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Magnetic, Thermal and Transport Properties of YbPt_2Si_2 and Yb_2Pt_3Si_5 Single Crystals

100%
Fikáček J., Prchal J., Sechovský V.
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vol. 126
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issue 1
310-311
EN
Single crystals of YbPt_{2}Si_{2} and Yb_{2}Pt_{3}Si_{5} have been prepared by solvent growth method with Sn flux, characterized by X-ray diffraction and by EDX microprobe analysis and investigated by measurement of magnetization, specific heat and electrical resistivity as functions of temperature and magnetic field. YbPt_{2}Si_{2} (Yb_{2}Pt_{3}Si_{5}) crystalizes in the tetragonal CaBe_{2}Ge_{2}-type (orthorhombic U_{2}Co_{3}Si_{5}-type) structure. Both compounds exhibit metallic resistivity behavior without visible anomaly, which could be connected with onset of magnetic ordering. Neither the specific heat shows any sign of magnetic ordering down to 0.5 K. The corresponding temperature dependences of the magnetic susceptibility of both compounds behave qualitatively similar, which is reminiscent of spin fluctuation behavior: a broad maximum at high temperatures, a shallow minimum at lower temperatures, followed by an upturn with further cooling the crystal, which can be suppressed by applying a sufficient magnetic field. The rather low values of the γ-coefficients of the specific heat (~25÷35 mJ·mol·K^{-2}) do not support the mixed valence scenario discussed in literature for YbPt_{2}Si_{2}.
2
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Structural and Magnetic Properties of the PrNi_{1-x}Cu_{x}Al Series

100%
Fikáček J., Javorský P., Klicpera M., Šantavá E.
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issue 5
884-885
EN
Polycrystalline samples of PrNi_{1-x}Cu_{x}Al series were studied by X-ray diffraction, magnetization and specific heat. The hexagonal ZrNiAl-type structure is preserved in the whole series. Compounds with x up to 0.4 order antiferromagnetically with the Néel temperatures between 3 and 5 K. The rest of the compounds (x = 0.5-0.9) exhibits a transition into a spin glass state below the freezing temperatures around 4 K. The analysis of the specific heat data reveals a quasi-doublet ground state well separated from higher crystal field levels in the whole series.
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Magnetic Order in TbPdIn

88%
Javorský P., Fikáček J., Prokleška J., Nishigori S., McIntyre G.
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issue 5
879-880
EN
The magnetic structure in TbPdIn was investigated by neutron diffraction experiments. The results reveal a long-range magnetic structure with propagation vector (0,0,0) and the Tb moments forming a non-collinear structure within the basal plane that is unchanged over the whole temperature region below the ordering temperature of 66 K.
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