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@ARTICLE{Ji:866007,
      author       = {Ji, W. H. and Yin, L. and Zhu, W. M. and Kumar, C. M. N.
                      and Li, Cheng and Li, H.-F. and Jin, W. T. and Nandi, S. and
                      Sun, Xiao and Su, Y. and Brückel, Th. and Lee, Y. and
                      Harmon, B. N. and Ke, L. and Ouyang, Z. W. and Xiao, Y.},
      title        = {{N}oncollinear magnetic structure and anisotropic
                      magnetoelastic coupling in cobalt pyrovanadate {C}o 2 {V} 2
                      {O} 7g4},
      journal      = {Physical review / B},
      volume       = {100},
      number       = {13},
      issn         = {2469-9950},
      address      = {Woodbury, NY},
      publisher    = {Inst.},
      reportid     = {FZJ-2019-05267},
      pages        = {134420},
      year         = {2019},
      abstract     = {Co2V2O7 was recently reported to exhibit remarkable
                      magnetic-field-induced magnetization plateaus and
                      ferroelectricity [R. Chen et al., Phys. Rev. B 98, 184404
                      (2018)], but its magnetic ground state remains ambiguous.
                      Magnetometry measurements and time-of-flight neutron powder
                      diffraction (NPD) have been employed to study the structural
                      and magnetic properties of Co2V2O7, which includes two
                      nonequivalent Co sites. Upon cooling below the Néel
                      temperature TN=6.0(2) K, we observe magnetic Bragg peaks at
                      2 K in NPD, which indicates the formation of long-range
                      magnetic order of Co2+ moments. After symmetry analysis and
                      magnetic structure refinement, we demonstrate that Co2V2O7
                      possesses a complicated noncollinear magnetic ground state
                      with Co moments mainly located in the b-c plane and forming
                      a noncollinear spin-chain-like structure along the c-axis.
                      The ab initio calculations demonstrate that the noncollinear
                      magnetic structure is more stable than various ferromagnetic
                      states at low temperature. The noncollinear magnetic
                      structure with a canted ↑↑↓↓ spin configuration is
                      considered to be the origin of magnetoelectric coupling in
                      Co2V2O7 because the inequivalent exchange striction induced
                      by the spin-exchange interaction between the neighboring
                      spins could be the driving force of ferroelectricity. It is
                      also found that the deviation of lattice parameters a and b
                      is opposite below TN, while the lattice parameter c and β
                      stay almost constant below TN, evidencing the anisotropic
                      magnetoelastic coupling in Co2V2O7.},
      cin          = {JCNS-2 / PGI-4 / JARA-FIT / JCNS-FRM-II},
      ddc          = {530},
      cid          = {I:(DE-Juel1)JCNS-2-20110106 / I:(DE-Juel1)PGI-4-20110106 /
                      $I:(DE-82)080009_20140620$ /
                      I:(DE-Juel1)JCNS-FRM-II-20110218},
      pnm          = {144 - Controlling Collective States (POF3-144) / 524 -
                      Controlling Collective States (POF3-524) / 6212 - Quantum
                      Condensed Matter: Magnetism, Superconductivity (POF3-621) /
                      6213 - Materials and Processes for Energy and Transport
                      Technologies (POF3-621) / 6G4 - Jülich Centre for Neutron
                      Research (JCNS) (POF3-623)},
      pid          = {G:(DE-HGF)POF3-144 / G:(DE-HGF)POF3-524 /
                      G:(DE-HGF)POF3-6212 / G:(DE-HGF)POF3-6213 /
                      G:(DE-HGF)POF3-6G4},
      experiment   = {EXP:(DE-MLZ)External-20140101},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000489820500006},
      doi          = {10.1103/PhysRevB.100.134420},
      url          = {https://juser.fz-juelich.de/record/866007},
}