Dresden 2014 – scientific programme
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TT: Fachverband Tiefe Temperaturen
TT 20: Correlated Electrons: Spin Systems and Itinerant Magnets - Frustrated Magnets II
TT 20.5: Talk
Monday, March 31, 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. Büchner1 — 1Leibniz-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 H∥ c, 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).