Infrared evidence of a Slater metal-insulator transition in NaOsO3

نویسندگان

  • I. Lo Vecchio
  • A. Perucchi
  • P. Di Pietro
  • O. Limaj
  • U. Schade
  • Y. Sun
  • M. Arai
  • K. Yamaura
  • S. Lupi
چکیده

The magnetically driven metal-insulator transition (MIT) was predicted by Slater in the fifties. Here a long-range antiferromagnetic (AF) order can open up a gap at the Brillouin electronic band boundary regardless of the Coulomb repulsion magnitude. However, while many low-dimensional organic conductors display evidence for an AF driven MIT, in three-dimensional (3D) systems the Slater MIT still remains elusive. We employ terahertz and infrared spectroscopy to investigate the MIT in the NaOsO₃ 3D antiferromagnet. From the optical conductivity analysis we find evidence for a continuous opening of the energy gap, whose temperature dependence can be well described in terms of a second order phase transition. The comparison between the experimental Drude spectral weight and the one calculated through Local Density Approximation (LDA) shows that electronic correlations play a limited role in the MIT. All the experimental evidence demonstrates that NaOsO₃ is the first known 3D Slater insulator.

برای دانلود رایگان متن کامل این مقاله و بیش از 32 میلیون مقاله دیگر ابتدا ثبت نام کنید

ثبت نام

اگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید

منابع مشابه

Metal-insulator transition in the low-dimensional organic conductor (TMTSF)2FSO3 probed by infrared microspectroscopy

We present measurements of the infrared response of the quasi-one-dimensional organic conductor (TMTSF)2FSO3 along (E‖a) and perpendicular (E‖b ′) to the stacking axis as a function of temperature. Above the metal-insulator transition related to the anion ordering the optical conductivity spectra show a Drude-like response. Below the transition an energy gap of about 1500 cm (185 meV) opens, le...

متن کامل

Searching for the Slater transition in the pyrochlore Cd2Os2O7 with infrared spectroscopy

Infrared reflectance measurements were made on the single crystal pyrochlore Cd2Os2O7 in order to examine the transformations of the electronic structure and crystal lattice across the boundary of the metal-insulator transition ~MIT! at TMIT5226 K. All predicted IR active phonons are observed in the conductivity over all temperatures and the oscillator strength is found to be temperature indepe...

متن کامل

Dynamical Mean Field Theory of the Antiferromagnetic Metal to Antiferromagnetic Insulator Transition

We study the zero temperature antiferromagnetic metal to antiferromagnetic insulator transition using dynamical mean field theory and exact diagonalization methods. We find two qualitatively different behaviors depending on the degree of magnetic correlations. For strong correlations combined with magnetic frustration, the transition can be described in terms of a renormalized Slater theory, wi...

متن کامل

Observation of a metal-to-insulator transition with both Mott-Hubbard and Slater characteristics in Sr2IrO4 from time-resolved photocarrier dynamics

We perform a time-resolved optical study of Sr2IrO4 to understand the influence of magnetic ordering on the low energy electronic structure of a strongly spin-orbit coupled Jeff = 1/2Mott insulator. By studying the recovery dynamics of photoexcited carriers, we find that upon cooling through the Néel temperature TN the system evolves continuously from a metal-like phase with fast (∼50 fs) and e...

متن کامل

خواص ساختاری، الکتریکی و مغناطیسی منگنایتLa1-xCaxMnO3

  Manganites are considered as subbranches of condensed matter physics with a great wealth of physical mechanisms. In this investigation we have studied the structural, electrical and magnetic properties of a series of La1-xCaxMnO3   manganite with x=0.1, 0.2, …,0.5. We observed that the crystal structure of this manganite, with small dopping, at room temperature is orthorhombic and by increasi...

متن کامل

ذخیره در منابع من


  با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید

عنوان ژورنال:

دوره 3  شماره 

صفحات  -

تاریخ انتشار 2013