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NMR study of the high-field magnetic phase of LiCuVO$_4$ | | N. Buttgen
; W. Kraetschmer
; L.E. Svistov
; L.A. Prozorova
; A. Prokofiev
; | | Date: |
22 Dec 2009 | | Abstract: | We report on NMR studies of the quasi--1D antiferromagnetic $S=1/2$ chain
cuprate LiCuVO$_4$, focusing on the high--field spin--modulated phase observed
recently in applied magnetic fields $H > H_{
m c2}$ ($mu_0H_{
m c2} approx
7.5$ T). The NMR spectra of $^7$Li and $^{51}$V around the transition from the
ordered to the paramagnetic state were measured. It is shown that the
spin--modulated magnetic structure forms with ferromagnetic interactions
between spins of neighboring chains within the {f ab}--plane at low
temperatures 0.6 K $ < T < T_{
m N}$. The best fit provides evidence that the
mutual orientation between spins of neighboring {f ab}--planes is random. For
elevated temperatures $T_{
m N} < T lesssim 15$ K, short--range magnetic
order occurs at least on the characteristic time scale of the NMR experiment. | | Source: | arXiv, 0912.4376 | | Services: | Forum | Review | PDF | Favorites | |
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