Helical ground state and weak ferromagnetism in the edge-shared chain cuprate NaCu2O2

被引：63
作者：
Drechsler, SL
Richter, J
Gippius, AA
Vasiliev, A
Bush, AA
Moskvin, AS
Málek, J
Prots, Y
Schnelle, W
Rosner, H
机构：
[1] IFW Dresden, D-01171 Dresden, Germany
[2] Otto Von Guericke Univ, Inst Theoret Phys, Magdeburg, Germany
[3] Moscow MV Lomonosov State Univ, Moscow, Russia
[4] Moscow Inst Radiotech Elect & Automat, Moscow, Russia
[5] Ural State Univ, Ekaterinburg, Russia
[6] ASCR, Inst Phys, Prague, Czech Republic
[7] Max Planck Inst Chem Phys Stoffe, Dresden, Germany
来源：
EUROPHYSICS LETTERS | 2006年 / 73卷 / 01期
关键词：
D O I：
10.1209/epl/i2005-10356-y
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
We report on susceptibility, magnetization, Na-23 NMR, and specific heat data of the spin-chain material NaCu2O2 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 4.10(-3) mu B has been observed. LDA-based estimates of exchange integrals reveal a large inchain frustration leading to a magnetic spiral.
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页码：83 / 89
页数：7
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