Superconducting pairing symmetry in iron pnictides

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We have studied both superconducting state and normal state of iron pnictides in order to understand the whole phase diagram. We have found that the structure phase transition can be explained by the orbital fluctuations, which are induced by the electron-phonon interaction and the vertex corrections (higher order terms) of the Coulomb interaction. The orbital fluctuations favor a superconducting gap function that has no sign change. We have also found that anomalous temperature dependence of transition phenomena is explained by the orbital fluctuations.