Field Induced Staggered Magnetization and Magnetic Ordering in $Cu_2 (C_5 H_{12} N_2)_2 Cl_4$

Details Field Induced Staggered Magnetization and Magnetic Ordering in $Cu_2 (C_5 H_{12} N_2)_2 Cl_4$ Field Induced Staggered Magnetization and Magnetic Ordering in $Cu_2 (C_5 H_{12} N_2)_2 Cl_4$

2006-09-20

arxiv.org/abs/cond-mat/0609496v1

Physical Review Letters 97, 20 OCTOBER 2006 (2006) 167204

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages

Scientific paper

10.1103/PhysRevLett.97.167204

We present a $^2$D NMR investigation of the gapped spin-1/2 compound $Cu_2 (C_5 H_{12} N_2)_2 Cl_4$. Our measurements reveal the presence of a magnetic field induced transverse staggered magnetization (TSM) which persists well below and above the field-induced 3D long-range magnetically ordered (FIMO) phase. The symmetry of this TSM is different from that of the TSM induced by the order parameter of the FIMO phase. Its origin, field dependence and symmetry can be explained by an intra-dimer Dzyaloshinskii-Moriya interaction, as shown by DMRG calculations on a spin-1/2 ladder. This leads us to predict that the transition into the FIMO phase is not in the BEC universality class.

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