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  • 1
    Electronic Resource
    Electronic Resource
    Doping and pressure studies on YbBiPt : 37th Annual conference on magnetism and magnetic materials (1993)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 73 (1993), S. 5415-5417 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The compound YbBiPt exhibits an extremely large low-temperature C/T (γ∼8 J K−2 mol−1/Yb) which, if due solely to a renormalized effective mass, would make this material the heaviest correlated electron system known to date. In the Kondo model, the very large γ corresponds to a small characteristic energy scale that is expected to be pressure dependent. We have studied the effect of chemical pressure on YbBiPt single crystals by heat-capacity measurements on Y and Lu-doped samples. We have also made preliminary low-temperature measurements under hydrostatic pressure of the heat capacity (300 mK≤T≤2 K, up to 8 kbar) and resistance (30 mK≤T≤1 K, at 16 kbar).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.353700
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  • 2
    Electronic Resource
    Electronic Resource
    On the Preparation of Platinum Black with a Clean Surface. Preliminary Heats of Adsorption of Hydrogen (1960)
    s.l. : American Chemical Society
    Journal of the American Chemical Society 82 (1960), S. 1055-1057 
    Details
    ISSN: 1520-5126
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ja01490a009
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  • 3
    Electronic Resource
    Electronic Resource
    Anomalous percolation-threshold behavior in the spin-glass-like, heavy fermion system (Ce,Gd)Al3 (abstract) (1987)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 61 (1987), S. 4104-4104 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Low-field susceptibility measurements show that Ce1−xGdxAl3 exhibits spin-glass-like behavior over nearly the entire concentration range. The temperatures of the spin-glass-like transition Tm(x) are surprisingly high [Tm(0.635)=125 K] considering that none of the rare-earth trialuminides order above 25 K. The Ce is necessary for the anomalous behavior since it is absent in (La, Gd)Al3. For x≤0.23, T≤5 K there is an interplay between the heavy-fermion and spin-glass-like behavior. The values of Tm would probably not be so large if the system were not a heavy-fermion system. On the other hand, the spin-glass-like transition appears to modify the heavy-fermion character of the specific heat. The large C/T values at low temperatures (410 mJ/mole K2 for x=0.26) probably would have been still larger if they were not reduced by the effective field of the spin-glass-like state. The low-field susceptibility measurements show spin-glass-like cusp anomalies for x=0.08, 0.15, 0.18, 0.20, 0.23, 0.34, 0.40, 0.635, 0.77, and 0.9. This anomaly in the susceptibility at Tm persists as one increases x through the antiferromagnetic percolation threshold at x≡xc ∼0.5. However, the magnitude of the susceptibility anomaly decreases two orders of magnitude as one increases x from 0.5 to 0.635. The resistivity in most respects resembles that of a dense Kondo system. It differs in that for x〉xc there is an additional amomaly in the resistivity at Tm, which is absent for x≤xc. The presence of this anomaly shows that the range of the order below Tm becomes at least as long as the mean free path for x〉xc. For x〉xc there are two transition observed in the susceptibility, the spin-glass-like transition at Tm and an antiferromagnetic transition at low temperatures. Specific heat measurements also show the antiferromagnetic transition.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.338543
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  • 4
    Electronic Resource
    Electronic Resource
    Temperature dependence of the specific heat and entropy of CeAl3 (1987)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 61 (1987), S. 3177-3179 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: It is thought that with decreasing temperature CeAl3 first condenses into a crystal-field JZ=±3/2 doublet ground state and then further condenses into a Kondo singlet state. To test this description, we use it to calculate the specific heat and entropy of CeAl3. We calculate the specific heat contribution of the JZ=±3/2 doublet using the resonant level model. The contributions from the JZ=±5/2 and ±1/2 doublets are computed using the known crystal-field energies but allowing for a broadening of the levels. If it is assumed that the excited crystal-field states have Lorentzian distributions with a width of the order of 50 K, the calculation is in generally good agreement with experimental data for the f-electron contribution. (The specific heat of LaAl3, which is reported here, was subtracted from the total to obtain the f-electron contribution.)
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.337832
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  • 5
    Electronic Resource
    Electronic Resource
    The Heat Capacity of and the Entropy Change in a Monolayer of Oxygen Chemisorbed on Platinum Black from 15 to 300°K.1a (1964)
    s.l. : American Chemical Society
    The @journal of physical chemistry 〈Washington, DC〉 68 (1964), S. 3240-3246 
    Details
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/j100793a027
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  • 6
    Electronic Resource
    Electronic Resource
    Kinetics of Reaction between Methane and Sulfur Vapor (1950)
    s.l. : American Chemical Society
    Industrial & engineering chemistry 42 (1950), S. 704-709 
    Details
    ISSN: 1520-5045
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ie50484a039
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  • 7
    Electronic Resource
    Electronic Resource
    SOME CHEMICAL AND STRUCTURAL EFFECTS ON THE PROPERTIES OF HIGH-Tc SUPERCONDUCTORS1 (1996)
    Palo Alto, Calif. : Annual Reviews
    Annual Review of Physical Chemistry 47 (1996), S. 283-325 
    Details
    ISSN: 0066-426X
    Source: Annual Reviews Electronic Back Volume Collection 1932-2001ff
    Topics: Chemistry and Pharmacology , Physics
    Notes: Abstract The history of superconductivity, including superconductivity in the high-Tc cuprates, is reviewed very briefly, and the differences between conventional superconductors and the high-Tc cuprates are summarized. The basic crystal structures of the major series of high-Tc cuprates are described and compared. The relation of structures to superconducting properties is reviewed with an emphasis on the orthorhombic-tetragonal transition in (La2-x Srx)CuO4; the corresponding transition, and also the transition to the low-temperature tetragonal phase in (La2-xBax)CuO4; and the effects of oxygen vacancies, oxygen-vacancy ordering, frozen-in disorder, and occupation of the off-chain O(5) sites in YBa2Cu3O7-delta. The effects of chemical substitutions of lanthanide elements on the La/Sr sites in (La2-xSrx)CuO4 and on the Y sites in YBa2Cu3O7-delta, and of 3d elements and sp elements on the Cu sites in both systems are reviewed. The difference between the effects of the lanthanide substitutions, particularly Pr, in the two systems are considered. Major properties of the Bi-, Tl-, and Hg-cuprates, are described briefly. A comparison of the high-Tc cuprates with noncuprate oxide superconductors is given.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1146/annurev.physchem.47.1.283
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  • 8
    Electronic Resource
    Electronic Resource
    Partial Molal Enthalpies of Adsorption of Hydrogen and Oxygen on Platinum and on Carbon-Supported Platinum (1964)
    s.l. : American Chemical Society
    Journal of the American Chemical Society 86 (1964), S. 2097-2101 
    Details
    ISSN: 1520-5126
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ja01065a001
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  • 9
    Electronic Resource
    Electronic Resource
    Vitamin Assay, Rapid Spectrophotometric Determination of Vitamin B12 in Microbial Material (1953)
    s.l. : American Chemical Society
    Journal of agricultural and food chemistry 1 (1953), S. 951-953 
    Details
    ISSN: 1520-5118
    Source: ACS Legacy Archives
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Process Engineering, Biotechnology, Nutrition Technology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/jf60015a007
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  • 10
    Electronic Resource
    Electronic Resource
    The magnetic field dependence of the specific heat of CeAl3 (abstract) (1985)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 57 (1985), S. 3175-3175 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Specific heat measurements have been performed on four polycrystalline samples of CeAl3 in the temperature range 0.32≤T≤20 K and in magnetic fields H up to 8 T. Though the samples were contaminated by 4–15% of CeAl2 and/or Ce3Al11, the specific heat of CeAl3 is so much larger than that of the other compounds below 1 K that their contribution to the specific heat can be neglected. Normalizing our data by the amount of CeAl3 that we estimated to be present, the specific heats for all four samples are in good qualitative agreement with one another for all T〈1 K and for all the magnetic fields investigated. In this temperature range the specific heat C decreases approximately linearly with increasing H for H〈8 T. It should be noted that Bredl et al. observed a more complex magnetic field dependence in their investigation of the specific heat of CeAl3. The slope of the decrease in C we observed with increasing H in the purest sample is approximately independent of T. In addition the ratio C/T is temperature dependent at low temperatures. All of these properties of the Kondo compound CeAl3 are different from what one would expect on the basis of a simple resonant level model (RLM). For example, RLM predicts that C should decrease with increasing H, but instead of a linear decrease it predicts that C should decrease as H2. A model, which incorporates crystal field effects as well as the Kondo effect, predicts the observed approximately linear magnetic field dependence of the specific heat and also the observed magnetization. In the model the component of the magnetization perpendicular to the c axis is computed by ignoring the Kondo effect and using only the effect of the crystal field splittings. The component of the magnetization parallel to the c axis is computed using RLM to treat the ground state J=±3/2 doublet but also includes contributions from the excited state J=±1/2, ±5/2 doublets which become important at higher fields. The magnetization is found by performing the appropriate average over angles that is required for polycrystalline samples. This magnetization is then used in a thermodynamic relationship for the magnetic field dependence of the specific heat. The generalized form of the RLM predicts the correct magnitude of the decrease in C in an applied field of 8 T.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.335140
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