1305.4670 (Rafael M. Fernandes et al.)

How many quantum phase transitions exist inside the superconducting dome
of the iron pnictides?    [PDF]

Rafael M. Fernandes, Saurabh Maiti, Peter Wölfle, Andrey V. Chubukov

Recent experiments on two iron-pnictide families suggest the existence of a single quantum phase transition (QPT) inside the superconducting dome despite the fact that two separate transition lines - magnetic and nematic - cross the superconducting dome at $T_{c}$. Here we argue that these two observations are actually consistent. We show, using a microscopic model, that each order coexists with superconductivity for a wide range of parameters, and both transition lines continue into the superconducting dome below $T_{c}$. However, at some $T_{\mathrm{merge}}View original: http://arxiv.org/abs/1305.4670