Bauer, E., A. Galatanu, P. Rogl, M. G. Berisso, P. Pedrazzini, and J. G. Sereni. "Loss of magnetism in CePd2xNixAl3." PHYSICA BCONDENSED MATTER 312 (2002): 464–465.
Abstract: Hexagonal CePd2xNixAl3 exhibits a crossover from a Kondo lattice showing magnetic order at T(N)similar or equal to2.8 K for xless than or equal to0.2 to intermediate valence (IV) for x>2. Though TN(x) is weakly affected upon Pd/Ni substitution before vanishing at finite temperature, the Kondo temperature TK progressively increases. Above xsimilar or equal to0.3 the phase boundary no longer exists and strong spin fluctuations cause pronounced deviations from a Fermiliquid ground state before the IV regime is established for xgreater than or equal to1. (C) 2002 Elsevier Science B.V. All rights reserved.

Bauer, E., R. Hauser, A. Galatanu, A. Lindbaum, G. Hilscher, H. Sassik, H. Kirchmayr, J. G. Sereni, and P. Rogl. "New phase boundary between magnetic and nonFermiliquid in Ce(Rh1xRux)(3)B2, for 0 <= x <= 0.4." Journal of Applied Physics 83, no. 11 (1998): 6423–6425.
Abstract: A study of the temperaturedependent magnetic susceptibility and electrical resistivity rho(T) (0.5300 K) on singlephase alloys (CaCu5 type), prepared by argon are melting, reveals a magnetic phase transition with a nonmonotonous decrease of the ordering temperature from Tc = 115 K for x = 0 to Tc approximate to 0 for x = 0.40. A kink in the susceptibility at about 70 K indicates that ferromagnetism (at x < 0.1) transforms to a complex magnetic order for 0.125 less than or equal to x less than or equal to 0.35. Above that concentration rho(T) = rho(0) + AT(n) changes from n approximate to 2 to n approximate to 1.5, a characteristic for nonFermiliquid behavior. Under pressure Tc stays almost constant for x = 0.125 but dT(c)/dp grows with increasing Ru content. On the contrary, applied fields up to 12 T do not affect Tc. Lowtemperature specific heat and ac susceptibility for x = 0.40 confirm the absence of longrange magnetic order down to 0.5 K, For x = 0.35 Cp/T = 62 mJ/mol K at 1.5 K, a value which is three times larger than that of CeRh3B2. (C) 1998 American Insitute of Physics. [S00218979(98)465113].

Bauer, E., R. Hauser, A. Galatanu, H. Michor, G. Hilscher, J. Sereni, M. G. Berisso, P. Pedrazzini, M. Galli, F. Marabelli et al. "NonFermiliquid behavior of YbCu5xAlx." Physical Review B 60, no. 2 (1999): 1238–1246.
Abstract: A valency change in YbCu5xAlx from nu approximate to 2.2(x=0) to nu=3(x=2) causes a magnetic instability near a critical concentration x(cr)approximate to 1.5 Alloys in the vicinity of x(cr) exhibit typical nonFermiliquid properties like a negative logarithmic contribution to the specific heat or substantial deviations of the electrical resistivity from a T2 behavior. Both pressure and alloying in this series bring about a strong reduction of the Kondo temperature TK; the crystalheld interaction and the interatomic exchange gain therefore importance and magnetic order becomes possible beyond x(cr).

Bauer, E., R. Hauser, H. Michor, G. Hilscher, A. Galatanu, M. Galli, J. G. Sereni, and P. Bonville. "Evolution of a nonFermiliquid state in YbCu5xAlx." Physica B 259261 (1999): 426–428.
Abstract: The growing valency of the Yb ion, when Cu is substituted by Al in YbCu5 – xAlx, causes a magnetic instability at a critical concentration x(cr) approximate to 1.5. Alloys in the vicinity of x(cr) exhibit typical nonFermiliquid properties. (C) 1999 Elsevier Science B.V. All rights reserved.

Berger, S., A. Galatanu, G. Hilscher, H. Michor, C. Paul, E. Bauer, P. Rogl, M. GomezBerisso, P. Pedrazzini, J. G. Sereni et al. "Experimental study of physical properties in the complex magnetic phase diagram of Ce(Rh1xRux)(3)B2." Physical Review B 64, no. 13 (2001): 134404.
Abstract: We report on a series of structural, magnetic, and thermodynamic measurements, a study of transport properties and xray absorption edge spectroscopy on Ce(Rh1xRux)(3)B2. These investigations evidence that in addition to the already established ferromagnetic range for x less than or equal to0.06, a complex antiferromagnetic structure exists for concentrations 0.1 less than or equal tox less than or equal to0.35. The behavior in the latter regime is dominated by an extraordinary strong intersite coupling; however, the magnetic moments involved appear to be very small. At the phase boundary to the paramagnetic regime (x approximate to0.4), significant deviations from a Fermiliquid behavior occur.

Sereni, J. G., P. Pedrazzini, E. Bauer, A. Galatanu, Y. Aoki, and H. Sato. "Detailed study of the CePd2xNixAl3 magnetic phase diagram around its critical concentration." Journal of Physics: Condensed Matter 18, no. 15 (2006): 3789–3802.
Abstract: Thermal, magnetic and transport measurements on CePd2xNixAl3 alloys within the 0 <= x <= 1 range are reported, including applied pressure (p) and magnetic field on some selected samples. The low temperature results indicate that long range antiferromagnetic order is robust up to x = 0.2, whereas between 0.25 and 0.5 magnetic fluctuations give rise to nonFermiliquid (NFL) behaviour. In this critical region, the low temperature specific heat can be described as due to two components, the major showing a NFL Cp/T = gamma(0) – gamma(1) root T dependence, while the minor one includes a decreasing fraction of short range order degrees of freedom. The latter is only observed close to the critical point, x(cr) approximate to 0.35. Electrical resistivity (rho) studies performed under pressure for x = 0.5 allow us to investigate the evolution of the NFL state around and beyond x(cr), where the exponent of rho proportional to Tn increases from n = 1 (for p = 0) up to n = 2 (for p = 12 kbar). This exponent is also observed at normal pressure on the x = 1.0 sample. indicating the onset of the Fermi liquid behaviour. Doping and pressure effects are compared by fitting high temperature resistivity data employing a unique function which allows us to describe the evolution of the characteristic energy of this series along a large range of concentration and pressure.
