A Quenched Disorder in the Quantum-Critical Superconductor CeCoIn.

Emergent inhomogeneous electronic phases in metallic quantum systems are crucial for understanding high-T superconductivity and other novel quantum states. In particular, spin droplets introduced by nonmagnetic dopants in quantum-critical superconductors (QCSs) can lead to a novel magnetic state in superconducting phases. However, the role of disorders caused by nonmagnetic dopants in quantum-critical regimes and their precise relation with superconductivity remain unclear.

Transport and calorimetry study of 20% La-doped CeIn.

CeIn, a prototypical antiferromagnet, is an ideal candidate for investigating the relationship between magnetism and superconductivity, as superconductivity is induced as the magnetic transition temperature (T ) is lowered to 0 K by applying pressure. When La is substituted for Ce, T of CeIn decreases to 0 K owing to the Ce dilution effects, thereby providing an alternative route to the zero-temperature quantum phase transition. In this study, we report a combinatorial approach to gain access to the critical point by applying external pressure to 20% La-doped CeIn.

Author Correction: A peak in the critical current for quantum critical superconductors.

An amendment to this paper has been published and can be accessed via a link at the top of the paper.

A peak in the critical current for quantum critical superconductors.

Generally, studies of the critical current I are necessary if superconductors are to be of practical use, because I sets the current limit below which there is a zero-resistance state. Here, we report a peak in the pressure dependence of the zero-field I, I(0), at a hidden quantum critical point (QCP), where a continuous antiferromagnetic transition temperature is suppressed by pressure toward 0 K in CeRhIn and 4.4% Sn-doped CeRhIn.

Thermal annealing and pressure effects on BaFe Co As single crystals.

We investigate the pressure and thermal annealing effects on BaFe Co As (Co-Ba122) single crystals with x  =  0.1 and 0.17 via electrical transport measurements.

An FBG Optical Approach to Thermal Expansion Measurements under Hydrostatic Pressure.

We report on an optical technique for measuring thermal expansion and magnetostriction at cryogenic temperatures and under applied hydrostatic pressures of 2.0 GPa. Optical fiber Bragg gratings inside a clamp-type pressure chamber are used to measure the strain in a millimeter-sized sample of CeRhIn₅.