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arXiv · 1508.02207

Complex field-induced states in Linarite PbCuSO$_4$(OH)$_2$ with a variety of high-order exotic SDW$_p$ states

B. Willenberg·M. Schäpers·A. U. B. Wolter·S. -L. Drechsler·M. Reehuis·B. Büchner·A. J. Studer·K. C. Rule·B. Ouladdiaf·S. Süllow·S. Nishimoto
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Abstract

Low-temperature neutron diffraction and NMR studies of field-induced phases in linarite are presented for magnetic fields $H \parallel b$ axis. A two-step spin-flop transition is observed as well as a transition transforming a helical magnetic ground state into an unusual magnetic phase with sine-wave modulated moments $\parallel H$. An effective $\tilde{J}_1$-$\tilde{J}_2$ single-chain model with a magnetization-dependent frustration ratio $α_{\rm eff} = -\tilde{J}_2/\tilde{J}_1$ is proposed. The latter is governed by skew interchain couplings and shifted to the vicinity of the ferromagnetic critical point. It explains qualitatively the observation of a rich variety of exotic (for strongly correlated cuprate spin-1/2 Heisenberg systems) longitudinal collinear spin-density wave SDW$_p$ states ($9 \geq p \geq 2$).

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B. Willenberg, M. Schäpers, A. U. B. Wolter, S. -L. Drechsler, M. Reehuis, B. Büchner, A. J. Studer, K. C. Rule, B. Ouladdiaf, S. Süllow, S. Nishimoto. 2015-08-10. Complex field-induced states in Linarite PbCuSO$_4$(OH)$_2$ with a variety of high-order exotic SDW$_p$ states. https://doi.org/10.1103/physrevlett.116.047202

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