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The magnetic instability of Yb<sub>2</sub>Pd<sub>2</sub>(In,Sn) in a non-Fermi liquid environment
Bauer, E,Hilscher, G,Michor, H,Paul, Ch,Aoki, Y,Sato, H,Adroja, D T,Park, J-G,Bonville, P,Godart, C,Sereni, J,Giovannini, M,Saccone, A IOP Pub 2005 Journal of physics, an Institute of Physics journa Vol.17 No.11
<P>Various concentrations of the solid solution Yb<SUB>2</SUB>Pd<SUB>2</SUB>In<SUB>1−<I>x</I></SUB>Sn<SUB><I>x</I></SUB> ranging from <I>x</I> = 0 to 1 with the tetragonal Mo<SUB>2</SUB>FeB<SUB>2</SUB>-type structure were prepared and their physical properties were studied by means of bulk and spectroscopic measurements as a function of temperature, pressure and magnetic fields. Results deduced from these studies indicate a slight variation of the valency of the Yb ions, from <img SRC='http://ej.iop.org/images/0953-8984/17/11/032/cm192308ieqn1.gif' ALIGN='MIDDLE' ALT='\nu \approx 2.9 '/> for both border compounds to &ngr; = 3 at <I>x</I> = 0.6. This variation gives rise to the appearance of long range magnetic order in a narrow concentration region around <I>x</I> = 0.6, while both border compounds remain non-magnetic. The outstanding concentration dependence for the ordered regime may be indicative of two quantum critical points, a novel feature not yet observed in Yb compounds. </P>