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  • 1
    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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  • 2
    Electronic Resource
    Electronic Resource
    Magnetization and magnetocrystalline anisotropy of R2Fe17 intermetallics under pressure (1999)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 85 (1999), S. 4874-4876 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The measurements of magnetization and magnetic anisotropy of R2Fe17 (R=Y, Er, Ho, and Gd) single crystals were performed under hydrostatic pressure up to 1 GPa, in temperature range 5–300 K and at magnetic fields up to 5 T, using the SQUID magnetometer with a miniature pressure CuBe cell. A pronounced decrease of spontaneous magnetization M of the R2Fe17 intermetallics has been observed under pressure. The values of dM/dp vary in an interval from −0.32μB/f.u. per kbar (Y2Fe17) up to −0.1μB/f.u. per kbar (Ho2Fe17). The R elements in the R2Fe17 intermetallics have a strong influence on the d(ln mFe)/dp values at 5 K. A remarkable decrease of the anisotropy constant with pressure, d ln K1/dp=−1.7×10−2 kbar−1 at 5 K, was observed on the Y2Fe17 compound. In the Gd2Fe17 compound, |K1(T)| increases with increasing pressure below 150 K and decreases with increasing pressure above this temperature value. The critical field HC(T) of the FOMP in the Er2Fe17 compound exhibits a similar behavior, it increases under pressure at temperatures below 60 K and decreases at higher temperatures. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.369127
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  • 3
    Electronic Resource
    Electronic Resource
    High pulsed field magnetostriction in RMn2 (R=Gd, Tb, Nd, and Y) : 38th Annual Conference on Magnetism and Magnetic Materials (1994)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 75 (1994), S. 5662-5664 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We have performed thermal expansion and magnetostriction experiments on several compounds of the series RMn2 and R(Mn1−xNix)2 (R=Nd, Gd, Tb, and Y) using high pulsed magnetic field up to 15 T in the temperature range 4–300 K. A giant volume magnetostriction of ω=−17×10−3 was observed in TbMn2 at 15 T and 4 K. A negligible forced volume magnetostriction was observed in YMn2. In GdMn2 paramagnetic magnetostrictive behavior was found below TN. Magnetostriction experiments were confirmed as a powerful tool in order to determine the stability of the magnetic moment on Mn in this series of compounds.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.355629
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  • 4
    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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  • 5
    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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  • 6
    Electronic Resource
    Electronic Resource
    Magnetoelastic and pressure effects at the antiferro–ferromagnetic transition in Hf1−xTaxFe2−y alloys (1996)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 80 (1996), S. 6911-6914 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Magnetostriction measurements using high-pulsed magnetic fields up to 14 T and thermal expansion measurements under hydrostatic pressure up to 12 kbar have been performed in Hf1−xTaxFe2−y alloys with x=0.17 and 0.15 and y=0.02. These compounds have a first-order magnetic phase transition from an antiferromagnetic (AF) high-temperature state to a ferromagnetic (F) low-temperature state at TAF–F=246 and 290 K, respectively. This transition is accompanied by a volume expansion from the low-volume AF state to the high-volume F state of ΔV/V≈0.56% and 0.38% for x=0.17 and 0.15, respectively. Hydrostatic pressure decreases significantly the AF–F transition temperature, whereas the thermal expansion anomaly becomes more pronounced. The dependence of TAF–F on pressure follows a quadratic behavior and TAF–F reaches a value of 106 K at 10.5 kbar for x=0.17. In search of high magnetostrictive materials, we have found a giant volume magnetostriction value (e.g., ω≈0.7% for the x=0.17 compound) in these alloys at a moderate applied magnetic field within the AF phase near room temperature, making these alloys potential candidates for magnetostrictive transducers. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.363763
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  • 7
    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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  • 8
    Electronic Resource
    Electronic Resource
    Magnetovolume effects and anomalous compressibility of Nd2Fe17 and Nd2(FeTi)17 compounds : The 41st annual conference on magnetism and magnetic materials (1997)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 81 (1997), S. 5693-5695 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We present the results of direct measurements of the isothermal compressibility up to 13 kbar on Nd2Fe17 and Nd2(FeTi)17 compounds and the results of measurements of the linear thermal expansion on Nd2Fe17 compound under hydrostatic pressure up to 6 kbar in temperature range 200–400 K covering both ferromagnetic and paramagnetic region using a modified strain gauge method. A large magnetic contribution to the compressibility κm∼0.15 Mbar−1 was observed in the ferromagnetic state of the Nd2Fe17 compound. The pronounced lambda-shaped anomalies in the thermal expansion coefficient α (negative values of α) and the maximum of compressibility were simultaneously observed nearby the Curie temperature. The corresponding thermodynamic relations are used to analyze the pressure behavior. © 1997 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.364903
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  • 9
    Electronic Resource
    Electronic Resource
    Thermal conductivity and magnetic transitions in Mn3+/Mn4+ manganites : The 7th joint MMM-intermag conference on magnetism and magnetic materials (1998)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 83 (1998), S. 7204-7206 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We report on a comparative study of three manganites: Pr0.5Sr0.5MnO3, Pr0.5Ca0.5MnO3, and Pr0.5Sr0.3Ca0.2MnO3, which all exhibit the same Mn3+/Mn4+=1:1 concentration but show a very distinct magnetic behavior. The Pr0.5Sr0.5MnO3 sample is a ferromagnet (FM) below TC=265 K and becomes the A-type antiferromagnet at TN=140 K. In Pr0.5Ca0.5MnO3 the charge order develops at TCO=245 K and the CE-type antiferromagnetism occurs below TN=175 K. The Pr0.5Sr0.3Ca0.2MnO3 sample exhibits the FM transition at TC=225 K and the CE type antiferromagnetism and charge ordering occur simultaneously at TN=TCO=160 K (185 K) upon cooling (heating), respectively. The study is complemented by the data on two systems of 30% Mn4+, the ferromagnetic metal Pr0.7Sr0.1Ca0.2MnO3, and insulator Pr0.85K0.15MnO3, both with similar Curie temperature TC∼140 K. The electrical resistivity, thermoelectric power, thermal conductivity, and volume thermal expansion data are analyzed with respect to observed magnetic transitions and reveal the significantly distinct ground state of the A-type and CE-type antiferromagnets. We suppose that phonons and charge carriers are coupled via the Jahn–Teller effect and the CMR effect observed in manganites originates thus from a mutual interplay of a strong electron–phonon interaction and spin order. © 1998 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.367677
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  • 10
    Electronic Resource
    Electronic Resource
    Pressure effect on yttrium doped La0.60Y0.07Ca0.33MnO3 compound (1995)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 67 (1995), S. 2875-2877 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We report the effect of hydrostatic pressure up to 8 kbar on magnetoelastic, magnetic, and transport properties in the temperature range 10–300 K. An increase of Curie temperature Tc with pressure ΔTc/Δp=2.6 K/kbar was determined from ac susceptibility measurements. The anomalies in resistivity and magnetovolume effects are significantly suppressed by pressure but the temperatures of these anomalies increased with pressure with the same slope as Tc. These results indicate that impurity state of yttrium rather than lattice parameter reduction is responsible for the large increase in the magnetoresistance observed in the doped compound. © 1995 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.114814
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