Quantum Phase Transition of Correlated Iron-Based Superconductivity in LiFe_(1-x)Co_xAs

Yin Jia-Xin; Zhang Songtian S.; Dai Guangyang; Zhao Yuanyuan; Kreisel Andreas; Macam Gennevieve; Wu Xianxin; Miao Hu; Huang Zhi-Quan; Martiny Johannes H. J.; Andersen Brian M.; Shumiya Nana; Multer Daniel; Litskevich Maksim; Cheng Zijia; Yang Xian; Cochran Tyler A.; Chang Guoqing; Belopolski Ilya; Xing Lingyi; Wang Xiancheng; Gao Yi; Chuang Feng-Chuan; Lin Hsin; Wang Ziqiang; Jin Changqing; Bang Yunkyu; Hasan M. Zahid

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Quantum Phase Transition of Correlated Iron-Based Superconductivity in LiFe_(1-x)Co_xAs

机译：Life_（1-x）Co_xas相关铁基超导性的量子相转变

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The interplay between unconventional Cooper pairing and quantum states associated with atomic scale defects is a frontier of research with many open questions. So far, only a few of the high-temperature superconductors allow this intricate physics to be studied in a widely tunable way. We use scanning tunneling microscopy to image the electronic impact of Co atoms on the ground state of the LiFe1-xCoxAs system. We observe that impurities progressively suppress the global superconducting gap and introduce low energy states near the gap edge, with the superconductivity remaining in the strong-coupling limit. Unexpectedly, the fully opened gap evolves into a nodal state before the Cooper pair coherence is fully destroyed. Our systematic theoretical analysis shows that these new observations can be quantitatively understood by the nonmagnetic Born-limit scattering effect in an s +/--wave superconductor, unveiling the driving force of the superconductor to metal quantum phase transition.

机译：与原子尺度缺陷相关的非传统库朋配对和量子状态之间的相互作用是具有许多开放性问题的研究的前沿。到目前为止，只有少数高温超导体允许以广泛的可调节方式研究这种复杂的物理学。我们使用扫描隧道显微镜进行映像CO原子对Life1-Xcoxas系统的地面状态的电子撞击。我们观察到，杂质逐渐抑制全局超导间隙并在间隙边缘附近引入低能量状态，在强耦合极限中保持超导性。出乎意料地，在Cooper对连贯性完全被摧毁之前，完全打开的差距在节点状态下进化到节点状态。我们的系统理论分析表明，通过在S + /波超导体中的非磁性散射散射效果可以定量地理解这些新观察，揭示超导体的驱动力与金属量子相变的驱动力。

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来源
《Physical review letters》 |2019年第21期|217004.1-217004.7|共7页
作者
Yin Jia-Xin; Zhang Songtian S.; Dai Guangyang; Zhao Yuanyuan; Kreisel Andreas; Macam Gennevieve; Wu Xianxin; Miao Hu; Huang Zhi-Quan; Martiny Johannes H. J.; Andersen Brian M.; Shumiya Nana; Multer Daniel; Litskevich Maksim; Cheng Zijia; Yang Xian; Cochran Tyler A.; Chang Guoqing; Belopolski Ilya; Xing Lingyi; Wang Xiancheng; Gao Yi; Chuang Feng-Chuan; Lin Hsin; Wang Ziqiang; Jin Changqing; Bang Yunkyu; Hasan M. Zahid;
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Princeton Univ Dept Phys Lab Topol Quantum Matter & Adv Spect B7 Princeton NJ 08544 USA;

Princeton Univ Dept Phys Lab Topol Quantum Matter & Adv Spect B7 Princeton NJ 08544 USA;

Chinese Acad Sci Inst Phys Beijing 100190 Peoples R China;

Nanjing Univ Informat Sci & Technol Sch Phys & Optoelect Engn Nanjing 210044 Jiangsu Peoples R China;

Univ Leipzig Inst Theoret Phys D-04103 Leipzig Germany;

Natl Sun Yat Sen Univ Dept Phys Kaohsiung 80424 Taiwan;

Chinese Acad Sci Inst Phys Beijing 100190 Peoples R China|Julius Maximilians Univ Wurzburg Inst Theoret Phys & Astrophys D-97074 Wurzburg Germany;

Brookhaven Natl Lab Condensed Matter Phys & Mat Sci Dept Upton NY 11973 USA;

Natl Sun Yat Sen Univ Dept Phys Kaohsiung 80424 Taiwan;

Tech Univ Denmark CNG Dept Phys DK-2800 Lyngby Denmark;

Univ Copenhagen Niels Bohr Inst Univ Pk 5 DK-2100 Copenhagen O Denmark;

Princeton Univ Dept Phys Lab Topol Quantum Matter & Adv Spect B7 Princeton NJ 08544 USA;

Princeton Univ Dept Phys Lab Topol Quantum Matter & Adv Spect B7 Princeton NJ 08544 USA;

Princeton Univ Dept Phys Lab Topol Quantum Matter & Adv Spect B7 Princeton NJ 08544 USA;

Princeton Univ Dept Phys Lab Topol Quantum Matter & Adv Spect B7 Princeton NJ 08544 USA;

Princeton Univ Dept Phys Lab Topol Quantum Matter & Adv Spect B7 Princeton NJ 08544 USA;

Princeton Univ Dept Phys Lab Topol Quantum Matter & Adv Spect B7 Princeton NJ 08544 USA;

Princeton Univ Dept Phys Lab Topol Quantum Matter & Adv Spect B7 Princeton NJ 08544 USA;

Princeton Univ Dept Phys Lab Topol Quantum Matter & Adv Spect B7 Princeton NJ 08544 USA;

Chinese Acad Sci Inst Phys Beijing 100190 Peoples R China;

Chinese Acad Sci Inst Phys Beijing 100190 Peoples R China;

Nanjing Normal Univ Ctr Quantum Transport & Thermal Energy Sci Sch Phys & Technol Jiangsu Key Lab Optoelect Technol Nanjing 210097 Jiangsu Peoples R China;

Natl Sun Yat Sen Univ Dept Phys Kaohsiung 80424 Taiwan;

Acad Sinica Inst Phys Taipei 11529 Taiwan;

Boston Coll Dept Phys Chestnut Hill MA 02467 USA;

Chinese Acad Sci Inst Phys Beijing 100190 Peoples R China;

POSTECH Asia Pacific Ctr Theoret Phys Pohang 790784 Gyeongbuk South Korea|POSTECH Dept Phys Pohang 790784 Gyeongbuk South Korea;

Princeton Univ Dept Phys Lab Topol Quantum Matter & Adv Spect B7 Princeton NJ 08544 USA|Lawrence Berkeley Natl Lab Mat Sci Div Berkeley CA 94720 USA;

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2. Electron doping evolution of structural and antiferromagnetic phase transitions in NaFe_(1-x)Co_xAs iron pnictides [J] . Guotai Tan, Yu Song, Chenglin Zhang, Physical Review. B, Condensed Matter . 2016,第1期

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5. Quantum phase transitions and enhancement of superconductivity by a parallel magnetic field in two dimensional superconductors. [D] . Gardner, H. Jeffrey. 2011

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7. Quantum Phase Transition of Correlated Iron-Based Superconductivity in LiFe1−xCoxAs [O] . Jia-Xin Yin, Songtian S. Zhang, Guangyang Dai, 2019

机译：Life1-Xcoxas相关铁基超导性的量子相转变

Quantum Phase Transition of Correlated Iron-Based Superconductivity in LiFe_(1-x)Co_xAs

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