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

被引：64

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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