Regensburg 2019 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 18: Frustrated Magnets - General 2 (joint session TT/MA)
MA 18.6: Vortrag
Dienstag, 2. April 2019, 15:15–15:30, Theater
Asymptotical high-field saturation in spin-1/2 systems with XYZ spin-anisotropy and/or Dzyaloshinskii Moriya interactions — •Stefan-Ludwig Drechsler1, Rolf Schumann2, Richter Johannes3, Ullrich Roessler1, Roman Kuzian4, Helge Rosner5, Alexander Tsirlin6, and Satoshi Nishimoto1,2 — 1ITF at the IFW-Dresden, Dresden, Germany — 2TU Dresden, Theoret. Phys., Germany — 3Universität Magdeburg, Inst. Theo. Phys. — 4Inst. f. Material Sciences, Kyiv, Ukraine — 5MPI-CPfS. Dresden, Germany — 6Exp. Physik, Augsburg, Germany
We consider the high-field saturation of longitudinal and transversal magnetizations M(B) of a wide class of spin-1/2 systems with low lattice symmetry leading to XYZ spin anisotropy and/or the presence of Dzyaloishnskii-Moriya (DM) interaction between nearest neighbor (NN) spins. Exact analytical, exact doagonalization and DMRG results are presented for small and large clusters as well as extended 1D and 2D systems. Above the last inflection point of the longitudinal magnetization only a power-law universal magnetization ∝ 1/B2 in leading order is found. We provide also higher order terms and focus on the influence of boundary conditions and the cases of staggered magnetizations and transversal DM components. Applications to various spin-chain compounds such as linarite and qubit/qutrit quantum dots being of interest in the field of quantum computing are discussed and compared critically with results published so far. Fitting experimental data within improper spin-symmetries, such as XXZ, may lead to unphysical large DM terms overestimated by an order of magnitude.