Ground-state order and spin-lattice coupling in tetrahedral spin systems Cu2Te2O5X2 (X=Br or Cl). Prester, M., Smontara, A., Živković, I., Bilušić, A., Drobac, Đ., Berger, H., & Bussy, F. Physical Review B, 69(18):180401, 5, 2004.
Ground-state order and spin-lattice coupling in tetrahedral spin systems Cu2Te2O5X2 (X=Br or Cl) [link]Website  abstract   bibtex   
High-resolution ac susceptibility and thermal conductivity measurement on Cu2Te2O5X2(X=Br,Cl) single crystals are reported. For Br-sample, sample dependence prevents to distinguish between possibilities of magnetically ordered and spin-singlet ground states. In Cl-sample a three-dimensional transition at 18.5 K is accompanied by almost isotropic behavior of susceptibility and almost switching behavior of thermal conductivity. Thermal conductivity studies suggest the presence of a tremendous spin-lattice coupling characterizing Cl- but not Br-sample. Below the transition Cl-sample is in a complex magnetic state involving AF order but also the elements consistent with the presence of a gap in the excitation spectrum.
@article{
 title = {Ground-state order and spin-lattice coupling in tetrahedral spin systems Cu2Te2O5X2 (X=Br or Cl)},
 type = {article},
 year = {2004},
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 pages = {180401},
 volume = {69},
 websites = {http://link.aps.org/doi/10.1103/PhysRevB.69.180401},
 month = {5},
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 abstract = {High-resolution ac susceptibility and thermal conductivity measurement on Cu2Te2O5X2(X=Br,Cl) single crystals are reported. For Br-sample, sample dependence prevents to distinguish between possibilities of magnetically ordered and spin-singlet ground states. In Cl-sample a three-dimensional transition at 18.5 K is accompanied by almost isotropic behavior of susceptibility and almost switching behavior of thermal conductivity. Thermal conductivity studies suggest the presence of a tremendous spin-lattice coupling characterizing Cl- but not Br-sample. Below the transition Cl-sample is in a complex magnetic state involving AF order but also the elements consistent with the presence of a gap in the excitation spectrum.},
 bibtype = {article},
 author = {Prester, M and Smontara, Ana and Živković, I and Bilušić, Ante and Drobac, Đ. and Berger, H and Bussy, F},
 journal = {Physical Review B},
 number = {18}
}

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