MIMAS, hosts of WoK, are having technical difficulties at the moment.
To get into WoK and the resources on it please go to http://www.isiknowledge.com
Select the first University of Edinburgh option from the list of home organisations.
More resources for finding academic physics literature by subject
The WoK entry from the above URL links to an access route which works. Supplied after "Still not working?" - select UK Federation from the options then UoEdinburgh etc.