23 research outputs found

    La-concentration dependence of the low-temparature properties in Pr_{1-x}La_xPb_3

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    We have studied the low temperature properties of Pr_{1-x}La_xPb_3 with the ground state of a non-Kramers Gamma3 Gamma_3 for 0leqxleq1 0 leq x leq 1 . From the concentration dependence of the specific heat, the quadrupolar ordeing, which is observed at TQ=0.4K T_Q=0.4 K in PrPb_3, is expected to occur only up to xsim0.02 x sim 0.02 . For a wide range of La concentration for 0.05leqxleq0.9 0.05 leq x leq 0.9 where the ordering is absent, the specific heat shows a T-linear variation below 0.5 K with a large coefficient, and can be almost reproduced by the model for amorphous materials with a random configuration of two level system. This means that the large C/T C/T is responsible for the superpose of the Schottky specific heat due to splitting of the gamma3 gamma_3 doublet by the distortion of CEF field. For xgeq0.95 x geq 0.95 , C/T C/T increases monotonically with decreasing temperature and can not be reproduced by the above model

    In situ Magnetization Measurement of Superconducting Transition in PdH0.82 and PdD0.79 Prepared by Low-Temperature Absorption

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    We studied the superconducting properties of Pd hydride and deuteride prepared by a low temperature absorption method using in situ magnetization measurements down to T = 0.5 K. The absorption was performed under hydrogen (H2) or deuterium (D2) gas atmosphere at T = 200 K, where the gas pressure and magnetization were monitored simultaneously. From the pressure change caused by the absorption of H (D) in Pd sample, the H (D) content was determined to be 0.82 (0.79). The superconducting state was observed below T ∼ 1.3 K for the both systems. This state was investigated through precise magnetization measurements. The results suggest that H or D atoms are absorbed uniformly over the whole sample.</p

    Volume shrinkage dependence of ferromagnetic moment in lanthanide ferromagnets gadolinium, terbium, dysprosium, and holmium

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    The Gd–Ho series of lanthanide ferromagnets, which includes gadolinium (Gd), terbium (Tb), dysprosium (Dy), and holmium (Ho), undergoes similar structural transitions, e.g., the hcp→Sm-type→dhcp→fcc transitions, under pressure. Through high-field DC magnetic measurements and structural analyses, we found that the ferromagnetic moments disappeared at a specified critical pressure, which resulted in volume shrinkage of 16.7±1.7% for each ferromagnet. The results of the present study suggest that the disappearance of the ferromagnetic moments of Gd–Ho under pressure could be understood within the framework of a band picture related to volume shrinkage
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