51V-NMR Study of the Quasi-one-dimensional Antiferromagnet BaCo2V2O8

다국어 초록 (Multilingual Abstract)

We have investigated the magnetic properties of quasi-one-dimensional antiferromagnetBaCo2V2O8 by the measurements of 51V-NMR spectrum. With decreasing temperature, Kk showsa broad peak around 30 K signaling the 1D short-range order in the Co2+ spin chain. The estimatedWeiss temperature Θ = −105 K, hyperfine coupling constants Akhf = 2.1 kOe/µB for H k c and Ahf= 2.6 kOe/µB for H ⊥ c at 13 kOe are comparable to those at 70.6 kOe. These results suggest thatstatic magnetic properties in the paramagnetic state are nearly independent of external magneticfield, although the ground N´eel state is suppressed by the application of external magnetic fieldabove Hc = 39 kOe along c-axis. In the antiferromagnetic state below TN = 5.4 K, the doublerectangle-like powder pattern was observed, indicating two V sites exposed to different size of internalfields, HA1 = 2.1 and HA2 = 3.8 kOe. The internal fields at V sites are explained by takinginto account of the classical and pseudo-dipolar fields from Co2+ magnetic moments.

참고문헌 (Reference)

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