2016/01/26 by Ji-Hoon Kang, Soon-Gil Jung, Sangyun Lee +5
Materials Science · Physics and Astronomy · #Antiferromagnetism #Critical field #Electrical resistivity and conductivity #Field (mathematics) #Iron-based superconductors research #Magnetic and transport properties of perovskites and related materials #Magnetic field #Magnetoresistance #Phase (matter) #Physics of Superconductivity and Magnetism #Superconductivity #cond-mat.supr-con
paper · pdf · doi:10.1088/0953-2048/29/3/035007
published as Supercond. Sci. Technol. 29 (2016) 035007 · 23 pages, 6 figures, 1 table
openalex publication_date 2016/01/26 · arxiv created 2016/02/12 · arxiv updated 2016/02/15 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
We investigate the pressure dependence of the upper critical fields ( μ 0 H c2 ) 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 T c for pressures higher than 1.2 GPa, while it is absent for H // ab . Since the measured μ 0 H c2 for FeSe samples is smaller than the orbital limited upper critical field 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 μ 0 H c2 ( 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 μ 0 H c2 (0) for the FeSe single crystals is found to be almost similar to that of T c ( P ), suggesting that the pressure-induced magnetic order adversely affects the upper critical fields as well as the SC transition temperature.