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19 April 2024 |
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Structural Transitions and Magnetic Structure in NH4CuCl3 via 14N-NMR | | Katsuaki Kodama
; Masashi Takigawa
; Yoshiyuki Shimaoka
; Hidekazu Tanaka
; | | Date: |
19 Dec 2004 | | Subject: | Strongly Correlated Electrons | cond-mat.str-el | | Abstract: | We report results of 14N-NMR experiments on NH4CuCl3 at the magnetic field of 7 T, where the 1/4-magnetization plateau is observed at low temperatures. The quadrupole splitting parameter $
u_{z}$ splits below 70 K, indicating a structural phase transition. At 4.2 K, eight N sites with distinct values of both $
u_{z}$ and the magnetic hyperfine shift $K_{z}$ are resolved in the NMR spectrum for general field directions. We then conlude that the magnetic structure in the 1/4-plateau does not break the symmetry of the crystal. Based on the NMR and the recent neutron scattering results by Ruegg et al. [Phys. Rev. Lett. 93 (2004) 037207], we propose that triplet dimers in the 1/4-plateau is formed not between the nearest neighbor pairs but over different chains. | | Source: | arXiv, cond-mat/0501451 | | Services: | Forum | Review | PDF | Favorites | |
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