We have grown single crystals of the ternary uranium compound U{sub 2}Rh{sub 3}Si{sub 5} which crystallizes in a monoclinic Lu{sub 2}Co{sub 3}Si{sub 5} structure with space group C2/c. U{sub 2}Rh{sub 3}Si{sub 5} exhibits a single dramatic phase transition at 25.6K. Here the specific heat peaks to more than 100J/U-molK, and the magnetic susceptibility is strongly anisotropic and shows a steplike drop at the ordering temperature. The electrical resistivity is also anisotropic with indications for the appearance of superzone and spin-wave gaps. We relate this behavior to a (weak) first-order phase transition into a simultaneous spin-quadrupolar ordering. {copyright} {ital 1997} {ital The American Physical Society}

/pdf/unusual-ordering-behavior-in-single-crystal-u2rh3si5-4apjwg4h9c.pdf

Unusual Ordering Behavior in Single-Crystal U2Rh3Si5

The evolution of magnetic, transport, thermal, structural and spectroscopic properties as a function of the Ce-ligand substitution, Ce(X1−xYx)kZl, is analyzed on about 30 systems. Two concentrations, x0 and xcr, related to independent transformations of the Ce ground state (GS) are characterized: x0 corresponds to the magnetic phase boundary and xcr to a change of regime in the x dependence of all the aforementioned properties. The usual qualitative comparison of different Ce systems, made according to Doniach's model (that takes the x0 concentration as reference), is improved by the possibility of a quantitative comparison among those systems by normalizing the Ce-ligand concentrations as y = (x − xcr)/(x0 − xcr). The microscopic origin of xcr is found to be related to the modification of the Ce-GS symmetry properties when the increase of the hybridization strength becomes comparable to the crystal field splitting and, therefore, ground and excited crystal field states overlap. Intrinsic differences between heavy fermion and intermediate valence GS, their coexistence with magnetic order and the formation of non-Fermi liquid states are discussed in terms of the relative values of x0 and xcr.

Characteristic concentrations in Ce ground state transformations induced by alloying

Ab initio investigation of the electronic structures of ternary germanides CeRhGe and CeIrGe

Magnetic properties of CeRhGe and NdRhGe compounds

Transport and magnetic properties of U2Ni2Sn and U2Co2Sn

Transport and Magnetic-properties of U(2)m(3)si(5) Silicides (m=co,Rh,Ru)

In order to study the transition from an antiferromagnetic behaviour (CeRhGe) to an intermediate valence state (CeIrGe), the Ce(Rh1-xIr x )Ge system has been investigated using various techniques: X-ray diffraction, magnetic susceptibility, electrical resistivity and CeLIII absorption edge. All alloys crystallize in the orthorhombic TiNiSi-type structure with a sharp decrease of the unit cell volume forx=0.25–0.30 corresponding to a cerium valence change.

Transition from an antiferromagnetic behaviour to an intermediate valence state in the Ce(Rh1-x Ir x )Ge system

With XRD, R-T, and ac chi measurements a comparative study on the doping effects of 3d elements in Bi(1.5)Pb(0.2)Sr(2)Ca(2)Cu(2.8)M(0.2)O(y) (M = Sc, Ti, V, Cr, Mn, Fe, Co, Ni, or Zn) has been carried out. The effects of the former five members are significantly different, both on phase formed and on T-c, from the latter four. It seems that the effect on phase stabilization correlates with the valency of the doped cation. In connection with the instability of the 2223 phase, the correlation has been discussed.

Comparative study on the doping effect of 3d elements in Bi1.5Pb0.2Sr2Ca2Cu2.8M0.2O y (M=Sc, Ti, V, Cr, Mn, Fe, Co, Ni, or Zn)

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Transport and Magnetic-properties of U(2)m(3)si(5) Silicides (m=co,Rh,Ru)

Transition from an antiferromagnetic behaviour to an intermediate valence state in the Ce(Rh1-x Ir x )Ge system

Comparative study on the doping effect of 3d elements in Bi1.5Pb0.2Sr2Ca2Cu2.8M0.2O y (M=Sc, Ti, V, Cr, Mn, Fe, Co, Ni, or Zn)