Quaternary Borocarbides, Superconductors and Hg-based High Tc Superconductors

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Anant Narlikar
Nova Publishers, 1998 - Science - 206 pages
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Contents: Discovery of Superconducting Quaternary Borocarbide System Y-NI-B-C and its Impact on Superconductivity and its Interplay with Magnetism; The Interrelation Between Magnetism and Superconductivity in RNi2B2C (R-Rare Earth); Dependence of Superconductivity and Magnetism on Material Parameters in Quaternary Borocarbides; Properties of RNi2B2C (R-Y, Er) Superconducting Thin Films; Synthesis and Characterisation of the Superconducting Quaternary Intermetallic Compound RNi2B2C -- A Review; Mercury Suprate High-Tc Superconductors: What Do Their Magnetic Properties Reveal?; Synthesis and Characterisation of Bulk HgBa2Can-1CunO2n+2+d (n=1,2,3,4) Superconductors; Preparation of Superconducting Hg-Based Cuprate Thin Films by Means of Annealing of Mercury-Free Precursor Films; Electronic Structure and the van Hove Singularity Scenario in High-Tc HgBa2Can-1CunO2n+2+d Superconductors -- Pressure Effects
 

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Contents

DISCOVERY OF SUPERCONDUCTING QUATERNARY BOROCARBIDE SYSTEM YNIBC AND ITS IMPACT ON SUPERCONDUCTIVITY AN...
1
Structure of RNiBC materials
5
Superconductivity YNiBC System and structural consideration
8
Materials in the Quaternary Borocarbide family
9
Superconducting and magnetic properties of Quaternary Borocarbides
11
Concluding remarks
18
References
19
THE INTERRELATION BETWEEN MAGNETISM AND SUPERCONDUCTIVITY IN RNi₂B₂C RRARE EARTH
27
Conclusion
93
Chapter 5
97
Xray and neutron powder diffraction analysis
99
Summary
107
References
108
WHAT DO THEIR MAGNETIC PROPERTIES REVEAL
113
Overview
114
Reversible properties
116

Basic Concepts
28
Substitution for R
29
Substitution for Ni
37
Conclusions
42
References
44
Chapter 3
47
Sample preparation and experimental
50
Chemical composition and physical properties
51
The effect of thermal treatment
63
Transition metal doped borocarbides
65
Concluding remarks
72
References
73
Chapter 4 PROPERTIES OF RNi₂B₂C RYEr SUPERCONDUCTING THIN FILMS
79
Thin films preparation and structural characteristization
80
DC transport measurements
83
Interplay between magnetism and superconductivity
88
STM tunnelling spectroscopy
89
weal links surface barriers
120
Summary
128
Chapter 7
133
Experimental procedure
135
Results and discussion
137
Conclusions
150
Chapter 8
153
Experimental and results
154
Discussion and conclusions
156
References
157
PRESSURE EFFECTS
159
Theory
163
Calculation and results
165
Conclusions
196
References
197
Subject Index
199
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