Phase diagram of the sodium-rich Na_xCoO_2 cobaltates

A. Zorkovska; A. Baran; M. Kajnakova; A. Feher; J. Sebek; E. Santava; C. T. Lin; J. B. Peng

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Phase diagram of the sodium-rich Na_xCoO_2 cobaltates

机译：富钠的Na_xCoO_2钴的相图

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Specific heat of layered Na_xCoO_2 single crystals (x=0.76– 0.87) down to 100mK and the dc-susceptibility down to 2K in magnetic field applied parallel to the layers has been measured. The specific heat data of single crystals of exceptional high quality with 0.71≤x≤0.747 reported in L. Balicas et al. [Phys. Rev. Lett., 100, 126405 (2008)] with the kind permission of the authors have been also analyzed. Non-Fermi liquid (NFL) features observed in Na concentration dependent temperature region have been analyzed and discussed in terms of disorder induced NFL behavior with quantum Griffiths phases in the background. The phase diagram is proposed, the results indicate possible quantum critical point below x=0.7 and closeness to metal–insulator transition at doping above x=0.87.

机译：在平行于各层施加的磁场中，已测量了层状Na_xCoO_2单晶（x = 0.76-0.87）的比热至100mK，直流磁化率低至2K。 L. Balicas等人报道了0.71≤x≤0.747的高品质单晶的比热数据。 [物理Rev. Lett。，100，126405（2008）]在作者的允许下进行了分析。根据Na浓度依赖性温度区域中观察到的非费米液体（NFL）特征，已经在背景中利用量子格里菲斯相对无序诱导的NFL行为进行了分析和讨论。提出了相图，结果表明在x = 0.7以下可能存在量子临界点，在x = 0.87以上掺杂时接近金属-绝缘体跃迁。

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《Physica status solidi, B. Basic research》 |2010年第3期|共3页
作者
A. Zorkovska; A. Baran; M. Kajnakova; A. Feher; J. Sebek; E. Santava; C. T. Lin; J. B. Peng;
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正文语种 eng
中图分类固体物理学;
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Phase diagram; sodium-rich; dc-susceptibility;

机译：相图富钠直流磁化率;

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1. Phase diagram of the sodium-rich Na_xCoO_2 cobaltates [J] . A. Zorkovska, A. Baran, M. Kajnakova, Physica status solidi, B. Basic research . 2010,第3期

机译：富钠的Na_xCoO_2钴的相图
2. Heat capacity studies of the magnetic phase transition in sodium-rich Na_xCoO_2 (0.73≤x≤0.87) [J] . A. Baran, M. Botko, A. Zorkovska, Low temperature physics: Simultaneous Russian - English publication . 2009,第10期

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Phase diagram of the sodium-rich Na_xCoO_2 cobaltates

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