Hydrostatic pressure (8 GPa) dependence of electrical resistivity of BaCo2As2 single crystal

The pressure dependence of the electrical resistivity of BaCo2As2 single crystal as a function of temperature was measured at ambient and high pressures up to 8 GPa for the first time using cubic anvil high pressure cell. It is observed that at room temperature the resistivity monotonically decreases with increasing pressure and it remains in the metallic state even at an applied pressure of 8 GPa. From the temperature dependence of the resistivity measurements under pressure, we found that superconductivity is absent up to 8 GPa. The value of the electronʹs scattering factor (A) is found to be large at ambient pressure and it decreases with the application of pressure, indicating that the substantial electron correlation effect of BaCo2As2 is reduced under pressure, revealing a dramatic change of density of states at the Fermi energy.