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Growth of high quality Sr2IrO4 epitaxial thin films on conductive substrates

Chinese Physics B 2019年第7期28卷 490-494页

作者： Hui Xu Zhangzhang Cui Xiaofang Zhai Yalin Lu Hefei National Laboratory for Physical Sciences at the Microscale University of Science and Technology of China Hefei 230026 China National Synchrotron Radiation Laboratory University of Science and Technology of China Hefei 230026 China Synergy Innovation Center of Quantum Information and Quantum Physics University of Science and Technology of China Hefei 230026 China Department of Materials Science and Engineering University of Science and Technology of China Hefei 230026 China

Ruddlesden–Popper iridium oxides have attracted considerable interest because of the many proposed novel quantum states that arise from the large spin–orbit coupling of the heavy iridium atoms in them.A prominent example is the single layer Sr2IrO4, in which superconductivity has been proposed under electron ***, the synthesis of Sr2IrO4 high quality thin films has been a huge challenge due to the easy formation of impurities associated with different numbers of SrO *** techniques to optimize the growth of pure phase Sr2IrO4 are urgently *** we report the deposition of high quality Sr2IrO4 thin films on both insulating SrTiO3 and conducting SrTiO3:Nb substrates using pulsed laser deposition assisted with reflective high-energy electron *** optimal deposition temperature of Sr2IrO4 epitaxial films on SrTiO3:Nb substrates is about 90℃ lower than that on SrTiO3 *** electrical transports of high quality Sr2IrO4 films are measured, which follow the three-dimensional Mott variable-range hopping *** film magnetizations are measured, which show weak ferromagnetism below ~240 K with a saturation magnetization of~ 0.2 μB/Ir at 5 *** study provides applicable methods to prepare high quality 5 d Sr2IrO4 epitaxial films, which could be extended to other Ruddlesden–Popper phases and potentially help the future study of exotic quantum phenomena in them.

关键词： substrates pulsed laser deposition iridates conduction mechanism

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Enhanced conductivity and weakened magnetism in Pb-doped Sr_(2)IrO_(4)

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Chinese Physics B 2024年第1期33卷 680-685页

作者：岳智来甄伟立牛瑞焦珂珂朱文卡皮雳张昌锦 High Magnetic Field Laboratory Hefei Institutes of Physical ScienceChinese Academy of SciencesHefei 230031China Science Island Branch of Graduate School University of Science and Technology of ChinaHefei 230026China Collaborative Innovation Center of Advanced Microstructures Nanjing UniversityNanjing 210093China

Group IV element Pb has been selected as the dopant to dope at the Sr site of Sr_(2)IrO_(4). It is exciting to find that the single-phase crystal structure could be maintained with a high Pb doping level of up to x=0.3 in Sr_(2-x)Pb_(x)IrO_(4). The mapping data obtained from energy-dispersive x-ray spectroscopy analyses give solid evidence that the Pb ions are uniformly distributed in the Sr_(2)IrO_(4) matrix. The incorporation of Pb leads to a moderate depression of the canted antiferromagnetic ordering state. The electrical conductivity could be greatly enhanced when the Pb doping content is higher than x=*** present results give a fresh material base to explore new physics in doped Sr_(2)IrO_(4) systems.

关键词： iridates doping conductivity magnetism

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Growth of high-quality perovskite (110)-SrIrO_3 thin films using reactive molecular beam epitaxy

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Chinese Physics B 2018年第8期27卷 578-581页

作者： Kai-Li Zhang Cong-Cong Fan Wan-Ling Liu Yv -Feng Wu Xiang-Le Lu Zheng-Tai Liu Ji-Shan Liu Zhong-Hao Liu Da-Wei Shen State Key Laboratory of Functional Materials for Informatics Shanghai Institute of Microsystem and Information Technoloy（SIMIT）Chinese Academy of Sciences（CAS）Shanghai 200050Chia University of Chinese Academy of Sciences Beijing 100049China School of Physicai Science and Technology ShanghaiTech UniversityShanghai 200031China CAS Center for Excellence in Superconducting Electronics（CENSE） Shanghai 200050China

Recently, 5d transition metal iridates have been reported as promising materials for the manttfacture of exotic quan- tum states. Apart from the semimetallic ground states that have been observed, perovskite SrlrO3 is also predicted to have a lattice-symmetrically protected topological state in the （110） plane due to its strong： spin-orbil coupling and electron correlation. Compared with non-polar （001）-SflrO3, the especial polarity of （110）-SrIrC）3 undoubtedly adds the： difficulty of fabrication and largely impedes the research on its surface states. Here, we have successfully synthesized high-quality （110）-SflrO3 thin films on （110）-SrTiO3 substrates by reactive molecular beam epitaxy fi^r the first time. Both reflec- tion high-energy electron diffraction pattems and x-ray diffraction measurements suggest the expected orientation and outstanding crystallinity. A （1 × 2） surface reconstruction driven from the surface instabiJity, the. same as that reported in （110）-SrTiO3, is observed. The electric transport measurements uncover that （110）-SrIrO3 exhibits a more prominent semimetallic property in comparison to （001）-SrIrO3.

关键词： molecular beam epitaxy iridates topological crystalline metal sunace reconstruction

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Superconductivity from buckled-honeycomb-vacancy ordering

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Science Bulletin 2021年第4期66卷 327-331,M0003页

作者： Yanpeng Qi Tianping Ying Xianxin Wu Zhuoya Dong Masato Sasase Qing Zhang Weiyan Liu Masaki Ichihara Yanhang Ma Jiangping Hu Hideo Hosono School of Physical Science and Technology ShanghaiTech UniversityShanghai 201210China Materials Research Center for Element Strategy Tokyo Institute o f TechnologyYokohama 226-8503Japan Institut fur Theoretische Physik und Astrophysik Julius-Maximilians-Universitat WurzburgWurzburg 97074Germany Beijing National Laboratory for Condensed Matter Physics and Institute of Physics Chinese Academy of Sciences.Beijing 100190China

Vacancies are prevalent and versatile in solid-state physics and materials *** role of vacancies in strongly correlated materials,however,remains uncultivated until ***,we report the discovery of an unprecedented vacancy state forming an extended buckled-honeycomb-vacancy(BHV)ordering in *** emerges by suppressing the BHV ordering through squeezing of extra Ir atoms into the vacancies or isovalent Rh *** phase diagram on vacancy ordering reveals the superconductivity competes with the BHV *** theoretical calculations suggest that this ordering originates from a synergistic effect of the vacancy formation energy and Fermi surface nesting with a wave vector of(1/3,1/3,0).The buckled structure breaks the crystal inversion symmetry and can mostly suppress the density of states near the Fermi *** peculiarities of BHV ordering highlight the importance of"correlated vacancies"and may serve as a paradigm for exploring other non-trivial excitations and quantum criticality.

关键词： Superconductivity Vacancies iridates Phase diagram

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Novel Synthesis Method of Nonst0ichiometric Na2-xlrO3 Crystal Structure, Transport and Magnetic Properties

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Journal of Chemistry and Chemical Engineering 2016年第4期10卷 153-160页

作者： Katharina Rolfs Ekaterina Pomjakushina Denis Sheptyakov Kazimierz Conder Laboratory for Scientific Development and Novel Materials Paul Scherrer Institute Hlligen PSI 5232 Switzerland Laboratory for Neutron Scattering and lmaging Paul Scherrer Institute Villigen PSI 5232 Switzerland

Transition metal oxides with 4d or 5d metals are of great interest due to the competing interactions, of the Coulomb repulsion and the itineracy of the d-electrons, opening a possibility of building new quantum ground states. Particularly the 5d metal oxides containing Iridium have received significant attention within the last years, due to their unexpected physical properties, caused by a strong spin orbit coupling observed in It（IV）. A prominent example is the Mott-insulator Sr2IrO4. Another member of this family, the honeycomb lattice compound Na2IrO3, also being a Mott-insulator having, most probably, a Kitaev spin liquid ground state. By deintercalating sodium from Na2IrO3, the authors were able to synthesize a new honeycomb lattice compound with more than 50% reduced sodium content. The reduction of the sodium content in this layered compound leads to a change of the oxidation state of iridium from ＋ IV to ＋ V/＋ VI and a symmetry change from C2/c to P-3. This goes along with significant changes of the physical properties. Besides the vanishing magnetic ordering at 15 K, also the transport properties changes and instead insulating semiconducting properties are observed.

关键词： Strongly correlated electron systems iridates oxidation neutron diffraction

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