Comment on 'Superconducting state of Ca-Ⅶ below a critical temperature of 29 K at a pressure of 216 GPa'

M. Andersson

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Comment on 'Superconducting state of Ca-Ⅶ below a critical temperature of 29 K at a pressure of 216 GPa'

机译：关于“Ca-Ⅶ在216 GPa压力下低于29 K临界温度的超导状态”的评论

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In a recent paper, Sakata et al. [Phys. Rev. B 83, 220512(R) (2011) j report on superconductivity at 29 K in Ca under high pressure. Here, I argue that their method to define the onset of the superconducting transition temperature from resistivity measurements is misleading and that the correct value for the onset of the transition based on resistivity data shown in their paper should be 21 K. The discrepancy between these two temperatures is explained by superconducting fluctuations occurring at temperatures above the superconducting transition temperature.

机译：在最近的一篇论文中，Sakata等人。 [物理B 83，220512（R）（2011）j版报道了29 K在高压下在Ca中的超导性。在这里，我认为他们从电阻率测量中定义超导转变温度开始的方法会产生误导，并且根据他们的论文中显示的电阻率数据，转变开始的正确值应为21K。这两者之间的差异温度是通过在高于超导转变温度的温度下发生的超导波动来解释的。

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来源
《Physical review》 |2011年第21期|p.216501.1|共1页
作者
M. Andersson;
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作者单位

Material Physics, Schoolof ICT, KTH Royal Institute of Technology, Electrum 229, SE-164 40 Kista, Sweden;

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正文语种 eng
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关键词
pressure effects; superconducting materials;

机译：压力影响;超导材料;

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1. Superconducting state of Ca-VII below a critical temperature of 29 K at a pressure of 216 GPa [J] . Masafumi Sakata, Yuki Nakamoto, Katsuya Shimizu, Physical review . 2011,第22期

机译：在216 GPa的压力下，低于29 K的临界温度时，Ca-VII的超导状态
2. PRESSURE DEPENDENCE OF THE SUPERCONDUCTING CRITICAL TEMPERATURE OF TL2BA2CA2CU3O10+Y AND TL2BA2CA3CU4O12+Y UP TO 21 GPA [J] . Jover DT., Griessen R., Haines EM., Physical Review, B. Condensed Matter . 1996,第14期

机译：TL2BA2CA2CU3O10 + Y和TL2BA2CA3CU4O12 + Y的最高21 GPA的超导临界温度的压力依赖性
3. PRESSURE DEPENDENCE OF THE SUPERCONDUCTING CRITICAL TEMPERATURE OF HGBA2CA2CU3O8+Y AND HGBA2CA3CU4O10+Y UP TO 30 GPA [J] . Jover DT., Wilhelm H., Griessen R., Physical Review, B. Condensed Matter . 1996,第6期

机译：HGBA2CA2CU3O8 + Y和HGBA2CA3CU4O10 + Y最高30 GPA的超导临界温度的压力依赖性
4. Application of 3D-Josephson Junction Array Model to Critical Temperature of High T_c Oxide Superconducting under Uniaxial Presure and under Hydrostatic Pressure [C] . Chikao Kawabata International cryogenic engineering conference;ICEC;International cryogenic materials conference;ICMC . 1997

机译：3D-Josephson结阵列模型在单轴压力和静水压下高T_c氧化物超导临界温度中的应用
5. Photoemission studies of high critical transition temperature superconductors: Doping dependences, Fermi surfaces, superconducting gaps, and metal-superconductor interfaces. [D] . Dessau, Daniel Stephen. 1993

机译：高临界转变温度超导体的光发射研究：掺杂依赖性，费米表面，超导间隙和金属-超导体界面。
6. Simple analytical model of the effect of high pressure on the critical temperature and other thermodynamic properties of superconductors [O] . Mateusz Krzyzosiak, Ryszard Gonczarek, Adam Gonczarek, -1

机译：高压对超导体的临界温度和其他热力学性质的影响的简单分析模型
7. Pressure dependence of the superconducting critical temperature of HgBa2Ca2Cu3O9+y and HgBa2Ca3Cu4O10+y up to 3-0 Gpa. [O] . Tristan Jover, D., Wijngaarden, R.J., Wilhelm, H.K., 1996

机译：高达3-0 Gpa的HgBa2Ca2Cu3O9 + y和HgBa2Ca3Cu4O10 + y超导临界温度的压力依赖性。
8. Superconducting Critical Temperatures of Niobium Recovered from Megabar Dynamic Pressures [R] . Nellis, W. J., Moss, W. C., Radousky, H. B., 1985

机译：从megabar动态压力恢复的超导临界铌温度

Comment on 'Superconducting state of Ca-Ⅶ below a critical temperature of 29 K at a pressure of 216 GPa'

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