Spin fluctuation induced linear magnetoresistance in ultrathin superconducting FeSe films

Journal Article · 21 July 2017 · 2D Materials

DOI: https://doi.org/10.1088/2053-1583/aa8165 · OSTI ID:1429879

Wang, Qingyan ^[1]; Zhang, Wenhao ^[2]; Chen, Weiwei ^[3]; Xing, Ying ^[4]; Sun, Yi ^[1]; Wang, Ziqiao ^[1]; Mei, Jia-Wei ^[5]; Wang, Zhengfei ^[3]; Wang, Lili ^[6]; Ma, Xu-Cun ^[6]; Liu, Feng ^[7]; Xue, Qi-Kun ^[6]; Wang, Jian ^[8]

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1. Peking Univ., Beijing (China). International Center for Quantum Materials, School of Physics
2. Tsinghua University, Beijing (China). State Key Laboratory of Low-Dimensional Quantum Physics, Department of Physics
3. University of Science and Technology of China, Hefei (China). Hefei National Laboratory for Physical Sciences at the Microscale, CAS Key Laboratory of Strongly-Coupled Quantum Matter Physics
4. Peking Univ., Beijing (China). International Center for Quantum Materials, School of Physics; China University of Petroleum, Beijing (China)
5. Univ. of Utah, Salt Lake City, UT (United States). Department of Materials Science and Engineering
6. Tsinghua University, Beijing (China). State Key Laboratory of Low-Dimensional Quantum Physics, Department of Physics; Collaborative Innovation Center of Quantum Matter, Beijing (China)
7. Univ. of Utah, Salt Lake City, UT (United States). Department of Materials Science and Engineering ; Collaborative Innovation Center of Quantum Matter, Beijing (China)
8. Peking Univ., Beijing (China). International Center for Quantum Materials, School of Physics; Tsinghua Univ., Beijing (China). State Key Laboratory of Low-Dimensional Quantum Physics, Department of Physics; Collaborative Innovation Center of Quantum Matter, Beijing (China)

The discovery of high-temperature superconductivity in FeSe/STO has trigged great research interest to reveal a range of exotic physical phenomena in this novel material. Here we present a temperature dependent magnetotransport measurement for ultrathin FeSe/STO films with different thickness and protection layers. Remarkably, a surprising linear magnetoresistance (LMR) is observed around the superconducting transition temperatures but absent otherwise. The experimental LMR can be reproduced by magnetotransport calculations based on a model of magnetic field dependent disorder induced by spin fluctuation. Thus, the observed LMR in coexistence with superconductivity provides the first magnetotransport signature for spin fluctuation around the superconducting transition region in ultrathin FeSe/STO films.

• Research Organization: Univ. of Utah, Salt Lake City, UT (United States)
• Sponsoring Organization: USDOE Office of Science (SC), Basic Energy Sciences (BES)
• Grant/Contract Number: FG02-04ER46148
• OSTI ID: 1429879
• Journal Information: 2D Materials, Vol. 4, Issue 3; ISSN 2053-1583
• Publisher: IOP PublishingCopyright Statement
• Country of Publication: United States
• Language: English