Staging model of the ordered stacking of vacancy layers and phase separation in layered Na_xCoO₂ (x0.71) single crystals

Abstract

References (16)

Citing Articles

Download: PDF (444 kB) or Buy this Article (US$25) (Use Article Pack)

G. J. Shu,¹ F.-T. Huang,^1,2,3 M.-W. Chu,¹ J.-Y. Lin,⁴ Patrick A. Lee,⁵ and F. C. Chou^1,6
¹Center for Condensed Matter Sciences, National Taiwan University, Taipei 10617, Taiwan
²Taiwan International Graduate Program, Academia Sinica, Taipei 10115, Taiwan
³Department of Chemistry, National Taiwan University, Taipei 10617, Taiwan
⁴Department of Physics, National Jiao-Tong University, Hsinchu 30076, Taiwan
⁵Department of Physics, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA
⁶National Synchrotron Radiation Research Center, Hsinchu 30076, Taiwan

Received 30 June 2009; published 28 July 2009

Phasediagram of Na_xCoO₂(x0.71) has been reinvestigated using electrochemically fine-tuned singlecrystals. Both phase-separation and staging phenomena as a result ofsodium multivacancy cluster ordering have been found. Phase-separation phenomenon isobserved in the narrow ranges of 0.76x0.82 and 0.83x0.86. Whilex=0.820 shows A-type antiferromagnetic (A-AF) ordering below 22 K, x=0.833is confirmed to have a magnetic ground state of A-AFordering below ~8 K and is only reachable through slow cooling.In addition, x=0.859 is found to be responsible for thehighest A-AF transition temperature at about 29 K. Staging modelbased on ordered stacking of multivacancy layers is proposed toexplain the hysteretic behavior and A-AF correlation length for x~0.82–0.86.

URL:	http://link.aps.org/doi/10.1103/PhysRevB.80.014117
DOI:	10.1103/PhysRevB.80.014117
PACS:	74.62.Bf; 74.25.Bt; 74.62.Dh; 74.78.Fk 74.62.Bf Effects of material synthesis, crystal structure, and chemical composition on superconducting transition temperature 74.25.Bt Thermodynamic properties of superconductors 74.62.Dh Effects of crystal defects, doping and substitution on superconducting transition temperature 74.78.Fk Superconducting multilayers, superlattices, heterostructures YEAR: 2009
KEYWORDS:	antiferromagnetic materials, ground states, magnetic hysteresis, magnetic thin films, magnetic transition temperature, phase diagrams, phase separation, sodium compounds, vacancies (crystal)

REFERENCES (16)

View in Separate Window/Tab

For access to fully linked references, you need to log in. For access to fully linked references, you need to Log in.

M. L. Foo, Y. Wang, S. Watauchi, H. W. Zandbergen, T. He, R. J. Cava, and N. P. Ong, Phys. Rev. Lett. 92, 247001 (2004).
P. Mendels et al., Phys. Rev. Lett. 94, 136403 (2005).
S. P. Bayrakci, I. Mirebeau, P. Bourges, Y. Sidis, M. Enderle, J. Mesot, D. P. Chen, C. T. Lin, and B. Keimer, Phys. Rev. Lett. 94, 157205 (2005).
G. J. Shu, A. Prodi, S. Y. Chu, Y. S. Lee, H. S. Sheu, and F. C. Chou, Phys. Rev. B 76, 184115 (2007).
F. C. Chou, M. W. Chu, G. J. Shu, F. T. Huang, W. W. Pai, H. S. Sheu, and P. A. Lee, Phys. Rev. Lett. 101, 127404 (2008).
L. Balicas, Y. J. Jo, G. J. Shu, F. C. Chou, and P. A. Lee, Phys. Rev. Lett. 100, 126405 (2008).
T. F. Schulze, P. S. Hafliger, C. Niedermayer, K. Mattenberger, S. Bubenhofer, and B. Batlogg, Phys. Rev. Lett. 100, 026407 (2008).
G. J. Shu and F. C. Chou, Phys. Rev. B 78, 052101 (2008).
F.-T. Huang, M.-W. Chu, G. J. Shu, H. S. Sheu, C. H. Chen, L.-K. Liu, P. A. Lee, and F. C. Chou, Phys. Rev. B 79, 014413 (2009).
J. Sugiyama, J. H. Brewer, E. J. Ansaldo, H. Itahara, T. Tani, M. Mikami, Y. Mori, T. Sasaki, S. Hebert, and A. Maignan, Phys. Rev. Lett. 92, 017602 (2004).
J. L. Luo, N. L. Wang, G. T. Liu, D. Wu, X. N. Jing, F. Hu, and T. Xiang, Phys. Rev. Lett. 93, 187203 (2004).