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We studied the effect of hydrostatic pressure (P) on the structural phasetransitions and superconductivity in the ternary and pseudo-ternary ironarsenides CaFe2As2, BaFe2As2, and (Ba0.55K0.45)Fe2As2, by means of measurementsof electrical resistivity (rho) in the 1.8 - 300 K temperature (T) range,pressures up to 20 kbar, and magnetic fields up to 9 T. CaFe2As2 and BaFe2As2(lightly doped with Sn) display structural phase transitions near 170 K and 85K, respectively, and do not exhibit superconductivity in ambient pressure,while K-doped (Ba0.55K0.45)Fe2As2 is superconducting for T < 30 K. The effectof pressure on BaFe2As2 is to shift the onset of the crystallographictransformation down in temperature at the rate of about -1.04 K/kbar, whileshifting the whole rho(T) curves downward, whereas its effect onsuperconducting (Ba0.55K0.45)Fe2As2 is to shift the onset of superconductivityto lower temperatures at the rate of about -0.21 K/kbar. The effect of pressureon CaFe2As2 is first to suppress the crystallographic transformation and inducesuperconductivity with onset near 12 K very rapidly, i.e., for P < 5 kbar.However, higher pressures bring about another phase transformationcharacterized by reduced resistivity, and the suppression of superconductivity,confining superconductivity to a narrow pressure dome centered near 5 kbar.Upper critical field (Hc2) data in (Ba0.55K0.45)Fe2As2 and CaFe2As2 arediscussed.

physica b condensed matter

Hydrostatic pressure study of the structural phase transitions and  superconductivity in single crystals of (Ba1-xKx)Fe2As2 (x = 0 and 0.45) and  CaFe2As2