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- W2334907576 abstract "Magnetization, electrical-resistivity, Mossbauer-effect, and neutron-diffraction measurements have been made between 1.5 and 300 ifmmode^circelsetextdegreefi{}K for two phases of Np${mathrm{Pd}}_{3}$ and for Pu${mathrm{Pd}}_{3}$. The compounds Pu${mathrm{Pd}}_{3}$ and cubic Np${mathrm{Pd}}_{3}$ have the Au${mathrm{Cu}}_{3}$-type crystal structure. Hexagonal Np${mathrm{Pd}}_{3}$ has the Ti${mathrm{Ni}}_{3}$-type structure and is the room-temperature equilibrium phase. Cubic Np${mathrm{Pd}}_{3}$ can be retained by rapid quenching, and the specimen used in this investigation has a long-range order parameter of $S=0.92$. The cubic Np${mathrm{Pd}}_{3}$ compound is antiferromagnetic with a N'eel temperature ${T}_{N}=(55ifmmodepmelsetextpmfi{}1)$ ifmmode^circelsetextdegreefi{}K, and the magnetic transition is apparently first order, since the sublattice magnetization is constant up to 45 ifmmode^circelsetextdegreefi{}K. A large energy gap $ensuremath{Delta}$ in the spin-wave dispersion relation is observed below 40 ifmmode^circelsetextdegreefi{}K in the electrical resistivity with $ensuremath{Delta}ensuremath{simeq}3k{T}_{N}ensuremath{simeq}kensuremath{Theta}ensuremath{simeq}k(150 ifmmode^circelsetextdegreefi{}mathrm{K})$, where $ensuremath{Theta}$ is the Debye temperature obtained from the resistivity data. Cubic Pu${mathrm{Pd}}_{3}$ is antiferromagnetic below 24 ifmmode^circelsetextdegreefi{}K. Cubic Np${mathrm{Pd}}_{3}$ and Pu${mathrm{Pd}}_{3}$ have a magnetic structure that consists of ferromagnetic (111) planes coupled antiferromagnetically, and they have ordered moments of (2.0ifmmodepmelsetextpmfi{}0.1) ${mathrm{ensuremath{mu}}}_{mathit{B}}$/Np atom and (0.8ifmmodepmelsetextpmfi{}0.1) ${mathrm{ensuremath{mu}}}_{mathit{B}}$/Pu atom, respectively. Hexagonal Np${mathrm{Pd}}_{3}$ does not possess long-range magnetic order, but does appear to have an abrupt transition to short-range magnetic order distributed throughout the bulk below ensuremath{sim}32 ifmmode^circelsetextdegreefi{}K, as indicated by an apparent Curie temperature in the magnetization, a spin-disorder resistivity anomaly, and a broadening of the paramagnetic Mossbauer line as the temperature is lowered from 30 to 4.2 ifmmode^circelsetextdegreefi{}K. Both Np${mathrm{Pd}}_{3}$ phases have the same effective paramagnetic moment of 2.74 ${mathrm{ensuremath{mu}}}_{mathit{B}}$/Np atom, consistent with the ${mathrm{Np}}^{3+}$ ionic configuration, the same volume per formula unit, and essentially the same first-and second-nearest-neighbor neptunium environment. The difference in magnetic behavior between the cubic and hexagonal phases of Np${mathrm{Pd}}_{3}$ is at present not understood." @default.
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- W2334907576 date "1974-02-01" @default.
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- W2334907576 title "Magnetic properties of Np<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant=normal>Pd</mml:mi></mml:mrow><mml:mrow><mml:mn>3</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math>and Pu<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant=normal>Pd</mml:mi></mml:mrow><mml:mrow><mml:mn>3</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math>intermetallic …" @default.
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- W2334907576 doi "https://doi.org/10.1103/physrevb.9.1041" @default.
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