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[Matthieu Verstraete <mjv500@york.ac.uk>]

You might try a "nicer" pseudopotential (TM typically). This would also 
enable you to use GGA, which is important for many d band metals, and to 
(perhaps) lower the cutoff.

Are you using the semicore psp? In that case your ecut may not even be 
converged at 50.

I'm surprised the iscf 7 doesn't work for lin resp. Mark is this correct? 
Maybe, but maybe you have added options, like iprcel, which are 
incompatible (once again, netiquette! Send the input, specify 
architecture, version, etc...)

If worst comes to worst, you should be able to make it converge (slowly) 
with iscf 3, by playing with the diemix/diemac. Especially for bulk 
systems like this, I have never encountered a permanently pathological 
system.

Matthieu

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Dr. Matthieu Verstraete                 mailto:mjv500@york.ac.uk
Dept. of Physics, University of York,     tel: +44 1904 43 22 08
Heslington, YO10 5DD York, United Kingdom fax: +44 1904 43 22 14