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  • American Institute of Physics (AIP)  (9)
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  • 1
    Electronic Resource
    Electronic Resource
    Magnetization of Ce0.8La0.2Ru2Si2 single crystal under pressure (abstract) : 35th annual conference on magnetism and magnetic materials (1991)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 69 (1991), S. 5490-5490 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Magnetization measurements performed on a single crystal of Ce0.8La0.2Ru2Si2 with H parallel to the tetragonal c axis are reported. This alloy exhibits a long-range modulated order below 5.6 K. Below this temperature, anomalies are observed in both the M-vs-H curves at constant T and the M-vs-T curves at constant field. These anomalies agree with the multiphase (H,T) diagram recently determined by neutron experiments. On applying a hydrostatic pressure (P) a rapid decrease of TN is observed, in agreement also with neutron data, and the evolution of the (H,T) phase diagram can be determined. For P(approximately-greater-than)3 kbar, the M-vs-H curves measured above TN show an inflection (maximum of dM/dH at a field HM similar to that observed in the nonordered compound CeRu2Si2 and to those observed above TN in Ce1−xLaxRu2Si2 alloys containing a small concentration of La (x≤0.13). This effect is certainly related to the existence of short-range correlations. The variation of the value of M at HM with P (validity of the scaling previously observed for CeRu2Si2) is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.347975
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  • 2
    Electronic Resource
    Electronic Resource
    The superconducting phases of UPt3 under pressure (1990)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 67 (1990), S. 5200-5202 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The upper critical field Hc2(T) of the heavy fermion superconductor UPt3 for a magnetic field applied in the basal plane has been studied down to 150 mK and under hydrostatic pressure up to 10 kbar. The kink already observed in Hc2(T) at ambient pressure disappears by applying a relatively low pressure. This suggests that the high-temperature low-field superconducting phase reported recently is rapidly suppressed by pressure. A possible interpretation of these results is discussed in connection with recent theories.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.344661
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  • 3
    Electronic Resource
    Electronic Resource
    Thermal expansion at the metamagnetic transition in single-crystalline heavy-fermion (Ce,La)Ru2Si2 (1990)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 67 (1990), S. 5212-5214 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We present measurements of the volume expansion (αv) in magnetic fields up to 8.5 T and in the temperature range 1.3 K〈T〈20 K on the heavy-fermion compounds Ce1−xLaxRu2Si2 (x=0 and 0.05). In reduced scales the two compounds present the same low temperature Grüneisen coefficients. Emphasis is given on the strong field dependence of the low temperature extremum of αv. The validity of scaling law with pressure is verified. The interest to use a magnetic field to approach a magnetic instability is strongly underlined.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.344640
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  • 4
    Electronic Resource
    Electronic Resource
    Conductivity and magnetic properties of TmSe and TmS: Comparison to the dilute cases (1985)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 57 (1985), S. 3152-3153 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Magnetization, neutron diffraction, and resistivity measurements performed on the compounds TmSe and TmS are compared to those on the dilute alloys (Tm,Y)Se and (Tm,Y)S. In the paramagnetic regime, major differences exist between a regular array of Tm ions (TmSe and TmS) and the dilute systems. Localization (TmSe) or magnetic correlations (TmS) appear clearly in the conductivity behavior or in the dependence of the static susceptibility. A low content of Y atoms in TmSe has a drastic effect on the conductivity and on the magnetic order. We will discuss the connection between the degeneracy of the ground state with the opening of a gap.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.335187
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  • 5
    Electronic Resource
    Electronic Resource
    Transport and magnetic measurements on UPt3 (1985)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 57 (1985), S. 3082-3083 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Experiments on the normal phase of UPt3 show a large positive magnetoresistivity, almost temperature-independent, linear in field, and a positive thermoelectric power which is not linear in temperature as T→0. The superconducting phase is characterized by a high thermal conductivity with a strong T2 term, by a coherence length smaller than the mean free path, and by lower and upper critical fields H(0)c1∼60 Oe and Hc2(0)∼26 kOe.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.335166
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  • 6
    Electronic Resource
    Electronic Resource
    Single-crystal experiments on EuMo6S8 and EuMo5WS8 (1985)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 57 (1985), S. 3067-3069 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Resistivity measurements have been made on EuMo6S8 and EuMo5WS8 single crystals in the temperature range 1.5–300 K under pressures between ambient and 20 kbar. In contrast to the recently reported results on sintered or melted material, the resistivity has a metallic behavior. No semiconductor behavior is observed in either type single crystal. The strong scattering effects lead to an electronic mean free path equal to the interatomic Mo-Mo distance. The possibility of spin fluctuations associated with the molybdenum atoms is discussed. The superconductivity appears in either type crystal at about the same pressure (10 kbar).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.335215
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  • 7
    Electronic Resource
    Electronic Resource
    Transport properties of CeAl3 under pressure (1988)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 63 (1988), S. 3899-3901 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Transport experiments on CeAl3 samples under quasihydrostatic pressure up to 1.63 GPa are reported. Magnetoresistivity measurements in magnetic fields up to 7.3 T from 40 mK to 4 K were performed. Resistivity and thermopower were measured from 1.5 to 300 K. Taking the low-temperature resistivity as ρ=ρ0+AT2, A increases initially with pressure as expected from the zero pressure thermal dilatation. Above 0.2 GPa, both A and ρ0 decrease dramatically with pressure. It is, however, noteworthy that a T2 law of the resistivity can hardly be extracted from the data above 0.2 GPa. The positive low-temperature magnetoresistivity also varies strongly with pressure. At 0.82 GPa the low field bump has disappeared and the magnetoresistivity is still positive up to 2.5 K. The thermopower shows an even more drastic pressure dependence. The negative bump around 3.5 K at zero pressure becomes positive above 0.3 GPa and a complex temperature dependence develops. The temperature variation cannot be scaled by a unique pressure-dependent parameter.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.340597
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  • 8
    Electronic Resource
    Electronic Resource
    Two-band model and ground state of heavy fermion compounds (1985)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 57 (1985), S. 3084-3086 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Thermoelectric power (TEP) experiments on 4f instability compounds are described down to very low temperatures. Above 1 K, the data are analyzed in a two-band model; major features are the electron-hole symmetry between cerium and ytterbium and the change of the sign on approaching the trivalent state. At very low temperature, for the trivalent heavy fermion compound CeAl3, a new inversion of the sign of the TEP is observed which is connected with the entrance in the Kondo lattice regime.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.335167
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  • 9
    Electronic Resource
    Electronic Resource
    Localization and magnetic properties in cerium compounds (1985)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 57 (1985), S. 3172-3174 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Magnetic and transport measurements on heavy fermion compounds CeAl3, CeCu2Si2 and CeRu2Si2 are reported. Transport properties show that in CeRu2Si2, the f electron is more delocalized than in CeAl3 or CeCu2Si2. Magnetic data show the apparent cancellation of magnetic correlations for the CeAl3 and CeRu2Si2 compounds which have a nonmagnetic normal ground state; by contrast antiferromagnetic correlations lead to the decrease of the low temperature susceptibility of CeCu2Si2 which has a superconducting ground state.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.335139
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