serval:BIB_F6CC1D97AC5B
Ground-state order and spin-lattice coupling in tetrahedral spin systems Cu2Te2O5X2 (X = Br or Cl)
10.1103/PhysRevB.69.180401
Prester
M.
author
Smontara
A.
author
Zivkovic
I.
author
Bilusic
A.
author
Drobac
D.
author
Berger
H.
author
Bussy
F.
author
article
2004
Physical Review B
1098-0121
journal
69
180401
High-resolution ac susceptibility and thermal conductivity measurement
on Cu2Te2O5X2 (X=Br,Cl) single crystals are reported. For Br-sample,
sample dependence prevents one from distinguishing 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.
eng
60_published
true
peer-reviewed
University of Lausanne
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