Unconventional magnetization plateaus in a Shastry-Sutherland spin tube

Details Unconventional magnetization plateaus in a Shastry-Sutherland spin tube Unconventional magnetization plateaus in a Shastry-Sutherland spin tube

2010-03-08

arxiv.org/abs/1003.1696v3

EPL 94, 67004 (2011)

Physics

Condensed Matter

Other Condensed Matter

Final version as published in EPL

Scientific paper

10.1209/0295-5075/94/67004

Using density matrix renormalization group (DMRG) and perturbative continuous unitary transformations (PCUTs), we study the magnetization process in a magnetic field for all coupling strengths of a quasi-1D version of the 2D Shastry-Sutherland lattice, a frustrated spin tube made of two orthogonal dimer chains. At small inter-dimer coupling, plateaus in the magnetization appear at 1/6, 1/4, 1/3, 3/8, and 1/2. As in 2D, they correspond to a Wigner crystal of triplons. However, close to the boundary of the product singlet phase, plateaus of a new type appear at 1/5 and 3/4. They are stabilized by the localization of {\it bound states} of triplons. Their magnetization profile differs significantly from that of single triplon plateaus and leads to specific NMR signatures. We address the possibility to stabilize such plateaus in further geometries by analyzing small finite clusters using exact diagonalizations and the PCUTs.

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