NMR studies of incommensurate quantum antiferromagnetic state of LiCuVO4

Smith, R.; Reyes, A. P.; Ashey, R.; Caldwell, T.; Prokofiev, A.; Aßmus, W.; Teǐtel'Baum, G. B.

doi:10.1016/j.physb.2006.01.409

Cited by 7 publications

(7 citation statements)

References 5 publications

(5 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The spin-echo spectra exhibit a single line for small applied magnetic fields H < H c2 and a double-horn shaped pattern for higher fields. spectra obtained at fields less than µ 0 H < 12 T are in a good agreement with previous results 14,15. The line shape of the NMR spectra do not change between 10 < µ 0 H < 30 T which indicates that the spin-modulated magnetic structure established in Refs.…”

supporting

confidence: 91%

See 1 more Smart Citation

High-field NMR of the quasi-one-dimensional antiferromagnet LiCuVO4

et al. 2012

Self Cite

View full text Add to dashboard Cite

We report on NMR studies of the quasi one-dimensional (1D) antiferromagnetic S = 1/2 chain cuprate LiCuVO4 in magnetic fields H up to µ0H = 30 T (≈ 70 % of the saturation field Hsat). NMR spectra in fields higher than Hc2 (µ0Hc2 ≈ 7.5 T) and temperatures T < TN can be described within the model of a spin-modulated phase in which the magnetic moments are aligned parallel to the applied field H and their values alternate sinusoidally along the magnetic chains. Based on theoretical concepts about magnetically frustrated 1D chains, the field dependence of the modulation strength of the magnetic structure is deduced from our experiments. Relaxation time T2 measurements of the 51 V nuclei show that T2 depends on the particular position of the probing 51 V nucleus with respect to the magnetic copper moments within the 1D chains: the largest T2 value is observed for the vanadium nuclei which are very next to the magnetic Cu 2+ ion with largest ordered magnetic moment. This observation is in agreement with the expectation for the spin-modulated magnetic structure. The (H, T ) magnetic phase diagram of LiCuVO4 is discussed.

show abstract

supporting

confidence: 91%

“…spectra obtained at fields less than µ 0 H < 12 T are in a good agreement with previous results. 14,15 The line shape of the NMR spectra do not change between 10 < µ 0 H < 30 T which indicates that the spin-modulated magnetic structure established in Refs. 12,14 is robust within this extended field…”

Section: Resultsmentioning

confidence: 70%

High-field NMR of the quasi-one-dimensional antiferromagnet LiCuVO4

et al. 2012

Self Cite

View full text Add to dashboard Cite

show abstract

“…For this system, the exchange interaction between the nearest neighbor Cu 2+ ions through the Cu-O-Cu exchange paths is rather weak, as expected for the Cu-O-Cu angle close to 90° (~95°), or even weaker than the next nearest neighbor interaction, [2][3][4] suggesting effects of the magnetic frustration are significant in its magnetic properties. Actually, the reported magnetic structure is not trivial: [2][3][4] As also shown in Fig. 1, it has the helical structure with the incommensurate modulation vector Q~0.532b * with the spins in the CuO 4 square planes.…”

mentioning

confidence: 68%

“…Moreover, the system may become, if it has the simultaneous transition, the rare example of the multiferroics with the spins only in the x 2 -y 2 orbital, even though many systems with magnetic moments in the t 2g orbitals have been reported to be multiferroic. [7][8][9][10][11] In the present work, we have carried out measurements of the magnetic-and dielectric-susceptibilities on both polycrystalline and single crystal samples of LiCuVO 4 , and found that the system really exhibits the anomalous temperature (T) dependences of these quantities for the applied electric field parallel to a, indicating that the magnetic and ferroelectric simultaneous transitions take place at the critical temperature T c~2 .4 K. The electric polarization is expected to appear only along the a axis, which is consistent with the theoretical considerations. 5,6) The magnetic field dependence of T c have also been studied.…”

mentioning

confidence: 99%

Ferroelectric Transition Induced by the Incommensurate Magnetic Ordering in LiCuVO₄

et al. 2007

View full text Add to dashboard Cite

A ferroelectric transition occurring simultaneously with helical spin order has been found in both the polycrystalline and single crystal samples of LiCuVO 4 . The system has Cu 2+ spins (s=1/2) of the CuO 2 chains formed of edge-sharing CuO 4 squares. Possibly due to the frustrated nature caused by the competition between the nearest-neighbor and next-nearest-neighbor exchange interactions, Cu spins exhibit, as has been already reported, the helical magnetic order with the incommensurate modulation vector Q along the chain direction and with the helical axis e 3 perpendicular to the CuO 4 squares. The electric polarization P can be understood by the recently predicted relation P ∝ Q×e 3 . The transition temperature has been found to be gradually suppressed by the applied magnetic field.

show abstract

“…2. ͑Color online͒ NMR spectra of 51 V measured at T = 0.6 K for different frequencies, i.e., different applied magnetic fields H. The spectrum obtained in Ref 13. at T = 1.64 K is included.…”

mentioning

confidence: 99%

NMR study of the high-field magnetic phase ofLiCuVO4

et al. 2010

Self Cite

View full text Add to dashboard Cite

We report on NMR studies of the quasi-one-dimensional antiferromagnetic S =1/ 2 chain cuprate LiCuVO 4 , focusing on the high-field spin-modulated phase observed recently in applied magnetic fields H Ͼ H c2 ͑ 0 H c2 Ϸ 7.5 T͒. 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 ab plane at low temperatures 0.6 K Ͻ T Ͻ T N . The best fit provides evidence that the mutual orientation between spins of neighboring ab planes is random. For higher temperatures T N Ͻ T Շ 15 K, short-range magnetic order occurs at least on the characteristic time scale of the NMR experiment.

show abstract

NMR studies of incommensurate quantum antiferromagnetic state of LiCuVO4

Cited by 7 publications

References 5 publications

High-field NMR of the quasi-one-dimensional antiferromagnet LiCuVO4

High-field NMR of the quasi-one-dimensional antiferromagnet LiCuVO4

Ferroelectric Transition Induced by the Incommensurate Magnetic Ordering in LiCuVO₄

NMR study of the high-field magnetic phase ofLiCuVO4

Contact Info

Product

Resources

About

NMR studies of incommensurate quantum antiferromagnetic state of LiCuVO4

Cited by 7 publications

References 5 publications

High-field NMR of the quasi-one-dimensional antiferromagnet LiCuVO4

High-field NMR of the quasi-one-dimensional antiferromagnet LiCuVO4

Ferroelectric Transition Induced by the Incommensurate Magnetic Ordering in LiCuVO4

NMR study of the high-field magnetic phase ofLiCuVO4

Contact Info

Product

Resources

About

Ferroelectric Transition Induced by the Incommensurate Magnetic Ordering in LiCuVO₄