Dữ liệu biên mục

Visualising the charge and Cooper-pair density waves in cuprates
Loại tài liệu: Book
Mã tài liệu: 97288
Mã ngôn ngữ: en
Tác giả: Edkins, Stephen
Thông tin xuất bản: Springer
Tình trạng vật lý: 193 p.
Từ khóa: Scanning tunneling microscopy;High temperature superconductors.
Danh mục: Khoa học tự nhiên nói chung
Năm xuất bản: 2017
Số sách còn lại: Không giới hạn
Thời gian mượn: Bạn chưa đăng nhập.
Tóm tắt theo nội dung: This thesis reports on the use of scanning tunnelling microscopy to elucidate the atomic-scale electronic structure of a charge density wave, revealing that it has a d-symmetry form factor, hitherto unobserved in nature. It then details the development of an entirely new class of scanned probe: the scanning Josephson tunnelling microscope. This scans the Josephson junction formed between a cuprate superconducting microscope tip and the surface of a cuprate sample, thereby imaging the superfluid density of the sample with nanometer resolution. This novel method is used to establish the existence of a spatially modulated superconducting condensate, something postulated theoretically over half a century ago but never previously observed.
Tóm tắt theo mục lục: Supervisor's Foreword; Abstract; Acknowledgements; Contents; 1 Introduction to Unconventional Superconductivity and Density Waves in Cuprates; 1.1 Superconductivity; 1.1.1 What Is a Superconductor?; 1.1.2 BCS Theory of Superconductivity; 1.2 High-Temperature Unconventional Superconductivity in Cuprates; 1.2.1 Effective Models of the CuO2 Plane; 1.2.2 Phase Diagram; 1.2.3 Anti-Ferromagnetism; 1.2.4 High-Temperature d-Wave Superconductivity; 1.2.5 Strange Metal; 1.2.6 The Pseudogap; 1.3 Charge Density Waves; 1.4 Unconventional Density Waves in Cuprates; 1.5 The Significance of CDW in Cuprates.1.6 Organisation of This ThesisReferences; 2 Spectroscopic-Imaging STM (SI-STM); 2.1 Quantum Tunnelling as a Spectroscopy; 2.1.1 Tunnelling Hamiltonian Formalism; 2.1.2 Normal-Insulator-Normal (NIN) Tunnelling; 2.1.3 Superconductor-Insulator-Normal (SIN) Tunnelling; 2.1.4 Superconductor-Insulator-Superconductor (SIS) Tunnelling; 2.2 STM -- Principles; 2.3 STM -- Modes of Operation; 2.3.1 Topography; 2.3.2 Spectroscopy; 2.4 SI-STM; 2.4.1 The Setup Effect; 2.4.2 Spectroscopic Functions g(""0245r, E), I(""0245r, E), Z(""0245r, E), and R(""0245r, E); 2.5 Experimental Apparatus; 2.5.1 STM Head.4 Atomic-Scale Electronic Structure of the Cuprate d-Symmetry Form Factor Charge Density Wave4.1 Form Factor Decomposition of Modulations in the CuO2 Plane; 4.2 Proposals for a d-Symmetry Form Factor CDW in Cuprates; 4.3 SI-STM Signatures of a d-Symmetry Form Factor CDW; 4.4 Detection of a d-Symmetry Form Factor CDW in Cuprates; 4.4.1 Form Factor Measurement Using Sub-Lattice Segregated SI-STM; 4.4.2 Temperature Dependence of the CDW Phenomena; 4.4.3 Short-Range Unidirectional CDW Domains; 4.5 Characteristics of CDW Modulations in the Spectral Function.4.6 Phase Relationship Between the Modulation of Filled and Empty States4.7 Doping-Dependence of the CDW Wave-Vector; 4.8 Conclusions and Proposed Future Experiments; References; 5 The Scanned Josephson Tunnelling Microscope; 5.1 Fundamentals of SJTM Operation; 5.2 The Josephson Effect as a Measure of the Superconducting Order Parameter; 5.3 Josephson Current-Voltage Characteristics in Ultra-small Junctions; 5.3.1 I(VJJ) Characteristics for Josephson Junctions with Strong Phase Coupling; 5.3.2 Thermal Phase Fluctuations in Ultra-small Josephson Junctions.
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