ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/nature02232
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  • 9
    Electronic Resource
    Electronic Resource
    Preface (1996)
    Springer
    Journal of low temperature physics 105 (1996), S. 271-271 
    Details
    ISSN: 1573-7357
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00768400
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  • 10
    Electronic Resource
    Electronic Resource
    Low-Temperature Properties of CeTAl3 (T=Au, Cu, Pt) and CeAuGa3 (1999)
    Springer
    Journal of low temperature physics 115 (1999), S. 1-14 
    Details
    ISSN: 1573-7357
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Measurements of the magnetization, specific heat, and electrical resistivity on CeTAl 3 (T=Au, Cu, Pt) and CeAuGa 3 polycrystals are reported. For all alloys, magnetic order is found. In CeTAl 3 the antiferromagnetic ordering temperature TN increases from 1.5 K (T=Au) to 2.9 K (T=Cu) while spin-glass order is found at 0.8 K for T=Pt. This tendency resembles the nonmonotonic dependence of the ordering temperature on the hybridization between Ce moments and ligand atoms in terms of the Doniach picture. CeAuGa 3 (TN=2.4 K) behaves similarly to CeAuAl 3 , thus underscoring the dominant role of transition metal ligands in ternary Ce compounds.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1021838628126
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