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High-resolution ac susceptibility and thermal conductivity measurement onCu2Te2O5X2(X=Br,Cl) single crystals are reported. For Br-sample, sampledependence prevents to distinguish between possibilities of magneticallyordered and spin-singlet ground states. In Cl-sample a three-dimensionaltransition at 18.5 K is accompanied by almost isotropic behavior ofsusceptibility and almost switching behavior of thermal conductivity. Thermalconductivity studies suggest the presence of a tremendous spin-lattice couplingcharacterizing Cl- but not Br-sample. Below the transition Cl-sample is in acomplex magnetic state involving AF order but also the elements consistent withthe presence of a gap in the excitation spectrum.Comment: version accepted for publication in Phys.Rev.B-Rapid Communicatio

physical review. b, condensed matter and materials physics

Ground-state order and spin-lattice coupling in tetrahedral spin systems<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">Cu</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub></mml:mrow><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">Te</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub></mml:mrow><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">O</mml:mi…

Ground-state order and spin-lattice coupling in tetrahedral spin systemsCu2Te2O