1306.6871 (H. Meier et al.)

Effect of the magnetic field on the competition between
superconductivity and quadrupole density wave below the pseudogap state    [PDF]

H. Meier, M. Einenkel, C. Pépin, K. B. Efetov

We theoretically investigate the T-B phase diagram of cuprates building on the SU(2) pseudogap order recently obtained from the spin-fermion model. At low temperatures, our analysis reveals an almost temperature-independent critical magnetic field B_{QDW} at which d-wave superconductivity switches to the quadrupole density wave (QDW) phase. For temperatures beyond a certain value of the order of the zero-field superconducting transition temperature T_c, the critical field B_{QDW}(T) sharply grows. We compare our results derived within the effective SU(2) non-linear sigma-model with the phase diagram recently obtained by sound velocity measurements by LeBoeuf et al. (2013).

View original: http://arxiv.org/abs/1306.6871