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  • 1
    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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  • 2
    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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  • 3
    Electronic Resource
    Electronic Resource
    Magnetocrystalline anisotropy in some RENi5 intermetallics : 37th Annual conference on magnetism and magnetic materials (1993)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 73 (1993), S. 6054-6056 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Measurements of the parallel M(parallel) and perpendicular M⊥ components of the magnetization to the applied magnetic field HA have been carried out for all directions in the (010) plane on single crystals of hexagonal NdNi5, TbNi5, and HoNi5. These measurements were performed using a steady magnetic field of 15 kOe, in the ferromagnetic phase down to 4 K. These kinds of experiments allow a detailed description of the magnetocrystalline anisotropy to be given. The polar dependencies of the M(parallel) and M⊥ isotherms have been explained using a microscopic single-ion crystal electric field (CEF) and a molecular-field approximation to describe the exchange interaction.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.353467
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  • 4
    Electronic Resource
    Electronic Resource
    Magnetic anisotropy and magnetization processes in 3:29 and 1:12 Nd(FeTi)-based compounds (1994)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 76 (1994), S. 7473-7477 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The temperature behavior of the magnetic anisotropy and magnetization processes in the tetragonal Nd(FeTi)12 and monoclinic Nd3(FeTi)29 have been studied and compared. Both compounds are characterized by the occurrence of temperature-induced spin reorientation transitions, as well as field-induced magnetization processes of different types, which have been interpreted as first-order magnetization process. In both systems the resultant anisotropy of Nd favors the occurrence of an easy magnetization direction out of the principal axes at low temperature. On the contrary the overall Fe sublattice anisotropy favors the tetragonal c-axis in the 1:12 and seems to prefer the monoclinic a-axis in the 3:29 compound. © 1994 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.357976
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  • 5
    Electronic Resource
    Electronic Resource
    Magnetocaloric effect in Tb5(SixGe1−x)4 (2001)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 79 (2001), S. 1318-1320 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The magnetocaloric effect has been investigated in a series of the R5(SixGe1−x)4 pseudobinary alloys with R=Tb and x=0.0, 0.5, and 1.0. In Tb5Si4 and Tb5Ge4, a maximum magnetic entropy change of 9.8 and 3.7 J/kg K, respectively, has been found at their ordering temperatures for a magnetic field change of 50 kOe. In the case of Tb5Ge4, we have observed the existence of a previously unreported magnetic transition below the Néel temperature. Tb5(Si0.5Ge0.5)4 has been successfully synthesized, and a large entropy change of 21.8 J/kg K (ΔH=50 kOe) is achieved at a first-order para- to ferromagnetic transition, TC≅105 K. This study demonstrates that Tb5(SixGe1−x)4 alloys are good candidates for magnetic refrigeration and that very exciting phenomenology in these systems awaits further investigation. © 2001 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1399007
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  • 6
    Electronic Resource
    Electronic Resource
    Giant magnetoresistance near the magnetostructural transition in Gd5(Si1.8Ge2.2) (1998)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 73 (1998), S. 3462-3464 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Zero-field electrical resistivity over the temperature range of 4–300 K and magnetoresistance in magnetic fields of up to 12 T have been measured in Gd5(Si1.8Ge2.2). This system undergoes a first-order magnetostructural transition at TC≅240 K, from a high-temperature paramagnetic to a low-temperature ferromagnetic phase, accompanied by a large drop in the resistivity. The application of an external magnetic field above TC can induce this transition, and a giant negative magnetoresistance effect (Δρ/ρ≅−20%) is observed associated with this first-order field-induced transition. © 1998 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.122797
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  • 7
    Electronic Resource
    Electronic Resource
    Magnetoelastic and pressure effects at the ferro–antiferromagnetic transition in Hf1−xTaxFe2−y alloys (abstract) : The 41st annual conference on magnetism and magnetic materials (1997)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 81 (1997), S. 5705-5705 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Magnetostriction measurements using high pulsed magnetic field up to 14 T and thermal expansion measurements under hydrostatic pressure up to 10 kbar have been performed in the 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=245 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(approximate)0.56% and 0.38% for x=0.17 and x=0.15, respectively. The hydrostatic pressure significantly decreases the temperature of the AF–F transition whereas the thermal expansion anomaly is becoming more pronounced. The dependence of TAF–F on pressure follows a quadratic behavior and TAF–F reaches the value of 106 K at 10.5 kbar for x=0.17. In the search for high magnetostrictive materials, we have found in these alloys a giant value of the volume magnetostriction (ω(approximate)0.6% for the x=0.17 compound) at a moderate applied magnetic field within the AF phase near room temperature, making of these alloys potential candidates for magnetostrictive transducers. All the experimental results will be explained assuming the existence of two different states as has been proposed by Moruzzi.1© 1997 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.364642
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  • 8
    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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  • 9
    Electronic Resource
    Electronic Resource
    A determination of the crystal electric field and exchange parameters of Pr^3^+ and Nd^3^+ ions in RCo"5 intermetallics
    Amsterdam : Elsevier
    Journal of Magnetism and Magnetic Materials 104-107 (1992), S. 1149-1151 
    Details
    ISSN: 0304-8853
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1016/0304-8853(92)90527-U
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  • 10
    Electronic Resource
    Electronic Resource
    Pressure effects on the spin reorientation transitions in rare-earth intermetallics
    Amsterdam : Elsevier
    Journal of Magnetism and Magnetic Materials 104-107 (1992), S. 1371-1372 
    Details
    ISSN: 0304-8853
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1016/0304-8853(92)90624-W
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