1 research outputs found
Unusual Ground State Properties of the Kondo-Lattice Compound Yb2Ir3Ge5
We report sample preparation, structure, electrical resistivity, magnetic
susceptibility and heat capacity studies of a new compound YbIrGe.
We find that this compound crystallizes in an orthorhombic structure with a
space group PMMN unlike the compound CeIrGe which crystallizes in
the tetragonal IBAM (UCoSi type) structure. Our resistivity
measurements indicate that the compound YbIrGe behaves like a
typical Kondo lattice system with no ordering down to 0.4 K. However, a
Curie-Weiss fit of the inverse magnetic susceptibility above 100 K gives an
effective moment of only 3.66 which is considerably less than the
theoretical value of 4.54 for magnetic Yb ions. The value of
= -15.19 K is also considerably higher indicating the presence of
strong hybridization. An upturn in the low temperature heat capacity gives an
indication that the system may order magnetically just below the lowest
temperature of our heat capacity measurements (0.4 K). The structure contains
two sites for Yb ions and the present investigation suggests that Yb may be
trivalent in one site while it may be significantly lower (close to divalent)
in the other.Comment: 9 pages, 4 figures. submitted to Phys. Rev.