paper

Physical and magnetic properties of Ba(FeRu)As single crystals

arXiv:1006.3298 · doi:10.1103/PhysRevB.82.014534

Abstract

Single crystals of Ba(FeRu)As, , have been grown and characterized by structural, magnetic and transport measurements. These measurements show that the structural/magnetic phase transition found in pure BaFeAs at 134 K is suppressed monotonically by Ru doping, but, unlike doping with TM=Co, Ni, Cu, Rh or Pd, the coupled transition seen in the parent compound does not detectably split into two separate ones. Superconductivity is stabilized at low temperatures for and continues through the highest doping levels we report. The superconducting region is dome like, with maximum T ( K) found around . A phase diagram of temperature versus doping, based on electrical transport and magnetization measurements, has been constructed and compared to those of the Ba(FeTM)As (TM=Co, Ni, Rh, Pd) series as well as to the temperature-pressure phase diagram for pure BaFeAs. Suppression of the structural/magnetic phase transition as well as the appearance of superconductivity is much more gradual in Ru doping, as compared to Co, Ni, Rh and Pd doping, and appears to have more in common with BaFeAs tuned with pressure; by plotting and as a function of changes in unit cell dimensions, we find that changed in the ratio, rather than changes in , or V, unify the and phase diagrams for BaFeAs and Ba(FeRu)As respectively.

16 pages, 10 figures

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