Student
Even if you find it you probably can't use it. The problem with the student edition is there is a limit on the number of nodes your simulation can have. Any component with any complexity at all (even most op-amps) has too many nodes and the student edition will not run it. At the university, when we had to use SPICE in a lab with 3 op-amps,, they gave us a really simple op-amp file with minimal nodes so we could run the simulation because a regular op-amp model had too many nodes.
That said, the best place to get PSPICE model files is to find a company that makes the component you want and search their website. Fairchild seems to make the LM35, but does not seem to have a model file.
Here is a user made one I found. It looks like it may be simple enough for the student version to use:
**broken link removed**