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@ARTICLE{Bhobe:276651,
      author       = {Bhobe, P. A. and Kumar, A. and Taguchi, M. and Eguchi, R.
                      and Matsunami, M. and Takata, Y. and Nandy, Ashis Kumar and
                      Mahadevan, P. and Sarma, D. D. and Neroni, A. and
                      Şaşıoğlu, E. and Ležaić, M. and Oura, M. and Senba, Y.
                      and Ohashi, H. and Ishizaka, K. and Okawa, M. and Shin, S.
                      and Tamasaku, K. and Kohmura, Y. and Yabashi, M. and
                      Ishikawa, T. and Hasegawa, K. and Isobe, M. and Ueda, Y. and
                      Chainani, A.},
      title        = {{E}lectronic {S}tructure {E}volution across the {P}eierls
                      {M}etal-{I}nsulator {T}ransition in a {C}orrelated
                      {F}erromagnet},
      journal      = {Physical review / X},
      volume       = {5},
      number       = {4},
      issn         = {2160-3308},
      address      = {College Park, Md.},
      publisher    = {APS},
      reportid     = {FZJ-2015-06979},
      pages        = {041004},
      year         = {2015},
      abstract     = {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 arising from low-energy
                      electron-phonon-coupling-induced structural instabilities.
                      We study the electronic structure of the tunnel framework
                      compound K2Cr8O16, which exhibits a temperature-dependent
                      (T-dependent) paramagnetic-to-ferromagnetic-metal transition
                      at TC=180  K and transforms into a ferromagnetic
                      insulator below TMI=95  K. We observe clear T-dependent
                      dynamic valence (charge) fluctuations from above TC to TMI,
                      which effectively get pinned to an average nominal valence
                      of Cr+3.75 (Cr4+∶Cr3+ states in a 3∶1 ratio) in the
                      ferromagnetic-insulating phase. High-resolution laser
                      photoemission shows a T-dependent BCS-type energy gap, with
                      2G(0)∼3.5(kBTMI)∼35  meV. First-principles
                      band-structure calculations, using the experimentally
                      estimated on-site Coulomb energy of U∼4  eV, establish
                      the necessity of strong correlations and finite structural
                      distortions for driving the metal-insulator transition. In
                      spite of the strong correlations, the nonintegral occupancy
                      (2.25 d−electrons/Cr) and the half-metallic ferromagnetism
                      in the t2g up-spin band favor a low-energy Peierls
                      metal-insulator transition.},
      cin          = {IAS-1 / PGI-1 / JARA-FIT},
      ddc          = {530},
      cid          = {I:(DE-Juel1)IAS-1-20090406 / I:(DE-Juel1)PGI-1-20110106 /
                      $I:(DE-82)080009_20140620$},
      pnm          = {142 - Controlling Spin-Based Phenomena (POF3-142)},
      pid          = {G:(DE-HGF)POF3-142},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000362489800001},
      doi          = {10.1103/PhysRevX.5.041004},
      url          = {https://juser.fz-juelich.de/record/276651},
}