Abstract
We present an experimental investigation of the magnetic structure in a tetramer system SeCuO3 using neutron powder-diffraction and nuclear resonance techniques. We establish a commensurate antiferromagnetic ordering with a propagation vector k=(0,0,1). The order parameter follows a critical behavior near TN=8K with a critical exponent β=0.32 in agreement with a three-dimensional universality class. Evidence is presented that a singlet state starts to form on tetramers at temperatures as high as 200 K, and its signature is preserved within the ordered state through a strong renormalization of the ordered magnetic moment on two nonequivalent copper sites mCu1≈0.35μB and mCu2<0.8μB at 1.5 K.
| Original language | English |
|---|---|
| Article number | 054409 |
| Journal | Physical Review B |
| Volume | 98 |
| Issue number | 5 |
| DOIs | |
| State | Published - Aug 9 2018 |
Funding
T.C. and M.S.G. are thankful to M. Horvatić, X. Rocquefelte, and W. Lafargue-dit-Hauret for a thorough discussion of the results. T.C., M.S.G., and M.P. acknowledge the Croatian Science Foundation (HRZZ) for funding the NMR/NQR studies under Grant No. IP-11-2013-2729. Financial support from the Swiss National Science Foundation (SNSF) Project Grants No. 169699 and No. 166298 is gratefully acknowledged. Neutron experiments have been carried out within the framework of the EUROfusion Consortium, and funding has been received from the Euratom Research and Training Programme 2014-2018 under Grant Agreement No. 633053. The views and opinions expressed herein do not necessarily reflect those of the European Commission. Neutron-diffraction experiments have been carried out at SINQ PSI, Villigen, Switzerland.