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Search for a spin-nematic phase in the quasi-one-dimensional frustrated magnet LiCuVO$_4$ | | N. Büttgen
; K. Nawa
; T. Fujita
; M. Hagiwara
; P. Kuhns
; A. Prokofiev
; A. P. Reyes
; L. E. Svistov
; K. Yoshimura
; M. Takigawa
; | | Date: |
1 Oct 2014 | | Abstract: | We have performed NMR experiments on the quasi one-dimensional frustrated
spin-1/2 system LiCuVO$_4$ in magnetic fields $H$ applied along the c-axis up
to field values near the saturation field $H_{
m sat}$. For the field range
$H_{
m c2}<H<H_{
m c3}$ ($mu_0H_{
m c2}approx 7.5$T and $mu_0H_{
m c3} =
[40.5 pm 0.2]$T) the $^{51}$V NMR spectra at $T$ = 380mK exhibit a
characteristic double-horn pattern, as expected for a spin-modulated phase in
which the magnetic moments of Cu$^{2+}$ ions are aligned parallel to the
applied field $H$ and their magnitudes change sinusoidally along the magnetic
chains. For higher fields, the $^{51}$V NMR spectral shape changes from the
double-horn pattern into a single Lorentzian line. For this Lorentzian line,
the internal field at the $^{51}$V nuclei stays constant for $mu_0 H > 41.4$T,
indicating that the majority of magnetic moments in LiCuVO$_4$ are already
saturated in this field range. This result is inconsistent with the previously
observed linear field dependence of the magnetization $M(H)$ for $H_{
m
c3}<H<H_{
m sat}$ with $mu_0H_{
m sat}=45$T [L. E. Svistov {it et al}.,
JETP Letters {f 93}, 21 (2011)]. We argue that the discrepancy is due to
non-magnetic defects in the samples. The results of the spin-lattice relaxation
rate of $^7$Li nuclei indicate an energy gap which grows with field twice as
fast as the Zeeman energy of a single spin, therefore, suggesting that the
two-magnon bound state is the lowest energy excitation. The energy gap tends to
close at $mu_0H approx 41$T. Our results suggest that the theoretically
predicted spin-nematic phase, if it exists in LiCuVO$_4$, can be established
only within the narrow field range $40.5 < mu_0 H < 41.4$T . | | Source: | arXiv, 1410.0160 | | Services: | Forum | Review | PDF | Favorites | |
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