Volume 73, Number 1, January 2006
|Page(s)||83 - 89|
|Section||Condensed matter: electronic structure, electrical, magnetic, and optical properties|
|Published online||02 December 2005|
Helical ground state and weak ferromagnetism in the edge-shared chain cuprate
IFW Dresden - P.O. Box 270116, D-01171 Dresden, Germany
2 Institut für Theoretische Physik, O.-v.-Guericke-Universität Magdeburg - Germany
3 Moscow State University - Russia
4 Moscow Institute of Radiotechnics, Electronics and Automation - Russia
5 Ural State University - Ekaterinburg, Russia
6 Institute of Physics ASCR - Prague, Czech Republic
7 Max-Planck-Institut für Chemische Physik fester Stoffe - Dresden, Germany
Corresponding author: firstname.lastname@example.org
Accepted: 26 October 2005
We report on susceptibility, magnetization, NMR, and specific heat data of the spin-chain material in the paramagnetic and ordered phases. Below 13 K, where a sharp field-dependent specific heat peak appears, the NMR lineshape points to an incommensurate static modulation of the local magnetic field consistent with a spiral state of the Cu magnetic moments. At 2 K weak ferromagnetism with an ordered moment of about 4 has been observed. LDA-based estimates of exchange integrals reveal a large inchain frustration leading to a magnetic spiral.
PACS: 74.72.Jt – Other cuprates, including Tl and Hg-based cuprates / 76.60.-k – Nuclear magnetic resonance and relaxation / 75.10.Pq – Spin chain models
© EDP Sciences, 2005
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