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  • 21
    Electronic Resource
    Electronic Resource
    Neutron scattering study of Cs"2CoCl"4: A system of 1D, S=12 XY antiferromagnetic chains with spin frustration
    Amsterdam : Elsevier
    Journal of Magnetism and Magnetic Materials 31-34 (1983), S. 1137-1138 
    Details
    ISSN: 0304-8853
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Physics
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0304-8853(83)90831-4
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  • 22
    Electronic Resource
    Electronic Resource
    Magnetic properties and phase diagram of Ni"xMn"1"-"xTiO"3
    Amsterdam : Elsevier
    Journal of Magnetism and Magnetic Materials 104-107 (1992), S. 1637-1638 
    Details
    ISSN: 0304-8853
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Physics
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0304-8853(92)91489-G
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  • 23
    Electronic Resource
    Electronic Resource
    First-order magnetic transition in CoI"2
    Amsterdam : Elsevier
    Journal of Magnetism and Magnetic Materials 104-107 (1992), S. 859-860 
    Details
    ISSN: 0304-8853
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Physics
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0304-8853(92)90395-5
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  • 24
    Electronic Resource
    Electronic Resource
    Observation of condensation of magnons in quasi-2D, planar ferromagnet K"2CuF"4
    Amsterdam : Elsevier
    Journal of Magnetism and Magnetic Materials 15-18 (1980), S. 417-418 
    Details
    ISSN: 0304-8853
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Physics
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0304-8853(80)91112-9
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  • 25
    Electronic Resource
    Electronic Resource
    Magnetic ordering in delafossite CuFeO"2
    Amsterdam : Elsevier
    Journal of Magnetism and Magnetic Materials 104-107 (1992), S. 823-824 
    Details
    ISSN: 0304-8853
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Physics
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0304-8853(92)90377-Z
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  • 26
    Electronic Resource
    Electronic Resource
    The effects of random fields on the critical and bicritical behavior of Mn x Zn1−x F2 (1989)
    Springer
    The European physical journal 75 (1989), S. 303-321 
    Details
    ISSN: 1434-6036
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We have carried out a comprehensive study of the static and dynamic spin-spin correlations of Mn x Zn1−x F2 in a magnetic field. Samples withx=0.75 andx=0.5 have been studied. This system exhibits behavior closely related, if not identical, to that of the Random Field Ising Model (RFIM). An additional feature of Mn x Zn1−x F2 is that it exhibits an easily accessible bicritical point; thus one can study the changeover from the RFIM to the uniformXY model with a transverse random field. Quite generally, the instantaneous spin-spin correlations in a field are described by a combination of Lorentzian, Lorentzian-squared and delta function terms the latter corresponds to the long range order (LRO) component. In the Ising phase one finds history dependent behavior as discussed previously. In theXY phase, except very near the spin-flop boundary, one finds ergodic behavior withXY LRO and Lorentzian squared Ising fluctuations. Rather complicated instability effects are found all along the spin-flop boundary. Further, when one establishes LRO in theXY phase and lowers the field through the spin-flop value, one obtains a LRO Ising state in thex=0.75 sample whereas one obtains the field-cooled domain state in thex=0.50 sample. This dramatic difference in behavior is not understood. Our results on the RFIM aspects of the problem are consistent with our previous studies. The transition is dominated by the metastability effects with an underlying equilibrium transition which is either first order or weakly second order (β≈0). The underlying transition manifests itself directly in measurements of the dynamic response nearT N (H). From the data above the metastability boundary we deduce for the static correlation length exponentv=1.4±0.3 in good agreement with theory. We find for the RFIM crossover exponent φRF=1.5±0.2 where the errors represent the spread in values obtained from different techniques. Finally, we have determined in detail the field-temperature phase diagram of thex=0.5 sample including the critical behavior along the spin-flop line; the latter transition appears to be second order for an extended region.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01321818
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  • 27
    Electronic Resource
    Electronic Resource
    Random field effects in the three dimensional Ising magnet: Fe x Zn1−x F2 (1984)
    Springer
    The European physical journal 58 (1984), S. 15-30 
    Details
    ISSN: 1434-6036
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We have carried out a comprehensive neutron scattering study of random field effects in the diluted three dimensional Ising antiferromagnet Fe x Zn1−x F2 withx=0.35 and 0.5. Emphasis is on the global trands from the small to the large random field regimes. It is found, as in previous experiments, that when the system is cooled in a field it evolves from the high temperature paramagnetic state to a low temperature domain wall state. The low temperature peaks are well-described by Lorentzian squared profiles although for thex=0.5 sample extinction made the measurements difficult. In both samples, the results show that in the field-cooled state the correlation length varies asH −v withv=2.2±0.1. In thex=0.35 sample this power law holds over a length scale varying from 2 to 1500 lattice constants. At low fields pretransitional behavior similar to that observed previously in Fe0.6Zn0.4F2 is found. AtT N (H=0) it is found that the correlation length also scales algebraically withH but withv=0.86±0.04. Pronounced history-dependent effects are observed below the phase boundary determined by the peak in the critical scattering. For example, on cooling in zero-field, raising the field and then warming, long range order survives up to the phase boundary; at this point it appears to convert abruptly into the finite correlation length field cooled state although elucidation of the explicit nature of this transition is complicated by rounding due to a concentration gradient. These results are discussed in the context of recent theories incorporating metastability effects as well as recent experiments.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01469433
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  • 28
    Electronic Resource
    Electronic Resource
    Phase transitions in diluted magnets: Critical behavior, percolation, and random fields (1984)
    Springer
    Journal of statistical physics 34 (1984), S. 817-848 
    Details
    ISSN: 1572-9613
    Keywords: Critical phenomena ; neutron scattering ; random interactions ; antiferromagnets ; percolation and random fields
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Transition metal halides provide realizations of Ising,XY, and Heisenberg antiferromagnets in one, two, and three dimensions. The interactions, which are of short range, are generally well understood. By dilution with nonmagnetic species such as Zn++ or Mg++ one is able to prepare site-random alloys which correspond to random systems of particular interest in statistical mechanics. By mixing two magnetic ions such as Fe++ and Co++ one can produce magnetic crystals with competing interactions-either in the form of competing anisotropies or competing ferromagnetic and antiferromagnetic interactions. In this paper the results of a series of neutron scattering experiments on these systems carried out at Brookhaven over the past several years are briefly reviewed. First the critical behavior in Rb2Mn0.5Ni0.5F4 and FecZn1−cF2 which correspond to two-dimensional and three-dimensional random Ising systems, respectively, are discussed. Percolation phenomena have been studied in Rb2MncMgl−cF4, Rb2CocMgl−cF4, KMncZl-cF3, and MncZnl−cF2 which correspond to two-and three-dimensional Heisenberg and Ising models, respectively. In these casesc is chosen to be in the neighborhood of the nearest-neighbor percolation concentration. Application of a uniform field to the above systems generates a random staggered magnetic field; this has facilitated a systematic study of the random field problem. As we shall discuss in detail, a variety of novel, unexpected phenomena have been observed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01009443
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  • 29
    Electronic Resource
    Electronic Resource
    Phonon anomalies in YNi2 11B2C (1996)
    Springer
    Journal of low temperature physics 105 (1996), S. 1635-1640 
    Details
    ISSN: 1573-7357
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Recently we have discovered a new peak with phonon character which appears only below Tc in an intermetallic superconductor, YNi2 11B2C (Tc∼14-2K) by neutron inelastic scattering measurements. The peak intensity of the new peak shows the order-parameter-like temperature dependence of the superconductivity. The new peak grows by absorbing the spectral weight from the above-lying soft phonon mode. In the present study we investigate the magnetic field dependence of the new peak. With increasing magnetic field, the new peak is gradually suppressed and disappears by H=Hc2 (∼4.7T at T=5.5K). Beyond Hc2, the profile of the scattering function recovers that of the non-superconducting state above Tc These results strongly indicate that this new peak is undoubtedly associated with the superconducting state in YNi2 11B2C.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00753934
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  • 30
    Electronic Resource
    Electronic Resource
    Microstructural and dimensional stabilities of a potential γ/γ′-α(Mo) directionally solidified eutectic superalloy under cyclic thermal exposure to 1000° C (1982)
    Springer
    Journal of materials science 17 (1982), S. 3484-3490 
    Details
    ISSN: 1573-4803
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract A potential heat-resistant ductile eutectic composite,γ/γ′-α, in the Ni-Al-Mo ternary system has been thermally cycled in the temperature range 200 to 1000° C for up to 1000 cycles in an attempt to examine dimensional as well as microstructural stability of the composite under thermal fatigue conditions. The composite examined has two types of initial microstructure; in one, blocky γ′-Ni3Al encircles individualα-Mo fibres (as-grown condition) whereas in the other,γ′ is in the form of fine cuboidal particles uniformly distributed in an Ni-rich fccγ matrix (heat-treated condition). Dilatometric measurements upon temperature cycling show that the composite is stable against “thermal ratchetting” irrespective of initial microstructural conditions. However, the cycling induces microstructural change, which is characterized by segmentation ofα-Mo fibres or formation of a detrimental brittle phase identified as an intermetallicδ-NiMo that consumesα-Mo fibres whether the fibres are encircled byγ′ or not. Post-cycling tensile tests at room temperature show that the fibre damage in the former has no fatal effect on tensile strength and ductility. A beneficial effect of theα-encirclingγ′ configuration is discussed on the basis of the recognition of a peritecto-eutectoid reaction:α+γ→δ+γ′ that has been disregarded.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00752193
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