Unconventional charge ordering in Na0.70CoO2 below 300 K -: art. no. 100404

被引：70

作者：

Gavilano, JL ^{[1
]}

Rau, D ^{[1
]}

Pedrini, B ^{[1
]}

Hinderer, J ^{[1
]}

Ott, HR ^{[1
]}

Kazakov, SM ^{[1
]}

Karpinski, J ^{[1
]}

机构：

[1] ETH Honggerberg, Festkorperphys Lab, CH-8093 Zurich, Switzerland

来源：

PHYSICAL REVIEW B | 2004年 / 69卷 / 10期

关键词：

D O I：

10.1103/PhysRevB.69.100404

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We present the results of measurements of the dc-magnetic susceptibility chi(T) and the Na-23-NMR response of Na0.70CoO2 at temperatures between 50 and 340 K. The chi(T) data suggest that for T>75 K, the Co ions adopt an effective configuration of Co3.4+. The Na-23-NMR response reveals pronounced anomalies near 250 and 295 K, but no evidence for magnetic phase transitions is found in chi(T). Our data suggest the onset of a dramatic change in the Co 3d-electron spin dynamics at 295 K. This process is completed at 230 K. Our results may be interpreted as evidence for either a tendency to electron localization or an unconventional charge-density-wave phenomenon within the Co 3d electron system near room temperature.

引用

页数：4

共 50 条

[21] Three-dimensional spin fluctuations in Na0.75CoO2 -: art. no. 157206
Helme, LM
Boothroyd, AT
Coldea, R
Prabhakaran, D
Tennant, DA
Hiess, A
Kulda, J
PHYSICAL REVIEW LETTERS, 2005, 94 (15)
[22] Doping effect on the charge ordering in AlV2O4 -: art. no. 052411
Horibe, Y
Kurushima, K
Mori, S
Asada, T
Koyama, Y
Shingu, M
Katsufuji, T
PHYSICAL REVIEW B, 2005, 71 (05):
[23] Charge ordering and spin frustration in AlV2-xCrxO4 -: art. no. 096404
Matsuno, K
Katsufuji, T
Mori, S
Nohara, M
Machida, A
Moritomo, Y
Kato, K
Nishibori, E
Takata, M
Sakata, M
Kitazawa, K
Takagi, H
PHYSICAL REVIEW LETTERS, 2003, 90 (09)
[24] Pressure-induced superconductivity in β-Na0.33V2O5 beyond charge ordering -: art. no. 057002
Yamauchi, T
Ueda, Y
Môri, N
PHYSICAL REVIEW LETTERS, 2002, 89 (05)
[25] Unconventional superconductivity and electron correlations in the cobalt oxyhydrate Na0.35CoO2•yH2O from nuclear quadrupole resonance -: art. no. 047004
Fujimoto, T
Zheng, GQ
Kitaoka, Y
Meng, RL
Cmaidalka, J
Chu, CW
PHYSICAL REVIEW LETTERS, 2004, 92 (04) : 4
[26] Charge ordering and charge dynamics in Nd2-xSrxNiO4 (0.33≤x≤0.7) -: art. no. 184418
Ishizaka, K
Taguchi, Y
Kajimoto, R
Yoshizawa, H
Tokura, Y
PHYSICAL REVIEW B, 2003, 67 (18)
[27] Magnetic, thermodynamic, and transport characterization of Na0.75CoO2 single crystals -: art. no. 174419
Sales, BC
Jin, R
Affholter, KA
Khalifah, P
Veith, GM
Mandrus, D
PHYSICAL REVIEW B, 2004, 70 (17): : 1 - 9
[28] Effect of dynamical Coulomb correlations on the Fermi surface of Na0.3CoO2 -: art. no. 196401
Ishida, H
Johannes, MD
Liebsch, A
PHYSICAL REVIEW LETTERS, 2005, 94 (19)
[29] ARPES on Na0.6CoO2:: Fermi surface and unusual band dispersion -: art. no. 246403
Yang, HB
Wang, SC
Sekharan, AKP
Matsui, H
Souma, S
Sato, T
Takahashi, T
Takeuchi, T
Campuzano, JC
Jin, R
Sales, BC
Mandrus, D
Wang, Z
Ding, H
PHYSICAL REVIEW LETTERS, 2004, 92 (24) : 246403 - 1
[30] Neutron scattering study of novel magnetic order in Na0.5CoO2 -: art. no. 046403
Gasparovic, G
Ott, RA
Cho, JH
Chou, FC
Chu, Y
Lynn, JW
Lee, YS
PHYSICAL REVIEW LETTERS, 2006, 96 (04)

← 1 2 3 4 5 →