金魁

本课题组研究方向可概括为“基于高通量组合薄膜技术探索新（超导）材料及物理研究”。

1.寻找新的(超导)材料。以先进的高通量合成技术为主要手段，制备外延组合薄膜及界面。超导薄膜通常是在超导多晶材料报道后才陆续被制备出来，但通过组合制备方法可以在同一块衬底上制备出连续组分且空间可分辨的高质量外延薄膜。高通量组合制备及微区高速表征技术是材料基因计划（Materials Genome Initiative）的核心技术，可加速材料研发周期，保障新（超导）材料探索的可执行性。此外制备异质结/超晶格，利用界面发现新超导材料或者提高超导转变温度亦是我们感兴趣的研究内容。

2.探索高温超导机理。选取对机理理解至关重要却缺乏高质量单晶块体的氧化物体系，制备出高质量的（亚稳态）单晶薄膜。工作围绕高温超导体系中与机理密切相关的量子临界效应来展开，包括组分掺杂、强磁场、静电场等多种调控手段。发挥组合外延薄膜的优势深入挖掘高温超导体系的多维电子态相图，揭示其丰富的物理内容。

1.在高温超导体机理研究方面，a）国际上第一次从实验上给出了电子型铜氧化物过掺杂区域完整的相图（测量至20mK），该相图已被著名理论学家D.Scalapino在2012年为Rev. Mod. Phys.上撰写的综述所采用。b）首次发现电子型铜氧化物中超导电性和线性电阻（高温超导领域中常提到的“strange metal”）的散射率的强度密切相关。c）首次揭示电子型铜氧化物体系和超导边界有关的第二种量子涨落。相关结果以第一作者发布在Nature(2011)和PNAS(2012)上，并在2012美国APS March Meeting邀请专场做邀请报告。

2.制备高质量的唯一尖晶石氧化物超导单晶薄膜，结合电输运和点接触隧道谱首次获得该体系的电子态相图，发现随温度升高其超导态上方存在轨道相关序，继续升温进入自旋涨落区域（详细请点击）。部分结果发表在Nature Commun.（2015）。

3.在探索新超导体方面，通过高通量组合薄膜技术发现了一种新的超导材料，是该技术迄今所发现的第一个新超导材料，部分结果发布在APL Mater.(2013)上。在建设与发展高通量组合薄膜生长和微区测量设备方面，自2013年已申请相关发明专利逾10项。

[20] G. He, Y.L. Jia, X.Y. Hou, Z.X. Wei, H.D. Xie, Z.Z. Yang, J. Yuan, L. Shan, B.Y. Zhu, H. Li, L. Gu, K. Liu, T. Xiang and K. Jin,Observation of anisotropic electronic correlations in the spinel oxide superconductor

[19] M. C. Wang, H. S. Yu, Y. -F. Yang, S. N. Luo, K. Jin, and J. Qi, Interplay between 2D antiferromagnetic correlations and superconductivity in oxygen-tuned La2-xCexCuO4±δ revealed by ultrafast optical spectroscopy

[18] H.S. Yu, G. He, Z.Q. Lin, J. Yuan, B.Y. Zhu, Y.F. Yang, T. Xiang, F.V. Kusmartsev, L. Li, J.F. Wang, and K. Jin, A close look at antiferromagnetism in multidimensional phase diagram of electron-doped copper oxide

[17] D.N. Yuan, J. Yuan, Y.L. Huang, S.L. Ni, Z.P. Feng, H.X. Zhou, K. Jin, G.M. Zhang, X.L. Dong, F. Zhou, and Z.X. Zhao, Observation of Ising spin-nematic order and its close relationship to the superconductivity in FeSe single crystals, Phys. Rev

[16] X. Zhang, H.S. Yu, G. He, W. Hu, J. Yuan, B.Y. Zhu, and K. Jin, Transport anomalies and quantum criticality in electron-doped cuprate superconductors,

[15] K. Jin, W. Hu, B.Y. Zhu, D. Kim, J. Yuan, Y.J. Sun, T. Xiang, M.S. Fuhrer, I. Takeuchi, and R.L. Greene, Evolution of electronic states in n-type copper oxide superconductor via electric double layer gating, Sci

[14] J. Yuan, G. He, H. Yang, Y. Shi, B.Y.Zhu and K. Jin, Research trends in electron-doped cuprate superconductors, Sci. China-Phys. Mech. Astron

[13] X. Dong, K. Jin, D.N. Yuan, H.X. Zhou, J. Yuan, Y.L. Huang, W. Hua, J.L. Sun, P. Zheng, W. Hu, Y.Y. Mao, M.W. Ma, G.M. Zhang, F. Zhou, and Z.X. Zhao, (Li0.84Fe0.16)OHFe0.98Se superconductor: Ion-exchange synthesis of large single crystal and anomalous normal state properties, Phys. Rev

[12] K. Jin, G. He, X. Zhang, S. Maruyama, S. Yasui, R. Suchoski, J. Shin,Y. Jiang, H.S. Yu, J. Yuan, L. Shan, F.V. Kusmartsev, R. L. Greene, and I.Takeuchi, Anomalous magnetoresistance in the spinel superconductor LiTi2O4, Nature Commun

[11] X. Dong, H.X. Zhou, H.X. Yang, J. Yuan, K. Jin, F. Zhou, D.N. Yuan, L.L. Wei, J.Q. Li, X.Q. Wang, G.M. Zhang, and Z.X. Zhao, Phase diagram of (Li1-xFex)OHFeSe: a bridge between iron selenide and arsenide superconductors, J. Am. Chem

[10] H. Saadaoui, Z. Salman, H. Luetkens, T. Prokscha, A. Suter, W.A. MacFarlane, Y. Jiang, K. Jin, R.L. Greene, E. Morenzoni, and R.F. Kiefl, The phase diagram of electron-doped La2-xCexCuO4-δ, Nature Commun

[9] K. Jin, R. Suchoski, S. Fackler, Y. Zhang, X. Pan, R. L. Greene, and I. Takeuchi, Combinatorial search of superconductivity in Fe-B composition spreads, APL Mater

[8] N. P. Butch*, K. Jin*, K. Kirshenbaum, R. L. Greene, and J. Paglione, Quantum critical scaling at the edge of Fermi liquid stability in a cuprate superconductor, Proc. Natl. Acad

[7] K. Jin, N. P. Butch, K. Kirshenbaum, J. Paglione, and R. L. Greene, Link between spin fluctuations and electron pairing in copper oxide superconductors, Nature

[6] K. Jin, P. Bach, X. H. Zhang, U. Grupel, E. Zohar, I. Diamant, Y. Dagan, S. Smadici, P. Abbamonte, and R. L. Greene, Anomalous enhancement of the superconducting transition temperature of electron-doped La2-xCexCuO4 and Pr2-xCexCuO4 cuprate heterostructures, Phys

[5] K. Jin, X.H. Zhang, P. Bach, and R.L. Greene, Evidence for antiferromagnetic order in La2-xCexCuO4 from angular magnetoresistance measurements, Phys

[4] K. Jin, B. Y. Zhu, B. X. Wu, L. J .Gao, and B. R. Zhao, Low temperature Hall effect in electron-doped superconductor La2-xCexCuO4 thin films, Phys

[3] K. Jin, B. Y. Zhu, B. X. Wu, J. Vanacken, V. V. Moschalkov, B. Xu, L. X. Cao, X. G. Qiu, and B. R. Zhao, Normal-state transport in electron-doped La2-xCexCuO4 thin films in magnetic fields up to 40 Tesla, Phys. Rev

[2] K. Jin, B. Y. Zhu, J. Yuan, H. Wu, L. Zhao, B. X. Wu, Y. Han, B. Xu, L. X. Cao, X. G. Qiu, and B. R. Zhao, Evolution of Charge Carriers for transport in electron-doped cuprate superconductor La1.89Ce0.11CuO4 thin films, Phys

[1] K. Jin, J. Yuan, L. Zhao, H. Wu, X. Y. Qi, B. Y. Zhu, L. X. Cao, X. G. Qiu, B. Xu, X. F. Duan, and B. R. Zhao, Coexistence of superconductivity and ferromagnetism in a dilute cobalt-doped La1.89Ce0.11CuO4±δ system, Phys. Rev

1.电子型高温超导铜氧化物体系。包括量子临界点的确认和调控，测量包括电磁、热及点接触隧道谱等，最终建立以铈、氧为化学参量，含温度、磁场等变量的高维相图。通过与空穴型体系的对比，理解铜氧化物的超导机制。

2.其它氧化物超导体系薄膜的制备及物理研究，如唯一尖晶石结构氧化物超导体等。

3.自主设计各类微区快速表征系统以及原位表征系统，适应高通量材料的表征需求。应用高通量组合薄膜制备与快速表征技术探索新（超导）材料。

4.寻找新的界面超导体系。以超薄膜或各类有序量对界面的调制为突破口，获取更高的超导转变温度。