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09 May 2024 |
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Electronic structure, magnetic and dielectric properties of the edge-sharing copper-oxide chain compound NaCu$_{2}$O$_{2}$ | | Ph. Leininger
; M. Rahlenbeck
; M. Raichle
; B. Bohnenbuck
; E. Weschke
; E. Schierle
; A. Maljuk
; C. T. Lin
; S. Seki
; Y. Tokura
; J. W. Freeland
; B. Keimer
; | | Date: |
1 Dec 2009 | | Abstract: | We report an experimental study of
co, a Mott insulator containing chains
of edge-sharing CuO$_4$ plaquettes, by polarized x-ray absorption spectroscopy
(XAS), resonant magnetic x-ray scattering (RMXS), magnetic susceptibility, and
pyroelectric current measurements. The XAS data show that the valence holes
reside exclusively on the Cu$^{2+}$ sites within the copper-oxide spin chains
and populate a $d$-orbital polarized within the CuO$_4$ plaquettes. The RMXS
measurements confirm the presence of incommensurate magnetic order below a
N’eel temperature of $T_N = 11.5$ K, which was previously inferred from
neutron powder diffraction and nuclear magnetic resonance data. In conjunction
with the magnetic susceptibility and XAS data, they also demonstrate a new
"orbital" selection rule for RMXS that is of general relevance for magnetic
structure determinations by this technique. Dielectric property measurements
reveal the absence of significant ferroelectric polarization below $T_N$, which
is in striking contrast to corresponding observations on the isostructural
compound lco. The results are discussed in the context of current theories of
multiferroicity. | | Source: | arXiv, 0912.0168 | | Services: | Forum | Review | PDF | Favorites | |
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