Blender Internal and Cycles are two different render engines for Blender. Cycles is newer, more advanced and more commonly used. Blender does not come with any "pre-built" Cycles material libraries if that's what you are asking. It does come with the base shaders needed to create any material you can imagine, but it would be up to you the user to build your own materials from scratch or to accumulate material libraries from other sources. Fortunately, there are many tutorials out there to show you how to create just about any material you could want in Cycles from scratch, or you can download materials from any of the repository sites. Some materials are free, but some are paid. Here's a few links:

150 Free Cycles Shaders - Blender Nation https://www.blendernation.com/2015/09/29/150-free-cycles-shaders/

BlendSwap - You can find both materials and blend files for download here http://www.blendswap.com/

Cycles Material Vault - NOT a free resource, so I will not directly link to the site but if you're willing to join they do have some very good Cycles materials. https://www.cyclesmaterialvault.com/

The meta-androcto is a material library collected for Cycles from the community on Blendswap. You must log in to download. http://www.blendswap.com/blends/view/56470

Hopefully this will help get you started.

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