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

• Authors: J. Fikáček , J. Prchal , V. Sechovský
• Languages of publication: EN

Abstracts

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}.

Keywords

EN

61.50.-f; 75.20.En; 75.30.Mb

Discipline

• 61.50.-f: Structure of bulk crystals
• 75.30.Mb: Valence fluctuation, Kondo lattice, and heavy-fermion phenomena(see also 71.27.+a Strongly correlated electron systems, heavy fermions; for heavy-fermion superconductors, see 74.70.Tx)
• 75.20.En: Metals and alloys

• Journal: Acta Physica Polonica A
• Year: 2014
• Volume: 126
• Issue: 1
• Pages: 310-311

Dates

published

2014-07

Contributors

author

J. Fikáček

• Department of Condensed Matter Physics, Faculty of Mathematics and Physics, Charles University in Prague, Ke Karlovu 5, 121 16 Prague 2, Czech Republic

author

J. Prchal

• Department of Condensed Matter Physics, Faculty of Mathematics and Physics, Charles University in Prague, Ke Karlovu 5, 121 16 Prague 2, Czech Republic

author

V. Sechovský

• Department of Condensed Matter Physics, Faculty of Mathematics and Physics, Charles University in Prague, Ke Karlovu 5, 121 16 Prague 2, Czech Republic

References

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Identifiers

DOI

10.12693/APhysPolA.126.310