We report in-plane electrical resistivity studies of CeCuBi and LaCuBi single crystals under applied pressure. At ambient pressure, CeCuBi is a c-axis Ising antiferromagnet with a transition temperature [Formula: see text] K. In a magnetic field applied along the c-axis at [Formula: see text] K a spin-flop transition takes place [Formula: see text] T. Applying pressure on CeCuBi suppresses T at a slow rate. [Formula: see text] extrapolates to zero temperature at [Formula: see text] GPa. The critical field of the spin-flop transition [Formula: see text] displays a maximum of 6.8 T at [Formula: see text] GPa. At low temperatures, a zero-resistance superconducting state emerges upon the application of external pressure having a maximum T of 7 K at 2.6 GPa in CeCuBi. High-pressure electrical-resistivity experiments on the non-magnetic reference compound LaCuBi reveal also a zero resistance state with similar critical temperatures in the same pressure range as CeCuBi. The great similarity between the superconducting properties of both materials and elemental Bi suggests a common origin of the superconductivity. We discuss that the appearance of this zero resistance state superconductivity may be related to the Bi layers present in the crystalline structure of both compounds and, therefore, could be intrinsic to CeCuBi and LaCuBi, however further experiments under pressure are necessary to clarify this issue.
The pressure evolution of the magnetic properties of the Ce 2 RhIn 7.79 Cd 0.21 heavy fermion compound was investigated by single crystal neutron magnetic diffraction and electrical resistivity experiments under applied pressure. From the neutron magnetic diffraction data, up to P = 0.6 GPa, we found no changes in the magnetic structure or in the ordering temperature T N = 4.8 K.
In this work we report the growth and characterization of single crystals of the intermetallic compound YbCd1-xSb2. This compound was synthesized with different Cd concentrations, using the Sb self-flux technique. Magnetic susceptibility as a function of temperature and applied field, electrical resistivity, specific heat and x-ray powder diffraction measurements were performed to characterize the physical properties of our single crystals. The results suggest an AFM phase with Tn ~ 3 K and heavy-fermion behavior. In order to understand the role of the CEF effects in the properties of this system, we have also performed preliminary studies of CEF effects. Finally, we discuss the magnetism and other physical properties of the YbCdSb2 compound based in the Cd stoichiometry dependency and CEF effects.
We report the electronic and magnetic properties of stoichiometric CeAuBi2 single crystals. At ambient pressure, CeAuBi2 orders antiferromagnetically below a Néel temperature (TN) of 19 K. Neutron diffraction experiments revealed an antiferromagnetic propagation vectorτ = [0, 0, 1/2], which doubles the paramagnetic unit cell along the c-axis. At low temperatures several metamagnetic transitions are induced by the application of fields parallel to the c-axis, suggesting that the magnetic structure of CeAuBi2 changes as a function of field. At low temperatures, a linear positive magnetoresistance may indicate the presence of band crossings near the Fermi level. Finally, the application of external pressure favors the antiferromagnetic state, indicating that the 4f electrons become more localized.
In this study we present the results of synthesis and characterization of single crystals of the antiferromagnetic intermetallic compound YMn2, unalloyed and with chemical substitutions, using a Sn-flux technique. In particular, we inspect the effects of Cu chemical substitutions in the Mn site of YMn2, and investigate the Cu-concentration dependence of the magnetic properties of this compound. Comparing our results to previous ones, we discuss the interplay between its doping induced properties.
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