Superconductivity in high-entropy alloy system containing Th.

Th-containing superconducting high entropy system with the nominal composition (NbTa)[Formula: see text](MoWTh)[Formula: see text] was synthesized. Its structural and physical properties were investigated by X-ray diffraction, scanning electron microscopy, energy dispersive X-ray spectroscopy, specific heat, resistivity and magnetic measurements. Two main phases of alloy were observed: major bcc structure and minor fcc.

Point-contact spectroscopy of heavy fermion superconductors CePdInand CePdInin comparison with CeCoIn.

We report point-contact spectroscopy measurements on heavy fermion cousins CeCoIn, CePdInand CePdInto systematically study the hybridization betweenand conduction electrons. Below a temperature*, the spectrum of each compound exhibits an evolving Fano-like conductance shape, superimposed on a sloping background, that suggests the development of hybridization between localand itinerant conduction electrons in the coherent heavy fermion state below*. We present a quantitative analysis of the conductance curves with a two-channel model to compare the tunneling process between normal metallic silver particles in our soft point-contact and heavy-fermion single crystals CeCoIn, CePdInand CePdIn.

Antiferromagnetic Ordering and Transport Anomalies in Single-Crystalline CeAgAs.

Single crystals of the ternary cerium arsenide CeAgAs were grown by chemical vapor transport. They were studied by means of x-ray diffraction, magnetization, heat capacity and electrical transport measurements. The experimental research was supplemented with electronic band structure calculations.

Magnetic field-driven quantum criticality in antiferromagnetic CePtIn.

Physics of the quantum critical point is one of the most perplexing topics in current condensed-matter physics. Its conclusive understanding is forestalled by the scarcity of experimental systems displaying novel aspects of quantum criticality. We present comprehensive experimental evidence of a magnetic field-tuned tricritical point separating paramagnetic, antiferromagnetic, and metamagnetic phases in the compound CePtIn Analyzing field variations of its magnetic susceptibility, magnetoresistance, and specific heat at very low temperatures, we trace modifications of the antiferromagnetic structure of the compound.

Magnetic field driven complex phase diagram of antiferromagnetic heavy-fermion superconductor CePtIn.

We present the results of our comprehensive investigation on the antiferromagnetic heavy-fermion superconductor CePtIn carried out by means of electrical transport, heat capacity and ac magnetic susceptibility measurements, performed on single-crystalline specimens down to 50 mK in external magnetic fields up to 9 T. Our experimental results elucidate a complex magnetic field - temperature phase diagram which contains both first- and second-order field-induced magnetic transitions and highlights the emergence of field stabilized phases. Remarkably, a prominent metamagnetic transition was found to occur at low temperatures and strong magnetic fields.