2011/08/31 by Igor Zaliznyak, I. A. Zaliznyak, Zhi Xu +13 · 1 citation
Chemistry · Materials Science · Physics and Astronomy · #Chemistry #Condensed matter physics #Crystal structure #Crystallography #Diffraction #Iron-based superconductors research #Lattice (music) #Magnetic and transport properties of perovskites and related materials #Magnetic field #Materials science #Neutron diffraction #Optics #Phase (matter) #Phase transition #Physics #Quantum mechanics #Rare-earth and actinide compounds #Scattering #cond-mat.mtrl-sci #cond-mat.str-el #cond-mat.supr-con
paper · pdf · doi:10.1103/physrevb.85.085105
published as Phys. Rev. B 85, 085105 (2012) · revised resubmission, 8 pages, 5 figures
arxiv created 2011/12/01 · openalex publication_date 2012/02/13 · arxiv updated 2012/02/14 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
We report a sequence of continuous phase transformations in iron telluride, Fe1+yTe with y=0.10(1), which is observed by combining neutron diffraction, magnetic susceptibility, and specific-heat measurements on single-crystal samples. While a gradual increase of magnetic scattering near the wave vector (0.5,0,0.5) is seen below T\ensuremath≈70 K, a temperature where the discontinuous first-order magnetostructural phase transition is found in systems with small y (\ensuremath\lesssim0.06), the reduction of the lattice symmetry in Fe1.1Te only occurs at Ts\ensuremath≈63 K. Below TN\ensuremath≈57.5 K, the long-range magnetic order develops, the incommensurate wave vector Qm of which varies with temperature. Finally, at Tm\ensuremath\lesssim45 K, the system enters the low-T phase, where Qm is locked at \ensuremath≈(0.48,0,0.5). We conclude that these instabilities are weak compared to the strength of the underlying interactions, and we suggest that the impact of the Fe interstitials on the transitions can be treated with random-field models.