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- W2013797781 abstract "We have succeeded in doping hydrogen into the ``semiheavy'' ${mathrm{UPd}}_{2}$${mathrm{Al}}_{3}$ up to a stable concentration of ${mathrm{UPd}}_{2}$${mathrm{Al}}_{3}$${mathrm{H}}_{1.3}$. Magnetism is depressed in ${mathrm{UPd}}_{2}$${mathrm{Al}}_{3}$${mathrm{H}}_{mathit{x}}$: ${mathit{T}}_{mathit{N}}$ falls from 14.5 K with an initial slope of about 55 mK/%H, ensuremath{chi}(1.8 K) initially remains relatively constant but rises substantially for x>0.34 to 21.4 memu/mole at x=1.30, while the effective moment inferred from the Curie-Weiss behavior in the susceptibility above 100 K falls monotonically with hydrogen doping from 3.39${mathrm{ensuremath{mu}}}_{mathit{B}}$ for x=0 to 2.82${mathrm{ensuremath{mu}}}_{mathit{B}}$ for x=1.30. Superconductivity is totally suppressed by approximately x=0.5. At the same time as the antiferromagnetic peak in the specific heat is being depressed to lower temperatures with increasing x, the specific heat divided by temperature data show more and more of an upturn below 10 K, reminiscent of the behavior seen in heavy fermion systems like ${mathrm{CeCu}}_{2}$${mathrm{Si}}_{2}$. Whether or not this upturn in C/T is magnetic in character was checked via measurements of the magnetization at 1.8 K, which showed no signs of saturation up to 5.5 T, and of the field dependence of the low-temperature (0.3 Kensuremath{le}T1.5 K) specific heat in 14 T, which showed approximately a 25% decrease. Such a decrease in the specific heat with field is significantly smaller than that seen in, e.g., ${mathrm{CeCu}}_{6}$ (65% suppression in 14.5 T) where magnetic correlations are thought to be strong, and is similar to the size effect seen in nonsuperconducting samples of ${mathrm{CeCu}}_{2}$${mathrm{Si}}_{2}$ (35% suppression in 10 T). However, whether this upturn in C/T in ${mathrm{UPd}}_{2}$${mathrm{Al}}_{3}$${mathrm{H}}_{1.3}$ is indicative of an electron effective mass increased by a factor of 4 vs pure ${mathrm{UPd}}_{2}$${mathrm{Al}}_{3}$, or due to magnetic correlations/short-range magnetic order remains an open question." @default.
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- W2013797781 date "1994-10-01" @default.
- W2013797781 modified "2023-09-24" @default.
- W2013797781 title "Effects of hydrogen doping onUPd2Al3" @default.
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- W2013797781 doi "https://doi.org/10.1103/physrevb.50.9948" @default.
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