Anisotropic magnetization and sign change of dynamic susceptibility in Na0.85CoO2 single crystal

Details Anisotropic magnetization and sign change of dynamic susceptibility in Na0.85CoO2 single crystal Anisotropic magnetization and sign change of dynamic susceptibility in Na0.85CoO2 single crystal

2008-04-29

arxiv.org/abs/0804.4532v1

Physics

Condensed Matter

Materials Science

will be published in the Physical Review B

Scientific paper

The DC and AC magnetic susceptibilities of Na0.85CoO2 single crystals were measured for the different crystal orientations of H//(ab)- and H//(c)-axis. The DC-magnetic susceptibility for H//(c)-direction exhibited the antiferromagnetic transition at TN= 22 K. The thermal hysteresis between the zero-field-cooled (ZFC) and the field-cooled (FC) magnetization below TN and the large frustration parameter indicated the spin frustration along the (c)-axis. For an applied magnetic field in H//(ab)-plane, the DC magnetic susceptibility exhibited the logarithmic divergent behavior at low temperatures (T < 6.8 K). This could be understood by the impurity spin effect, dressed by the spin fluctuation. From the AC magnetic susceptibility measurements, the real part of the AC-susceptibility for H//(ab) exhibited the spin glass-like behavior at low temperatures (T < 4 K). Remarkably, for an applied AC magnetic field with H//(c)-axis, the sign of the AC magnetic susceptibility changed from a positive to a negative value with increasing AC magnetic field frequency (f > 3 kHz) at low temperatures (T > 7 K). We interpret the sign change of AC magnetic susceptibility along the (c)-axis in terms of the sudden sign reversal of the phase difference from in-phase to out-of-phase response with an applied AC magnetic field in the AC-susceptibility phase space.

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