Hi<br>I am trying to determine the lattice parameter of hcp Co. The reported experimental results is a = 4.74 bohr c/a = 1.62 but i am getting a = 4.675 and c/a = 1.58 . I am using the GGA PP Co.pbe-nd-rrkjus.UPF which is expected to overestimate the lattice parameter as compared to LDA PP but here it is underestimating the lattice parameter by around 2%. am i doing any thing wrong or this value i should proceed with this result for my further calculation. I am attaching the input file and the plot of E vs lattice parameter. <br>
<br>Please help. Thanks in advance.<br><br>vicky singh <br>research student <br>Bangalore<br>