2018/12/31 by J G Vale, J. G. Vale, S. Boseggia +13
Materials Science · Physics and Astronomy · #Advanced Condensed Matter Physics #Antiferromagnetism #Critical exponent #Critical phenomena #Electronic and Structural Properties of Oxides #Ising model #Phase transition #Physics of Superconductivity and Magnetism #Rounding #Specific heat #Universality (dynamical systems) #cond-mat.str-el
paper · pdf · doi:10.1088/1361-648x/ab0471
Accepted in Journal of Physics: Condensed Matter
openalex created_date 2018/12/22 · arxiv created 2019/02/04 · openalex publication_date 2019/02/05 · arxiv updated 2019/03/27 · openalex updated_date 2026/08/06
X-ray magnetic critical scattering measurements and specific heat measurements were performed on the perovskite iridate . We find that the magnetic interactions close to the Néel temperature are three-dimensional. This contrasts with previous studies which suggest two-dimensional behaviour like Sr 2 IrO 4 . Violation of the Harris criterion ( ) means that weak disorder becomes relevant. This leads a rounding of the antiferromagnetic phase transition at , and modifies the critical exponents relative to the clean system. Specifically, we determine that the critical behaviour of is representative of the diluted 3D Ising universality class.