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High-Temperature Superconductor Experiment Series

Explore crystal growth, transition temperature measurement, X-ray diffraction, Cu spin-echo NMR spectrum, and future work in the department of physics at Fudan University. Motivation includes theoretical predictions and experimental observations leading to a new paradigm in electron systems physics. Crystal growth involves the floating zone technique to produce large, high-quality single crystals for study. Measurement of superconductor transition temperature, X-ray powder diffraction, Cu spin-echo NMR spectrum, and future work outline are provided. Successful experiments demonstrate high-quality research output.

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High-Temperature Superconductor Experiment Series

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  1. 高温超导系列实验 Department of Physics, Fudan University Zhang Chi 06301020080

  2. OUTLINE • Motivation • Crystal Growth • Transition temperature measurement of superconductor • X-ray powder diffraction • Cu spin-echo NMR spectrum • Future work

  3. MOTIVATION • Theoretical Prediction • Fermi-liquid theory : particles (with charge and spin) • Luttinger liquids theory : Spin–Charge Separation: holons (charge with no spin) and spinons (spin with no charge) • Experimental Observation • Completely new paradigm for the physics of electron systems • ARPES • Thermal conductivity measurements

  4. Single Crystal Growth of 1-D SrCuO2 • Structure : One dimensional: Linear Zigzag Ladder • Floating Zone technique: • Produce Large High Quality Single Crystal

  5. weight • Mix and ground • bake SrCO3 CuO Hydrostatic press Initial materials Vertical furnace Floating Zone Furnace

  6. Operating procedure • Prepare for sample stick Hydrostatic press

  7. Sintering preparation for sample stick • Sintering of sample stick Vertical Furnace

  8. Optical Floating Zone Furnace • feed rod • flux • seed rod

  9. 超导转变温度（Tc）测量 • 零电阻现象 (R=0) • 迈斯纳（Meissner）效应 (B=0) R-T测量装置 实验线路图 （四引线法） • Tc = 98 K • 从高温到低温

  10. X射线粉末（多晶）衍射 (YBCO) Sinθ=nλ/2 d 衍射峰位置2θ，衍射峰强度I，衍射峰形状f(x) a= 0.382 b= 0.388 c= 1.169

  11. XRD ( SrCuO2) Polycrystalline Single Crystal

  12. 金属的自旋回波频谱 Phys.Rev.B 69,132415(2004)

  13. ARPES spin–charge separation Thermal conductivity B.J.Kim, et al. Nature 2,397(2006) A.V. Sologubenko, et al. Phys. Rev. B 64, 054412 (2001)

  14. Thank you !

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