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Dresden 2014 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 20: Correlated Electrons: Spin Systems and Itinerant Magnets - Frustrated Magnets II

TT 20.5: Vortrag

Montag, 31. März 2014, 16:00–16:15, HSZ 304

NMR on the Frustrated Spin-chain Compound PbCuSO4(OH)2 - Linarite — •M. Schäpers1, A. U. B. Wolter1, B. Willenberg2,4, S.-L. Drechsler1, H. Rosner3, S. Süllow4, and B. Büchner11Leibniz-Institut IFW Dresden, Dresden, Germany — 2HZB, Berlin, Germany — 3MPI CPfS, Dresden, Germany — 4IPKM, TU Braunschweig, Braunschweig, Germany

We present an extensive microscopic magnetic study of the quasi-one-dimensional frustrated s = 12 spin-chain compound linarite. Angular dependent susceptibility and 1H-NMR measurements were performed at various temperatures in the paramagnetic state. All relevant NMR parameters, viz., the chemical, dipolar, and Fermi-contact contribution, were extracted to analytically calculate the local magnetic fields at the 1H sites. From this analysis, a significant total spin transfer of ∼10.5 % from the magnetic copper ions onto the two oxygen ligands was derived. The magnetically ordered spin-spiral ground state below TN = 2.8 K was investigated by 1H-NMR for fields µ0 H = 2.0 T along the three crystallographic main directions. With the derived NMR parameters in the paramagnetic regime it is possible to model the NMR spectrum for Hc, which is in agreement with previous neutron studies [1]. Furthermore, we compare our results with density functional band structure calculations and subsequent cluster calculations applying a pd model.

This work has partially been supported by the DFG under Contracts No. WO 1532/3-1 and No. SU229/10-1.
[1] B. Willenberg et al., Phys. Rev. Lett. 108, 117202 (2012).

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