Abstract
Na x CoO2 (x>0.7) single crystals with a typical dimension of 0.4×0.4 mm2 have been prepared by a “rapid heat-up” technique. By the Benchtop Small Molecule X-ray Crystallography System, the samples have been confirmed to be a single phase of the hexagonal γ-Na x CoO2. Magnetic data from the crystal indicate a magnetic phase transition around T=30 K, and the transition is sensitive to the applied magnetic fields. This is most consistent with the formation of an antiferromagnetic spin-density-wave (SDW) with the easy axis for magnetization nearly along the c-axis. Weak and soft ferromagnetism has also been observed from the crystal at low temperature. This unconventional magnetic property may be ascribed to the effect of the small moments of Co4−x−δ sites at low temperature.
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Abbreviations
- SDW:
-
Spin-density-wave;
- VSM:
-
Vibrating sample magnetometer
References
Terasaki, I., Sasago, Y., Uchinokura, K.: Phys. Rev. B 56, R12685 (1997)
Takada, K., Sakurai, H., Takayama-Muromachi, E., Izumi, F., Dilanian, R.A., Sasaki, T.: Nature 422, 53 (2003)
Wang, Y.Y., Rogado, N.S., Cava, R.J., Ong, N.P.: Nature 423, 425 (2003)
Maeno, Y., Hashimoto, H., Yoshida, K., Nishizaki, S., Fujita, T., Bednorz, J.G., Lichtenberg, F.: Nature 372, 532 (1994)
Lynn, J.W., Huang, Q., Brown, C.M., Miller, V.L., Foo, M.L., Schaak, R.E., Jones, C.Y., Mackey, E.A., Cava, R.J.: Phys. Rev. B 68, 214516 (2003)
Jorgensen, J.D., Avdeev, M., Hinks, D.G., Burley, J.C., Short, S.: Phys. Rev. B 68, 214517 (2003)
Foo, M.L., Wang, Y., Watauchi, S., Zandbergen, H.W., He, T., Cava, R.J., Ong, N.P.: Phys. Rev. Lett. 92, 247001 (2004)
Motohashi, T., Ueda, R., Naujalis, E., Tojo, T., Terasaki, I., Atake, T., Karppinen, M., Yamauchi, H.: Phys. Rev. B 67, 064406 (2003)
Wang, C.H., Chen, X.H., Wu, T., Luo, X.G., Wang, G.Y., Luo, J.L.: Phys. Rev. Lett. 96, 216401 (2006)
Gasparovic, G., Ott, R.A., Cho, J.H., Chou, F.C., Chu, Y., Lynn, J.W., Lee, Y.S.: Phys. Rev. Lett. 96, 046403 (2006)
Sales, B.C., Jin, R., Affholter, K.A., Khalifah, P., Veith, G.M., Mandrus, D.: Phys. Rev. B 70, 174419 (2004)
Motohashi, T., Naujalis, E., Ueda, R., Isawa, K., Karppinen, M., Yamauchi, H.: Appl. Phys. Lett. 79, 1480 (2001)
Chen, X.M., Cai, J.W.: Principle and Practice of Single-Crystal Structural Analysis. Science Press, Beijing (2004)
Zhou, G.D., Guo, K.X.: The Diffraction of Crystal and Quasicrystal. Perking University Press, Beijing (1999)
Bayrakci, S., Bernhard, C., Chen, D.P., Keimer, B., Kremer, R.K., Lemmens, P., Lin, C.T., Niedermayer, C., Strempfer, J.: Phys. Rev. B 69, 100410(R) (2004)
Luo, J.L., Wang, N.L., Liu, G.T., Wu, D., Jing, X.N., Hu, F., Xiang, T.: Phys. Rev. Lett. 93, 187203 (2004)
Chen, H., Wu, T., Xie, Y.L., Liu, R.H., Wu, G., Wang, X.F., Chen, X.H.: J. Phys. Condens. Matter 21, 016004 (2009)
Yokoi, M., Moyoshi, T., Kobayashi, Y., Soda, M., Yasui, Y., Sato, M., Kakurai, K.: J. Phys. Soc. Jpn. 74, 3046 (2005)
Zhang, G.M., Su, Y.H., Lu, Z.Y., Weng, Z.Y., Lee, D.H., Xiang, T.:. arXiv:0809.3874v2
Acknowledgements
This work is supported by the Fundamental Research Funds for the Central Universities, Foundation for Climax Talents Plan in Six-Big Fields of Jiangsu Province of China (Grant No. 1107020070), and Large Equipment Grants of Southeast University, China.
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Li, Q., Zhang, Y. & Xu, M. Unconventional Magnetic Transition in Na x CoO2 (x>0.7) Single Crystals. J Supercond Nov Magn 27, 1235–1238 (2014). https://doi.org/10.1007/s10948-013-2406-y
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DOI: https://doi.org/10.1007/s10948-013-2406-y