Dresden 2017 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 68: Poster 5

MA 68.13: Poster

Freitag, 24. März 2017, 09:30–13:00, P2-OG4

The magnetic phase diagram of the frustrated spin-chain linarite as seen by neutron diffraction — •Leonie Heinze1, Britta Willenberg1,2, Jens-Uwe Hoffmann2, Anja U. B. Wolter-Giraud3, Kirrily C. Rule4, Bachir Ouladdiaf5, and Stefan Süllow11IPKM, TU Braunschweig, Germany — 2HZB, Berlin, Germany — 3IFW Dresden, Dresden, Germany — 4ANSTO, Kirrawee, Australia — 5ILL, Grenoble, France

Linarite, PbCuSO4(OH)2, has been established as a model compound of the frustrated one-dimensional spin-1/2 chain with ferromagnetic nearest-neighbor and antiferromagnetic next-nearest-neighbor interactions [1,2]. Recently, a complex magnetic phase diagram has been reported for linarite in fields B || b axis for temperatures below 2.8 K consisting of five regions [3]. In particular, the so-called phase V has been established as an incommensurate spin density wave (SDW) phase as predicted by theory.

Here, we present an elastic neutron diffraction study on linarite of the magnetic phase diagram B || b, with special emphasis on phase V. This way, the temperature and field dependence of the magnetic moment were established for temperatures down to 50 mK and fields up to 9.5 T. Further, the field and temperature dependence of the incommensurability vector q of the SDW in phase V was established. Finally, the nature of the phase transition IV-V being of first order was derived.

[1] A.U.B. Wolter et al., Phys. Rev. B 85, 014407 (2012).

[2] B. Willenberg et al., Phys. Rev. Lett. 108, 117202 (2012).

[3] B. Willenberg et al., Phys. Rev. Lett. 116, 047202 (2016).

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