Pressure dependence of upper critical fields in FeSe single crystalsстатья
Статья опубликована в высокорейтинговом журнале
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Дата последнего поиска статьи во внешних источниках: 20 апреля 2016 г.
Аннотация:We investigate the pressure dependence of the upper critical fields (μ0Hc2) for FeSe single
crystals with pressure up to 2.57 GPa. The superconducting (SC) properties show a disparate
behavior across a critical pressure where the pressure-induced antiferromagnetic phase coexists
with superconductivity. The magnetoresistance for H//ab and H//c is very different: for H//c,
magnetic field induces and enhances a hump in the resistivity close to the Tc for pressures higher
than 1.2 GPa, while it is absent for H//ab. Since the measured μ0Hc2 for FeSe samples is smaller
than the orbital limited upper critical field Horb ( c2) estimated by the Werthamer, Helfand and
Hohenberg model, the Maki parameter (α) related to Pauli spin-paramagnetic effects is
additionally considered to describe the temperature dependence of μ0Hc2(T). Interestingly, the
α value is hardly affected by pressure for H//ab, while it strongly increases with pressure for
H//c. The pressure evolution of the μ0Hc2(0) for the FeSe single crystals is found to be almost
similar to that of Tc(P), suggesting that the pressure-induced magnetic order adversely affects the
upper critical fields as well as the SC transition temperature.