2017/05/31 by Dongliang Gong, Zhaoyu Liu, Yanhong Gu +6
Business, Management and Accounting · Materials Science · Physics and Astronomy · #Antiferromagnetism #Condensed matter physics #Doping #Intellectual Capital and Performance Analysis #Iron-based superconductors research #Liquid crystal #Magnetic susceptibility #Materials science #Order (exchange) #Physics #Rare-earth and actinide compounds #cond-mat.supr-con
paper · pdf · doi:10.1103/physrevb.96.104514
published as Phys. Rev. B 96, 104514 (2017) · 5 pages, 4 figures
openalex created_date 2017/05/26 · openalex publication_date 2017/09/27 · arxiv created 2017/10/11 · arxiv updated 2017/10/12 · openalex updated_date 2026/08/05
We have systematically studied the antiferromagnetic and nematic transitions in Sr_1\ensuremath-xBaxFe1.97Ni0.03As2 by magnetic susceptibility and uniaxial-pressure resistivity measurements, respectively. The derivatives of the temperature dependence of both magnetic and nematic susceptibilities show clearly sharp peaks when the transitions are first order. Accordingly, we show that while both of the magnetic and nematic transitions change from first-order to second-order with increasing Barium doping level, there is a narrow doping range where the former becomes second order but the latter remains first order, which has never been realized before in other systems. Moreover, the antiferromagnetic and nematic transition temperatures become different and the jump of nematic susceptibility becomes small in this intermediate doping range. Our results provide key information on the interplay between magnetic and nematic transitions. Concerning the current debate on the microscopic models for nematicity in iron-based superconductors, these observations agree with the magnetic scenario for an itinerant fermionic model.