Metamagnetic Transition in Na$_{0.85}$CoO$_2$ Single Crystals

Details Metamagnetic Transition in Na$_{0.85}$CoO$_2$ Single Crystals Metamagnetic Transition in Na$_{0.85}$CoO$_2$ Single Crystals

2004-04-19

arxiv.org/abs/cond-mat/0404432v2

Phys. Rev. Lett., 93, 187203(2004)

Physics

Condensed Matter

Superconductivity

4 pages, 5 figures

Scientific paper

10.1103/PhysRevLett.93.187203

We report the magnetization, specific heat and transport measurements of high quality Na$_{0.85}$CoO$_2$ single crystals in applied magnetic fields up to 14T. In high temperatures, the system is in a paramagnetic phase. It undergoes a magnetic phase transition below about 20K. When the field is applied along the c-axis, the measurement data of magnetization, specific heat and magnetoresistance reveal a metamagnetic transition from an antiferromagnetic state to a quasi-ferromagnetic state at about 8T in low temperatures. However, no transition is observed in the magnetization measurements up to 14T when the field is applied perpendicular to the c-axis. The low temperature magnetic phase diagram of Na$_{0.85}$CoO$_2$ is determined.

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