It is called contrastive focus reduplication in one popular analysis (Ghomeshi et al (2004)Ghomeshi et al (2004)). Scholars in the same analysis also refer to it as a double-construction. In Lee (2006), you will see the type of intonation on the first instance of the repeated word ("B accent") referred to as a case of contrastive topic. Both papers are nice reads if you're into that sort of thing.