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  • American Institute of Physics (AIP)  (5)
  • 1
    Electronic Resource
    Electronic Resource
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 73 (1993), S. 6153-6155 
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The spontaneous linear magnetostriction at T=0 K in YCo4B is positive along the a axis (λa=1.1×10−3) and negative along the c axis (λc=−2.1×10−3), although the volume magnetostriction below Tc is negligibly small and below the resolution of the x-ray measurement. In CeCo4B, however, both λa and λc are smaller and below about 130 K, a negative volume magnetostriction of the order of 10−3 is observed. An anomalous increase of the resistivity is also found at the same temperature range. This anomalous behavior is assumed to be related with the Ce magnetism in CeCo4B.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 75 (1994), S. 6602-6602 
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: RCu2 compounds (R=rare earth) with orthorhombic crystal structures exhibit a rich variety of magnetic structures at low temperatures, originating from a subtle interplay between RKKY-type exchange and crystal field anisotropy. Though most of the magnetic properties of NdCu2 are well understood,1 there are controversial proposals for the magnetic phases, as deduced from different experiments.1,2 Therefore we have investigated the magnetic structure of NdCu2 by neutron diffraction as a function of temperature between 1.4 and 8 K in the zero external field. The diffraction patterns of a powdered sample were obtained on the multidetector DN5 at the SILOE reactor of CEN-G. Only two different magnetic phases were observed, in agreement with Ref. 1. For temperatures between 5.2 K and TN=6.5 K, the magnetic structure can be described by a sinusoidal oscillating component along b with wave vector τ2=(0.62, 0.042, 0). Accordingly, the structure is incommensurate with the lattice. Below 4.0 K the structure remains an oscillating component along b. However, the wave vector becomes commensurate with the lattice and is given by τ1=(0.60, 0, 0). Additionally, a progressive squaring up from the appearance of the third harmonic 3τ in the range from 4.0 K down to 1.4 K is observed. At 1.4 K the amplitudes of the fundamental and the third harmonic are 2.4μB and 0.9μB, respectively. Around 4.4 K, the spectra seem to be determined by a superposition of the high- and low-temperature phases. The low-temperature structure of NdCu2 is comparable with that for TmCu2, observed earlier in Ref. 3. Though in that work a different interpretation was chosen, the wave vector of the fundamental oscillation can be described by (0.625, 0, 0), while the amplitudes for the fundamental and third harmonic are given by 8.0μB and 2.6μB, respectively.
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  • 3
    Electronic Resource
    Electronic Resource
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 67 (1996), S. 1970-1975 
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: A dc method for thermopower (TP) measurements in magnetic fields up to 17 T in the temperature range from 3 K to 300 K is introduced. A special heating technique named "seesaw heating,'' a method similar to ac methods, was developed and resulted in good thermal stability, better accuracy and a faster procedure. Chromel–constantan thermocouples were utilized for measuring probes because of small and simple temperature dependence of magnetic field effect. Finding an empirical formula for all the calibration curves of TP of Chromel enable us to measure TP at any field and at any temperature. Finally, the experimental results on ErCo2 and LaRu2 are presented as test examples to demonstrate the possibilities and accuracy of our setup. © 1996 American Institute of Physics.
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  • 4
    Electronic Resource
    Electronic Resource
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 69 (1998), S. 2742-2746 
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: A very small capacitive sensor for measuring thermal expansion and magnetostriction of small and irregular shaped samples has been developed. A capacitive method with tilted plates is used. The tilted plate capacitance formula is used for the calculation of the capacitor gap, the calibration is performed by measuring the signal of a standard material. The active length of the sample can be less than 1 mm. The absolute resolution is about 1 Å. All mechanical connections of the dilatometer are carried out by tiny Cu–Be springs, enabling the small force on the sample to be adjusted (50–500 mN) and no additional sample fixing is necessary. The cell has been tested in the temperature range 0.3–200 K and in static magnetic fields up to 15 T. The zero signal of the dilatometer has been determined by measuring a silver sample. The correct operation and reproducibility has been verified by measuring the thermal expansion of Cu. The thermal expansion and magnetostriction of a DyCu2 single crystal has been determined. The advantage of this method compared to specific heat measurements is that a large temperature range can be covered with one equipment. This high static and dynamic range of sample length, temperature, and magnetic field suggests a number of possible applications, like the investigation of crystal field effects on the magnetoelastic properties of single crystals or structural phase transitions. © 1998 American Institute of Physics.
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  • 5
    Electronic Resource
    Electronic Resource
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 61 (1987), S. 3985-3986 
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The intermetallic compound HoCo2 is magnetically ordered and changes its directon of magnetization around 15 K, as the temperature is increased, from [110] to [100]. We report a 59Co pulsed NMR study of HoCo2 in the temperature range 4–65 K. The NMR spectra show two peaks at low temperature and one peak at high temperatures, as expected from a model whereby the magnetic equivalence of the cobalt sites is determined by the direction of magnetization. This change in the spectra can be simulated from lattice sums of the magnetic dipolar fields acting on the cobalt sites. The present results are consistent with a change of direction of magnetization from [110] to [100] through intermediate directions contained in the plane z=0.
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