Evidence for a correlated insulator to antiferromagnetic metal transition in CrN.

  title={Evidence for a correlated insulator to antiferromagnetic metal transition in CrN.},
  author={Preeti A. Bhobe and A. Chainani and Munetaka Taguchi and Tomoyuki Takeuchi and Ritsuko Eguchi and M. Matsunami and Kyoko Ishizaka and Yasutaka Takata and Masaki Oura and Yasunori Senba and Hirotada Ohashi and Yoshinori Nishino and Makina Yabashi and Kenji Tamasaku and Toshiyuki Ishikawa and Koshi Takenaka and Hidenori Takagi and S. Shin},
  journal={Physical review letters},
  volume={104 23},
We investigate the electronic structure of chromium nitride (CrN) across the first-order magnetostructural transition at T(N)∼286  K. Resonant photoemission spectroscopy (PES) shows a gap in the 3d partial density of states at the Fermi level and an on-site Coulomb energy U∼4.5  eV, indicating strong electron-electron correlations. Bulk-sensitive high-resolution (6 meV) laser PES reveals a clear Fermi edge indicating an antiferromagnetic metal below T(N). Hard x-ray Cr 2p core-level PES shows T… Expand
Electronic Structure Evolution across the Peierls Metal-Insulator Transition in a Correlated Ferromagnet
Transition metal compounds often undergo spin-charge-orbital ordering due to strong electron-electron correlations. In contrast, low-dimensional materials can exhibit a Peierls transition arisingExpand
Band gap and electron transport in epitaxial cubic Cr1−xAlxN(001)
A possible metal-insulator transition in the Cr1−xAlxN alloy system is explored using electronic transport and optical measurements on epitaxial Cr1−xAlxN(001)/MgO(001) layers which form a cubicExpand
Conducting states caused by a surface electric dipole in CrN(001) very thin films
We report a series of electronic-structure calculations for CrN films within the LDA + $U$ method. In the bulk, it was found previously that with the onset of antiferromagnetic order, a gap opens andExpand
Strain-Mediated High Conductivity in Ultrathin Antiferromagnetic Metallic Nitrides.
It is found that the metallicity of an ultrathin CrN film recovers from insulating behavior upon the removal of the as-grown strain by the fabrication of freestanding nitride films. Expand
Epitaxial suppression of the metal-insulator transition in CrN
Both single- and polycrystalline CrN layers are grown by reactive sputtering on MgO and quartz substrates, respectively. Temperature-dependent x-ray diffraction indicates a phase transition near 280Expand
Complete ligand reinforcing the structure of cubic-CrN
Abstract As a typical transition metal nitride and promising spintronic material, CrN has many controversial results because of crystallographic nitrogen defects. One is the bulk softening resultingExpand
Quasiparticle self-consistent GW band structure of CrN
The band structures of CrN are calculated using the quasiparticle self-consistent $GW$ approach in both the low-temperature antiferromagnetic (AFM) [$110{\mathrm{]}}_{2}\phantom{\rule{4pt}{0ex}}Pmna$Expand
Magnetic influence on thermoelectric properties of CrO0.1N0.9
Abstract Thermoelectric polycrystalline chromium oxynitride CrO 0.09(3) N 0.90(7) (with cubic symmetry and space group Fm-3m ) samples were successfully prepared by thermal ammonolysis of chromiumExpand
Structural and electrical transport studies on CrN(001) thin films
We report the structural and electrical transport studies on CrN1-x (CrN) thin films with varying of N2 flow (5 – 25 SCCM) in an Argon environment of 25 SCCM. CrN thin films were grown at 600°C, in aExpand
Two-dimensional hexagonal CrN with promising magnetic and optical properties: A theoretical prediction.
Using first principles calculations, it is found that freestanding h-CrN has a 100% spin-polarized half-metallic nature with possible ferromagnetic ordering and a high rate of optical transparency. Expand


Electronic structure of CrN: A borderline Mott insulator
Calculations using the $\text{LSDA}+\text{U}$ (local spin-density approximation corrected by Hubbard Coulomb terms for the $d$ electrons) approach show that CrN is close to a charge-transferExpand
Metal/semiconductor phase transition in chromium nitride(001) grown by rf-plasma-assisted molecular-beam epitaxy
Structural and electronic properties of stoichiometric single-phase CrN(001) thin films grown on MgO(001) substrates by radio-frequency N plasma-assisted molecular-beam epitaxy, are investigated. InExpand
Band gap in epitaxial NaCl-structure CrN(001) layers
B1–NaCl-structure CrN(001) layers were grown on MgO(001) at 600 °C by ultrahigh vacuum reactive magnetron sputter deposition in pure N2 discharges. X-ray diffraction analyses establish the epitaxialExpand
Bulk screening in core-level photoemission from Mott-Hubbard and charge-transfer systems
We report bulk-sensitive hard x-ray shn = 5.95 keVd core-level photoemission spectroscopy sPESd of single crystal V1.98Cr0.02O3 and the high-Tc cuprate Bi2Sr2CaCu2O8+d sBi2212d .V 1.98Cr0.02O3Expand
CrN is observed to undergo a paramagnetic to antiferromagnetic transition accompanied by a shear distortion from cubic NaCl-type to orthorhombic structure. Our first-principle plane wave andExpand
Non-stoichiometry and Antiferromagnetic Phase Transition of NaCl-type CrN Thin Films Prepared by Reactive Sputtering
Non-stoichiometric CrN 1+x (0.0≤x≤0.2) thin films with a NaCl-type structure have been prepared by reactive sputtering of chromium metal target in Ar/N 2 mixed gas. Nearly stoichiometric CrN thinExpand
Localized superconductivity in the quantum-critical region of the disorder-driven superconductor-insulator transition in TiN thin films.
Findings indicate the formation of a distinct collective state of the localized Cooper pairs in the critical region at both sides of the transition, evidencing a direct superconductor-insulator transition without an intermediate metallic phase. Expand
Photoemission spectroscopic evidence of gap anisotropy in an f-electron superconductor.
The present study provides direct evidence for an anisotropic SC gap in CeRu2, and also demonstrates the potential of Laser-PES in investigating unconventional superconductivity realized in correlated d- and f-electron superconductors. Expand
Nature of the well screened state in hard X-ray Mn 2p core-level photoemission measurements of La1-xSrxMnO3 films.
Cluster model calculations including charge transfer from doping-induced states show good agreement, confirming this picture of bulk properties reflected in Mn 2p core-levels using HX PES. Expand
Superconducting properties of a textured NbN film from 93Nb NMR relaxation and magnetization measurements
Primarily motivated by the similarities between the underdoped superconducting cuprates and the granular systems in regards of electric conductivity, phase fluctuations of the order parameter, andExpand