## Abstract

Results of the electrical resistivity, magnetoresistance and specific heat measurements are presented for Y_{1-x}Gd_{x}Co_{2} in the vicinity of the critical Gd concentration x_{c} ≈ 0.15 for the onset of a long-range magnetic order. Pronounced maxima of the coefficient y of the T-linear specific heat, Debye temperature and residual resistivity as a function of concentration are found to exist at x = 0.1, i.e. just below x _{c}. These anomalies, together with the existence of a minimum on the temperature dependences of the electrical resistivity at 0 < x < 0.15, are ascribed to the substantial influence of localized spin density fluctuations induced by f-d exchange in the itinerant d-electron subsystem of Co. The maximal extra contribution to the residual resistivity Δρ _{res}^{max} in Y_{1-x}R_{x}Co_{2} pseudobinaries is found to depend on the critical concentration as well as on the type of R ions, while the value of Δγ_{max} depends only on the critical concentration of R ions. The significant upturns on C _{p}/T versus T^{2} dependences observed in Y _{1-x}Gd_{x}Co_{2} at 0 < x < 0.15 may be indicative of a non-Fermi-liquid behaviour of the d-electron subsystem caused by the partial substitution of Gd for Y.

Original language | English |
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Pages (from-to) | 5371-5382 |

Number of pages | 12 |

Journal | Journal of Physics Condensed Matter |

Volume | 15 |

Issue number | 31 |

DOIs | |

State | Published - Aug 13 2003 |

Externally published | Yes |

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