Electric field gradient of Pt, Ir, Os, and Re in cubic cobalt - art. no. 054428

The electric quadrupole interaction of Re-181, Os-183, Ir-186, and Pt-191 i n polycrystal samples of cubic Co has been measured using modulated adiabat ic fast passage on oriented nuclei. The average electric field gradients of Re, Os, Ir, and Pt in cubic Co were deduced to be +0.36(26), -1.15(11), -1 .04(5), and +0.23(5) 10(16) V/cm(2), respectively. These results are compar ed with the spin-orbit induced electric field gradients of 5d impurities in Fe, Ni, and hexagonal Co. In addition the hyperfine field of Re in cubic C o has been determined to be -48.4(2) T and the difficulties in deducing the intrinsic electric field gradient from strongly inhomogeneously broadened field gradient distributions are discussed.