| Autor: |
Grafe, H. -J., Nishimoto, S., Iakovleva, M., Vavilova, E., Spillecke, L., Alfonsov, A., Sturza, M. -I., Wurmehl, S., Nojiri, H., Rosner, H., Richter, J., Rößler, U. K., Drechsler, S. -L., Kataev, V., Büchner, B. |
| Rok vydání: |
2016 |
| Předmět: |
|
| Zdroj: |
revised version published in Sci. Rep. 7, 6729 (2017) |
| Druh dokumentu: |
Working Paper |
| DOI: |
10.1038/s41598-017-06525-0 |
| Popis: |
Modern theories of quantum magnetism predict exotic multipolar states in weakly interacting strongly frustrated spin-1/2 Heisenberg chains with ferromagnetic nearest neighbor (NN) inchain exchange in high magnetic fields. Experimentally these states remained elusive so far. Here we report the evidence for a long-sought magnetic field-induced nematic state arising above a field of $\sim 13$ T in the edge-sharing chain cuprate LiSbCuO$_4$ $\equiv$ LiCuSbO$_4$. This interpretation is based on the observation of a field induced spin-gap in the measurements of the $^7$Li NMR spin relaxation rate $T_1^{-1}$ as well as a contrasting field-dependent power-law behavior of $T_1^{-1}$ vs. $T$ and is further supported by static magnetization and ESR data. An underlying theoretical microscopic approach favoring a nematic scenario is based essentially on the NN XYZ exchange anisotropy within a model for frustrated spin-1/2 chains. It is investigated by the DMRG technique. The employed exchange parameters are justified qualitatively by electronic structure calculations for LiCuSbO$_4$. |
| Databáze: |
arXiv |
| Externí odkaz: |
|
