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The location of the pseudopotential libraries

In this BLOCK the user tells CASTEP where the pseudopotentials can be found

$ \begin{array}{ccc}
XX_{1} or I_{1} & <filename> \\
\vdots & \vdots \\
XX_{n} or I_{n} & <filename>

The species symbol/atomic number must be consistent with that in the IONIC_POSITIONS block and the SPECIES_MASS block. If the pseudopotential files are contained in a working directory then only the filename is specified. If the user is working on a shared machine such as a cluster in which the pseudopotentials are kept in a library for access by multiple users then the full directory path must be specified.