Mapping the electronic structure of each ingredient oxide layer of high T c cuprate superconductors
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1 IASTU Physics Seminar Mapping the electronic structure of each ingredient oxide layer of high T c cuprate superconductors Can-Li Song( 宋灿立 ) Department of Physics, Tsinghua University October 28, 2015
2 Acknowledgements Leader : Qi Kun Xue Colleagues: Xu Cun Ma, Lili Wang, Xi Chen, Ke He, Shuaihua Ji Students: Yan Feng Lv, Wen Lin Wang, Jun Ping Peng, Hao Ding, Yang Wang, Yong Zhong, Sha Han, Yi Min Zhang Bi 2212 samples: Ruidan Zhong, John Schneeloch, Gen Da Gu Bi 2201 samples: Lin Zhao, Xing Jiang Zhou $$$: NSFC & MOST of China
3 High T c Cuprate Superconductors Bednorz and Müller, Z. Phys. B 64, 189 (1986) Keimer, Natrue 518, 179 (2015) Ba 0.75 La 4.25 Cu 5 O 5(3-y) Unsolved issues of high-t c superconductors: Sophisticated phase diagram 1) Electron pairing mechanism: spin fluctuation? 2) Various sorts of charge orders and their interplay with superconductivity? 3) The nature of non-fermi liquid behavior (strange metal)? 4) Pseudogap and its connection with superconductivity as well as broken-symmetry states?
4 Pseudogap of Cuprates by STM Renner, PRL 80, 149 (1998) Nakano, JPSJ 67, 2622 (1998) T* versus p: linear behavior Spectral depletion at E F above T c T c versus p: dome-shaped behavior
5 1) Precursor pairing Possible Origin for Pseudogap 2) A non superconducting related pseudogap, e.g. various broken-symmetry states Checkerboard Fluctuating Stripes Static Striped DOS CDW Hoffman, Science 295, 466 (2002) Parker, Nature 468, 677 (2010) Howald, PRB 67, (2003) Wise, Nat Phys. 4, 696(2008) Electronic cluster glass Nematic and Smectic Kohsaka, Science (2007) Lawler, Nature 466, 7304 (2010)
6 Challenges and Opportunity Strongly correlated electron systems Structural complexity Superconducting CuO 2 layer, charge reservoir building layer (for example, BiO/SrO in Bi-2212) Unattainable CuO 2 layers Surface-sensitive measurements on the vacuum cleaved BiO planes: the properties of superconducting CuO 2 planes? Possible path to address the challenges Atomic-layer-resolved spectral study of cuprates Argon-ion sputtering and annealing (IBA) Up-Down Cuprates
7 MBE + LT STM/STS + magnetic field + IBA A precise control of growth flux Metal sources (99.999%) : evaporated from standard Knudsen cells STM/STS: 0.4 K, 4.3 K, 78K Magnetic field: 11 T Vacuum: 5x10 11 Torr Ar + gun MBE Ozone-assisted MBE To MBE STM Ozone system (Fermi Instruments)
8 IBA on Bi 2212 Multilayerd structure IBA 100 nm 100 nm 100 nm 100 nm Increasing IBA cycles Bi 2 Sr 2 CaCu 2 O 8+ (Bi2212) 200 nm 200 nm Deeper and deeper atomic layers of Bi-2212 are exposed with increasing IBA.
9 STS spectra on as sputtered Bi 2212 Misra, PRL. 89, (2002) Contrasting spectral feature between BiO and CuO 2 A substantial loss of near-surface oxygen dopants during IBA Asymmetric gap of CuO 2 planes, neither superconducting gap nor pseudogap
10 Post anneal under Ozone Flux BiO(I) A precise control of oxygen stoichiometry!
11 Atomic Layer Resolved Spectra of Bi 2212 BiO(I) Single dominant pseudogap
12 Atomic Layer Resolved Spectra of Bi 2212 SrO(I) Van Hove singularity
13 Atomic Layer Resolved Spectra of Bi 2212 Robust VHS on SrO planes!
14 Atomic Layer Resolved Spectra of Bi 2212 CuO 2 (I) Two-gap spectral feature
15 Atomic Layer Resolved Spectra of Bi 2212 CuO 2 (II) Two-gap spectral feature
16 Atomic Layer Resolved Spectra of Bi 2212 BiO(II) Single dominant pseudogap again
17 Pseudogap: a property of BiO BiO x Bi-2212 Pseudogap on MBE-grown BiO x islands
18 Spectra of superconducting CuO 2 layers 4.2 K 4.2 K 78 K Robust two-gap feature on CuO 2 The smaller gap becomes invisible near T c follows a dome-shaped behavior, like T c 2 /k B T c = Preparation and direct measurements of CuO 2 Superconducting layers are so essential!!! arxiv:
19 d wave Pseudogap in Noncuprate Compounds La 1.2 Sr 1.8 Mn 2 O 7 manganites Meatllic nickelate R 2-x SrNiO 4 (R=Nd, Eu) Shen, Nature 438, 474 (2005) Uchida, PRL 106, (2011) Alkali-metal doped Sr 2 IrO 4 Fermi arc and d-wave gap are not unique to cuprates Kim, Science 345, 187 (2014) & Nature Physics (2015)
20 Summary and Perspective Atomic-layer-resolved electronic structures of cuprates Pseudogap and VHS: possibly a property of oxygen-doped oxides Real superconducting gap in CuO 2 layer SrO/BiO: VHS and acts carrier reservoir for CuO 2 Bottom-Up (MBE) & Top-Down (IBA) strategies Thank You Very Much!
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