N. O. Moreno

Magnetic structure of CeRhIn5 as a function of pressure and temperature

We report magnetic neutron-diffraction and electrical resistivity studies on single crystals of the heavy-fermion antiferromagnet CeRhIn

Multiple phase transitions in Ce(Rh,Ir,Co)In5

_{5}

Magnetism and unconventional superconductivity in CenMmIn3n+2m heavy-fermion crystals

at pressures up to 2.3 GPa. These experiments show that the staggered moment of Ce and the incommensurate magnetic structure change weakly with applied pressure up to 1.63 GPa, where resistivity, specific heat and NQR measurements confirm the presence of bulk superconductivity. This work places new constraints on an interpretation of the relationship between antiferromagnetism and unconventional superconductivity in CeRhIn

Intersite coupling effects in a kondo lattice.

_{5}

Coexistence of antiferromagnetic order and unconventional superconductivity in heavy-fermion CeRh1-xIrxIn5 compounds: Nuclear quadrupole resonance studies

.

Crystalline electric field effects in Ce M In 5 ( M = Co , Rh , Ir ) : Superconductivity and the influence of Kondo spin fluctuations

Magnetic susceptibility, electrical resistivity and heat capacity data for single crystals of Ce(Rh,Ir)1-x(Co,Ir)xIn5 (0 < x < 1) have allowed us to construct a detailed phase diagram for this new family of heavy-fermion superconductors(HFS). CeRh1-xIrxIn5 displays superconductivity(SC) (Tc < 1 K) over a wide range of composition, which develops out of and coexists (0.30 < x < 0.5) with a magnetically ordered state, with TN ~ 4 K. For CeCo1-xRhxIn5, the superconducting state (Tc ~ 2.3 K for x = 0) becomes a magnetic state (TN ~ 4 K, for x = 1) with two phase transitions observed for 0.40 < x < 0.25. CeCo1-xIrxIn5 also shows two transitions for 0.30 < x < 0.75. For those alloys in which SC is found, a roughly linear relationship between Tc and the lattice parameter ratio c/a, was found, with composition as the implicit parameter. The interplay between magnetism and SC for CeRh1-x(Ir,Co)xIn5 and the possibility of two distinct superconducting states in CeCo1-xIrxIn5 are discussed.

Novel coexistence of superconductivity with two distinct magnetic orders.

Abstract We review magnetic, superconducting and non-Fermi-liquid properties of the structurally layered heavy-fermion compounds Ce n M m In 3n+2m ( M = Co , Rh , Ir ) . These properties suggest d-wave superconductivity and proximity to an antiferromagetic quantum-critical point.

Neutron scattering study of crystal fields in CeRhIn5

The La dilution of the Kondo lattice CeCoIn5 is studied. The scaling laws found for the magnetic susceptibility and the specific heat reveal two well-separated energy scales, corresponding to the single-impurity Kondo temperature T(K) and an intersite spin-liquid temperature T(*). The Ce-dilute alloy has the expected Fermi liquid ground state, while the specific heat and resistivity in the dense Kondo regime exhibit non-Fermi-liquid behavior, which scales with T(*). These observations indicate that the screening of the magnetic moments in the lattice involves antiferromagnetic intersite correlations with a larger energy scale in comparison with the Kondo impurity case.

Structurally tuned superconductivity in heavy-fermion CeMIn5 (MCo, Ir, Rh)

We present a systematic

Physical properties of Ce2(Rh,Ir)1−xCoxIn8

^{115}\mathrm{In}