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@ARTICLE{Hallas:186178,
      author       = {Hallas, A. M. and Cheng, J. G. and Arevalo-Lopez,
                      A. M. and Silverstein, H. J. and Su, Y. and Sarte,
                      P. M. and Zhou, H. D. and Choi, E. S. and Attfield,
                      J. P. and Luke, G. M. and Wiebe, C. R.},
      title        = {{I}ncipient {F}erromagnetism in
                      ${\mathrm{{T}b}}_{2}{\mathrm{{G}e}}_{2}{\mathrm{{O}}}_{7}$:
                      {A}pplication of {C}hemical {P}ressure to the {E}nigmatic
                      {S}pin-{L}iquid {C}ompound
                      ${\mathrm{{T}b}}_{2}{\mathrm{{T}i}}_{2}{\mathrm{{O}}}_{7}$},
      journal      = {Physical review letters},
      volume       = {113},
      number       = {26},
      issn         = {1079-7114},
      address      = {College Park, Md.},
      publisher    = {APS},
      reportid     = {FZJ-2015-00266},
      pages        = {267205},
      year         = {2014},
      abstract     = {After nearly 20 years of study, the origin of the
                      spin-liquid state in Tb2Ti2O7 remains a challenge for
                      experimentalists and theorists alike. To improve our
                      understanding of the exotic magnetism in Tb2Ti2O7, we
                      synthesize a chemical pressure analog: Tb2Ge2O7.
                      Substitution of titanium by germanium results in a lattice
                      contraction and enhanced exchange interactions. We
                      characterize the magnetic ground state of Tb2Ge2O7 with
                      specific heat, ac and dc magnetic susceptibility, and
                      polarized neutron scattering measurements. Akin to Tb2Ti2O7,
                      there is no long-range order in Tb2Ge2O7 down to 20 mK. The
                      Weiss temperature of −19.2(1)  K, which is more
                      negative than that of Tb2Ti2O7, supports the picture of
                      stronger antiferromagnetic exchange. Polarized neutron
                      scattering of Tb2Ge2O7 reveals that liquidlike correlations
                      dominate in this system at 3.5 K. However, below 1 K, the
                      liquidlike correlations give way to intense short-range
                      ferromagnetic correlations with a length scale similar to
                      the Tb-Tb nearest neighbor distance. Despite stronger
                      antiferromagnetic exchange, the ground state of Tb2Ge2O7 has
                      ferromagnetic character, in stark contrast to the
                      pressure-induced antiferromagnetic order observed in
                      Tb2Ti2O7.},
      cin          = {JCNS (München) ; Jülich Centre for Neutron Science JCNS
                      (München) ; JCNS-FRM-II / JCNS-2 / PGI-4 / JARA-FIT},
      ddc          = {550},
      cid          = {I:(DE-Juel1)JCNS-FRM-II-20110218 /
                      I:(DE-Juel1)JCNS-2-20110106 / I:(DE-Juel1)PGI-4-20110106 /
                      $I:(DE-82)080009_20140620$},
      pnm          = {422 - Spin-based and quantum information (POF2-422) / 424 -
                      Exploratory materials and phenomena (POF2-424) / 542 -
                      Neutrons (POF2-542) / 544 - In-house Research with PNI
                      (POF2-544) / 54G - JCNS (POF2-54G24)},
      pid          = {G:(DE-HGF)POF2-422 / G:(DE-HGF)POF2-424 /
                      G:(DE-HGF)POF2-542 / G:(DE-HGF)POF2-544 /
                      G:(DE-HGF)POF2-54G24},
      experiment   = {EXP:(DE-MLZ)DNS-20140101},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000350218000027},
      doi          = {10.1103/PhysRevLett.113.267205},
      url          = {https://juser.fz-juelich.de/record/186178},
}