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  • 1
    Electronic Resource
    Electronic Resource
    Thermal expansion and ac initial magnetic susceptibility in RECu intermetallic compounds (abstract) (1988)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 64 (1988), S. 5895-5895 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We have carried out a systematic study of the series RECu cubic intermetallic compounds where RE=Y, Gd, Tb, Dy, and Ho by means of the thermal expansion and ac initial magnetic susceptibility measurements. The measurements clearly show in some of these compounds (RE=Y, Gd, and Tb) very large anomalies associated with a martensitic structural phase transition, from the cubic CICs at room temperature to the tetragonal FeB structure. These anomalies exhibit very large hysteresis effects which make it necessary to reobtain the original CICs crystal structure to anneal the samples up to about 600 K. In the case of TbCu a magnetic-phase transition occurs simultaneously to the structural one; the trigger mechanism which drives this transition has been studied on the basis of the strong influence of the magnetoelastic energy using a single-ion crystal electric-field model within the mean-field approximation. In the case of RE=Dy and Ho only slight anomalies have been observed in the thermal expansion measurements at the region of the magnetic-phase transition and no hysteresis effects were observed. The existence or nonexistence of the spontaneous magnetostriction at the order temperature constitutes a suitable test of the nature of the magnetic structure (collinear or multiaxis) in these systems.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.342193
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  • 2
    Electronic Resource
    Electronic Resource
    Anomalous compressibility and magnetovolume effects in Ce3(FeTi)29 : The 40th annual conference on magnetism and magnetic materials (1996)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 79 (1996), S. 4656-4658 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: In this contribution we present the results of direct measurements of the compressibility, in a wide temperature range, and studies of the linear thermal expansion under hydrostatic pressure using a modified strain gauge method in Ce3(FeTi)29. A large magnetic contribution (κm=0.13 Mbar−1) to the isothermal compressibility was observed in the ferromagnetic state in comparison with the compressibility in the paramagnetic state induced by pressure at room temperature. The pronounced lambda-shaped anomalies in the thermal expansion coefficient (negative values of α) and in the compressibility of the Ce3(FeTi)29 compound were simultaneously observed in the vicinity of TC. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.361695
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  • 3
    Electronic Resource
    Electronic Resource
    Correlation between magnetovolume and giant magnetoresistance effects in doped La2/3Ca1/3MnO3 perovskites : The 40th annual conference on magnetism and magnetic materials (1996)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 79 (1996), S. 5175-5177 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: La0.62Tb0.05Ca0.33MnO3 and La0.6Y0.07Ca0.33MnO3 have been studied in order to probe into the mechanisms responsible for the giant magnetoresistance ratios observed in this kind of compound. The experiments have shown a strong connection between the magnetotransport and magnetovolume properties. A large volume effect appears above Tc which collapses with applied magnetic field or when the long range magnetic order sets in. Above Tc the magnetostriction and magnetoresistance isotherms are highly correlated. Charge localization with local distortion appears to be responsible for the transport and volume properties at zero field. Charge mobility and a more normal volume dependence on temperature are restored by applying high enough magnetic fields. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.361544
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  • 4
    Electronic Resource
    Electronic Resource
    Pressure effect on the resistivity in GMR La0.60Y0.07Ca0.33MnO3 compound (abstract) : The 40th annual conference on magnetism and magnetic materials (1996)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 79 (1996), S. 5178-5178 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The substitution of La+3 by smaller Y+3 ions in mixed valence Mn+3–Mn+4 perovskites La0.67−xYxCa0.33MnO3 gives rise to a decrease of the order temperature (Tc=160±5 K for x=0.07 and Tc=240 K for x=0). One of the most relevant features found in this compound was the extremely large magnetoresistance observed in bulk polycrystals (≈−10 000%) near Tc. This huge effect was associated with the reduction of the lattice parameter. In order to have an insight into the influence of volume change on transport properties in this compound, we have performed measurement of the thermal dependence of the resistivity under hydrostatic pressure up to 8 kbar. At ambient pressure a peaklike anomaly in the resistivity is observed at Tc. Under the former assumptions, one would expect an increase of the resistivity value at the maximum as well as a decrease of Tc. However, we have found a shift toward higher temperatures and a drastic decreasing of the maximum in the resistivity for increasing pressures. At a pressure of 7.5 kbar the anomaly in the resistivity almost disappears and consequently the GMR effect. As a consequence, the effect of pressure seems to be identical to the effect of the applied magnetic field. Ibarra et al. recently observed a large spontaneous magnetovolume effect at Tc with an extra contribution to the lattice thermal expansion. This extra contribution was found to be suppressed by an applied magnetic field. From these preliminary results it seems that the interplay between magnetostrictive deformations and the shrinkage of the lattice by external pressure could be in the origin of the observed behavior. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.361330
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  • 5
    Electronic Resource
    Electronic Resource
    Magnetostriction and thermal expansion measurements on FeRh1−xPtx alloys : The 40th annual conference on magnetism and magnetic materials (1996)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 79 (1996), S. 4659-4661 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We report high-field magnetostriction and thermal expansion measurements in FeRh1−xPtx (x=0.75, 0.765, and 0.7) compounds. From the thermal expansion measurements we have observed the para-ferromagnetic and ferro-antiferromagnetic transitions for x=0.75 and 0.765, and the para-antiferromagnetic transition in the 0.7 compound. The volume expansion associated with the first-order transitions has been determined. The results of the magnetostriction measurements are complex and are explained here on the basis of an induced transition from an antiferromagnetic to a ferromagnetic state, induced by the applied magnetic field. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.361696
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  • 6
    Electronic Resource
    Electronic Resource
    High pulsed field magnetostriction in Ho2Fe17 single crystal : 37th Annual conference on magnetism and magnetic materials (1993)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 73 (1993), S. 6147-6149 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Magnetostriction measurements were performed on Ho2Fe17 single crystals, using high pulsed magnetic fields up to 15 T and in the temperature range of 5–300 K. Volume deformations in the basal plane have been observed to be one order of magnitude greater than the volume longitudinal deformation along the c axis. The main contribution to the magnetostriction modes arises from the 3d–3d exchange interaction.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.352731
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  • 7
    Electronic Resource
    Electronic Resource
    Magnetic anisotropy and spin reorientation transition in a TbFe11Ti single crystal (abstract) : The 40th annual conference on magnetism and magnetic materials (1996)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 79 (1996), S. 6330-6330 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Very large discrepancies exist with regard to the spin reorientation transition in TbFe11Ti (see Ref. for a summary of the different results). In this work, this transition is studied by measuring the angular dependence of the parallel (M(parallel)) and perpendicular (M⊥) components of the magnetization to the applied magnetic field in the temperature range of 4.2–330 K and applied magnetic fields ranging from 2 to 15 kOe. This method allows an accurate determination of the easy magnetization direction to be made, i.e., the maximum value of M(parallel) and the zero value of M⊥. The experimental results have undoubtedly established that the compound is easy plane below 260 K and easy axis above 320 K. Within this intermediate range of temperature the easy magnetization direction lies along a nonmajor symmetry direction making an angle θ with the c axis. This angle depends on the applied magnetic field and the magnetic history of the sample. This fact can be understood on the basis of the existence of a first-order spin reorientation transition at TSR≈320 K from easy axis to easy plane. Within the temperature region 206–320 K both phases (axial and planar) coexist with relative volumes depending on the applied magnetic field and the magnetic history. This gives rise to a macroscopic conical structure. Such behavior has already been observed in DyFe11Ti. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.362453
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  • 8
    Electronic Resource
    Electronic Resource
    Magnetovolume effects and magnetic anisotropy in Ce3(FeM)29 compounds (M=Ti, Cr) (1995)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 78 (1995), S. 4615-4620 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The magnetovolume effects and magnetic anisotropy of the new Ce3(FeTi)29 and Ce3(FeCr)29 compounds have been studied by measuring their linear thermal expansion (LTE), pressure dependence of the Curie temperature Tc, compressibility, and anisotropy field. The value of Tc, its pressure dependence dTc/dp, and anisotropy field HA for the Ce(FeCr)12 phase are also reported. The linear thermal expansion of these compounds exhibits Invar-like behavior with large positive values of the spontaneous magnetostriction at Tc [e.g., ωs(0)≈1.2% in Ce3(FeTi)29]. Different values of the compressibility have been observed in the ferromagnetic and paramagnetic states of Ce3(FeTi)29 (κf=1.25×10−3 kbar−1 and κp=1.12×10−3 kbar−1) in qualitative agreement with the large magnetovolume effect observed in the LTE. Tc for all the phases studied decreases under pressure with initial slopes dTc/dp=−3.75, −3.6, and −2.7 K/kbar for Ce3(FeTi)29, Ce3(FeCr)29, and Ce(FeCr)12, respectively. Two anisotropy fields have been detected in Ce3(FeTi)29 associated with saturation along the b (HA) and c (H′A) axes of the monoclinic structure. The temperature dependence of H′A for Ce3(FeCr)29 and HA for Ce(FeCr)12 is also reported. © 1995 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.359807
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  • 9
    Electronic Resource
    Electronic Resource
    Low-field ac magnetic susceptibility under pressure in GdMn2 and TbMn2 intermetallics : 38th Annual Conference on Magnetism and Magnetic Materials (1994)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 75 (1994), S. 7158-7160 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Low-field ac magnetic susceptibility experiments under pressure up to 10 kbar have been performed on the GdMn2 and TbMn2 compounds in the temperature range of 4–300 K. The results reveal the possible coexistence of two phases below TN, one in which the magnetic moment of Mn is stable and other in which the Mn does not present any magnetic moment.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.356710
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  • 10
    Electronic Resource
    Electronic Resource
    Spin reorientation transition in some REFe10V2 intermetallics under hydrostatic pressure : 37th Annual conference on magnetism and magnetic materials (1993)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 73 (1993), S. 5905-5907 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The large effect of the applied hydrostatic pressure on the spin reorientation transition (SRT) temperature observed in Er2Fe14B has been associated with the modification of the intensity of the CEF interaction with pressure. We propose that mainly the second order CEF terms are sensitive to the pressure and also that the applied pressure influences only slightly the fourth and sixth order CEF terms and the intensity of the R-Fe exchange interaction. In the present article, we report a study of the thermal dependence of the ac magnetic susceptibility under hydrostatic pressure up to 10 kbar in intermetallic compounds of the series RFe10V2 (R=Nd, Dy, and Er). The results show no evidence of any change of the SRT temperature in the measured range of pressure, which constitutes a confirmation of the negligible influence that the external applied pressure has on high order CEF terms.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.353517
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