3的大晶體。通過X射線衍射分析,確定晶體為基面為(101)面的四方β-FeSe超導(dǎo)相。磁性測(cè)量表明晶體在9k時(shí)發(fā)生了超導(dǎo)轉(zhuǎn)變；四探針法測(cè)量表明伴隨著較寬的轉(zhuǎn)變溫度范圍,晶體在10K時(shí)電阻值降為零,起始轉(zhuǎn)變溫度為15K。本研究為制備大尺寸FeSe單晶提供了一種便利簡(jiǎn)捷的方法,對(duì)于FeSe基超導(dǎo)體的研究具有廣闊的應(yīng)用前景。"/>

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FeSe晶體生長(zhǎng)和超導(dǎo)性能研究
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作者單位:

1.清華大學(xué) 新型陶瓷與精細(xì)工藝國家重點(diǎn)實(shí)驗(yàn)室;2.南京郵電大學(xué) 江蘇省新能源技術(shù)工程實(shí)驗(yàn)室

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通訊作者:

中圖分類號(hào):

O782

基金項(xiàng)目:

National Science Foundation of China (51590893 and 51788104); National Key R&D Program of China (2017YFA0700705); 1000 Plan Program for Young Talents of China.


Large FeSe single crystal growth and its superconducting property
Author:
Affiliation:

1.State Key Lab of New Ceramics and Fine Processing,School of Materials Science and Engineering,Tsinghua University;2.New Energy Technology Engineering Lab of Jiangsu Province,School of Science,Nanjing University of Posts Telecommunications NUPT

Fund Project:

National Science Foundation of China

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    摘要:

    層狀FeSe是一種重要的超導(dǎo)材料,但生長(zhǎng)大尺寸的晶體使得深入探究其超導(dǎo)機(jī)理變得困難。在本研究中,我們利用了簡(jiǎn)單的KCl熔鹽法生長(zhǎng)晶體,通過在熔劑內(nèi)部控制溫度梯度,生長(zhǎng)得到了尺寸為7×2×2mm3的大晶體。通過X射線衍射分析,確定晶體為基面為(101)面的四方β-FeSe超導(dǎo)相。磁性測(cè)量表明晶體在9k時(shí)發(fā)生了超導(dǎo)轉(zhuǎn)變；四探針法測(cè)量表明伴隨著較寬的轉(zhuǎn)變溫度范圍,晶體在10K時(shí)電阻值降為零,起始轉(zhuǎn)變溫度為15K。本研究為制備大尺寸FeSe單晶提供了一種便利簡(jiǎn)捷的方法,對(duì)于FeSe基超導(dǎo)體的研究具有廣闊的應(yīng)用前景。

    Abstract:

    Layered FeSe has become one important superconducting material, but the major challenge in the growth of large crystal makes it difficult to further clarify the underlying superconducting mechanism. In this research, large crystals with a typical size of 7×2×2 mm3 are obtained simply by using KCl flux with a controlled temperature gradient inside the flux. Superconducting tetragonal β-FeSe phase with the basal plane of (101) face is identified by X-ray diffraction analysis. The super large crystals show outstanding superconducting performance with transition happened at 9 K according to the DC magnetization measurements and broad resistive transition to zero resistance at 10 K with an onset temperature of 15 K. Our work has provided a convenient method to synthesis large FeSe single crystals which is promising in investigations of FeSe-based superconductors.

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黃語嘉,邢巖,潘偉,萬春磊. FeSe晶體生長(zhǎng)和超導(dǎo)性能研究[J].稀有金屬材料與工程,2021,50(2):425~429.[Yujia Huang, Yan Xing, Wei Pan, Chunlei Wan. Large FeSe single crystal growth and its superconducting property[J]. Rare Metal Materials and Engineering,2021,50(2):425~429.]
DOI：10.12442/j. issn.1002-185X.20191082

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  • 收稿日期:2019-12-23
  • 最后修改日期:2020-03-16
  • 錄用日期:2020-03-19
  • 在線發(fā)布日期: 2021-03-09
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