PLD Growth of Novel Superconducting Thin film (Sr2RuO4, Fe1-xSe)

• Main Authors: Huyan, Shuyuan, 呼延澍元
• Other Authors: Kwo, J. Raynien
• Format: Others
• Language: en_US
• Published: 2014
• Online Access: http://ndltd.ncl.edu.tw/handle/65239518376219891250

碩士 === 國立清華大學 === 物理系 === 102 === Pulsed Laser deposition (PLD) is an important instrument for thin film growth in scientific research. It is widely applicable for a variety of materials especially for complex oxide which has high melting point and firm structure. However the PLD is sometimes not the proper homo-epitaxy because elements have different atomic mass, vapour pressure, ionization energy and chemical stability. So it is not easy to avoid non-homogeneous deposition unless getting the optimized growth parameters or finding some ways to cover the “deficit” In this thesis, we introduce effective methods for high quality thin film growth of Ruddlesden-Popper series complex oxide by Laser Molecular Beam Epitaxy (LMBE) including ferromagnetic SrRuO3 and chiral p-wave superconductor Sr2RuO4, in which Ru, as a volatile element, is very easy to form deficiencies during the process of thin film growth. Sr2RuO4 is the potential host of Half-quantum vortex (HQV), the Majorona zero mode is predicted exist in the core of HQV. So there will be a big scientific research value to fabricate high quality superconducting thin film of Sr2RuO4. On the other hand, we make use of experience we had accumulated to fabricate Fe1-xSe thin film such as pure Fe4Se5 in order to complete the phase diagram of High Tc Fe-pnictide superconductor, which will help us to understand the mechanism of High Tc superconductivity better.