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@ARTICLE{ISLAM:627002,
      author       = {ISLAM, MIJANUL and Adhikari, Sanat Kumar and Adhikari, Soma
                      and Chatterjee, Souvik and Goswami, S and De, Debajyoti and
                      Irshad, K. A. and Joseph, B. and Caliebe, Wolfgang and
                      Karmakar, Arindam},
      title        = {{C}harge conduction and relaxation in
                      {C}a$_{1−x}${D}y$_x${B}a{F}e$_4${O}$_7$},
      journal      = {Physical review / B},
      volume       = {111},
      number       = {5},
      issn         = {2469-9950},
      address      = {Woodbury, NY},
      publisher    = {Inst.},
      reportid     = {PUBDB-2025-01527},
      pages        = {054110},
      year         = {2025},
      abstract     = {The paper presents in-depth studies of the dielectric
                      properties and conduction dynamics of Dy-doped
                      CaBaFe$_4$⁢O$_7$ which is a recently characterized
                      magnetoelectric material with strong potentials for
                      technological applications as it shows a
                      near-room-temperature ferrimagnetic transition along with
                      strong ferrimagnetic moment, and gigantic electric
                      polarization change. This work demonstrates the direct
                      correlation of the dielectric and electrical transport
                      properties of Ca$_{1−𝑥}$⁢Dy$_𝑥$⁢BaFe$_4$⁢O$_7$
                      (𝑥=0, 0.01, 0.03, and 0.05) with structural distortion
                      through various dc, ac conduction, high-energy x-ray
                      diffraction studies, and modeling of the data.
                      CaBaFe$_4$⁢O$_7$ has a unique structure characterized by
                      alternate stacking of FeO4 tetrahedra in triangular and
                      kagomé layers. Large structural distortion, competing
                      magnetic interactions, exchange striction effects, and
                      possible charge ordering are expected to play a major role
                      in the dielectric and electrical properties of the material.
                      We report observation of short-range polaron hopping
                      conduction mechanism in the low-temperature regime and
                      signature of large polaronic nature of charge carriers.
                      Modeling of the electric modulus using Havriliak-Negami
                      equation points out both distribution and cooperativeness in
                      the polaron dynamics which can be correlated to the
                      interplay of structural distortion, and the background
                      electric field due to the polar nature of the materials. The
                      Havriliak-Negami parameters closely follow orthorhombic
                      distortion of the structures.},
      cin          = {DOOR ; HAS-User / FS-PET-S},
      ddc          = {530},
      cid          = {I:(DE-H253)HAS-User-20120731 /
                      I:(DE-H253)FS-PET-S-20190712},
      pnm          = {632 - Materials – Quantum, Complex and Functional
                      Materials (POF4-632) / 6G3 - PETRA III (DESY) (POF4-6G3) /
                      FS-Proposal: I-20210617 (I-20210617)},
      pid          = {G:(DE-HGF)POF4-632 / G:(DE-HGF)POF4-6G3 /
                      G:(DE-H253)I-20210617},
      experiment   = {EXP:(DE-H253)P-P64-20150101},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:001447739000003},
      doi          = {10.1103/PhysRevB.111.054110},
      url          = {https://bib-pubdb1.desy.de/record/627002},
}