Field-Controlled Magnetic Order in the Quantum Spin-Ladder System (Hpip)2CuBr4
| Autor: | Thielemann, B., Rüegg, Ch., Kiefer, K., Rønnow, H. M., Normand, B., Bouillot, P., Kollath, C., Orignac, E., Citro, R., Giamarchi, T., Läuchli, A. M., Biner, D., Krämer, K., Wolff-Fabris, F., Zapf, V., Jaime, M., Stahn, J., Christensen, N. B., Grenier, B., McMorrow, D. F., Mesot, J. |
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| Rok vydání: | 2008 |
| Předmět: | |
| Zdroj: | Phys. Rev. B, Rapid Comm., 79, 020408 (2009) |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1103/PhysRevB.79.020408 |
| Popis: | Neutron diffraction is used to investigate the field-induced, antiferromagnetically ordered state in the two-leg spin-ladder material (Hpip)2CuBr4. This "classical" phase, a consequence of weak interladder coupling, is nevertheless highly unconventional: its properties are influenced strongly by the spin Luttinger-liquid state of the ladder subunits. We determine directly the order parameter (transverse magnetization), the ordering temperature, the spin structure, and the critical exponents around the transition. We introduce a minimal, microscopic model for the interladder coupling and calculate the quantum fluctuation corrections to the mean-field interaction. Comment: 4 pages, 4 figures, some changes in presentation |
| Databáze: | arXiv |
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