Abstract
Electron-doped has been systematically studied by high-pressure investigations of the magnetic and electrical transport properties in order to unravel the complex interplay of superconductivity and magnetism. The compound reveals an exceedingly broad reentrant transition to the superconducting state between K and K due to a canted A-type antiferromagnetic ordering of the moments at K and a reentrant spin glass transition at K. At ambient pressure evidences for the coexistence of superconductivity and ferromagnetism could be observed, as well as a magnetic-field-induced enhancement of the zero-resistance temperature up to 7.2 K with small magnetic fields applied parallel to the plane of the crystal. We attribute the field-induced-enhancement of superconductivity to the suppression of the ferromagnetic component of the moments along the axis, which leads to a reduction of the orbital-pair-breaking effect. Application of hydrostatic pressure suppresses the superconducting state around 14 kbar along with a linear temperature dependence of the resistivity, implying that a non-Fermi liquid region is located at the boundary of the superconducting phase. At intermediate pressure, an additional feature in the resistivity curves is identified, which can be suppressed by external magnetic fields and competes with the superconducting phase. We suggest that the effect of negative pressure by the chemical Rh substitution in is partially reversed, leading to a reactivation of the spin density wave.
6 More- Received 21 March 2017
- Revised 2 May 2017
DOI:https://doi.org/10.1103/PhysRevB.95.195146
©2017 American Physical Society