Related Experiment Video
Updated: Jul 12, 2026

05:39
Scalable Quantum Integrated Circuits on Superconducting Two-Dimensional Electron Gas Platform
Published on: August 2, 2019
Tuning High-Tc Superconductors via Multistage Intercalation
Summary
By inserting iodine atoms, scientists tuned the interaction between CuO(2) sheets in high superconducting transition temperature (high-T(c)) superconductors. This decoupling reduced the superconducting transition temperature by approximately 5 K per layer.
Area of Science:
- Materials Science
- Condensed Matter Physics
- Solid State Chemistry
Background:
- The high-T(c) superconductor Bi(2)Sr(2)CaCu(2)Ox features adjacent blocks of CuO(2) sheets.
- Tuning the interaction between these blocks is crucial for understanding and optimizing superconductivity.
Purpose of the Study:
- To investigate the effect of multistage intercalation on the interaction between CuO(2) sheets.
- To determine the relationship between interlayer coupling and superconducting transition temperature (T(c)).
Main Methods:
- Multistage intercalation of iodine atoms into BiO bilayers.
- Atomic-resolution transmission electron microscopy (ARTEM) for structural analysis.
- Measurement of superconducting transition temperatures for pristine and intercalated samples.
Main Results:
- Iodine atoms were successfully intercalated into BiO bilayers, forming structures with stage index n up to 4 (IBi2nSr2nCanCu2nOx).
- Each intercalated BiO bilayer expanded the structure by 3.6 angstroms, decoupling adjacent CuO(2) sheets.
- A decrease in T(c) of approximately 5 K per coupled pair of adjacent blocks was observed.
Conclusions:
- Multistage intercalation effectively tunes the interaction between CuO(2) sheets in Bi(2)Sr(2)CaCu(2)Ox.
- Interlayer coupling significantly contributes to the superconducting transition temperature in this material.
- The findings provide insights into the mechanism of high-T(c) superconductivity and offer a method for its modulation.
Related Concept Videos
Types Of Superconductors
A superconductor is a substance that offers zero resistance to the electric current when it drops below a critical temperature. Zero resistance is not the only interesting phenomenon as materials reach their transition temperatures. A second effect is the exclusion of magnetic fields. This is known as the Meissner effect. A light, permanent magnet placed over a superconducting sample will levitate in a stable position above the superconductor. High-speed trains that levitate on strong...
Superconductor
A substance that reaches superconductivity, a state in which magnetic fields cannot penetrate, and there is no electrical resistance, is referred to as a superconductor. In 1911, Heike Kamerlingh Onnes of Leiden University, a Dutch physicist, observed a relation between the temperature and the resistance of the element mercury. The mercury sample was then cooled in liquid helium to study the linear dependence of resistance on temperature. It was observed that, as the temperature decreased, the...
Biasing of Metal-Semiconductor Junctions
Biasing metal-semiconductor junctions involves applying a voltage across the junction. Specifically, the metal is connected to a voltage source, while the semiconductor is grounded. This technique is essential for controlling the direction and magnitude of current flow in electronic devices, including diodes, transistors, and photovoltaic cells.
In Schottky junctions, where the semiconductor is n-type, applying a positive voltage to the metal relative to the semiconductor reduces its Fermi...
In Schottky junctions, where the semiconductor is n-type, applying a positive voltage to the metal relative to the semiconductor reduces its Fermi...
Theory of Metallic Conduction
The conduction of free electrons inside a conductor is best described by quantum mechanics. However, a classical model makes predictions close to the results of quantum mechanics. It is called the theory of metallic conduction.
In this theory, Newton's second law of motion is used to determine the acceleration of an electron in the presence of an applied electric field. Then, its velocity is expressed via this acceleration.
An electron moves through the crystal, containing positive ions,...
In this theory, Newton's second law of motion is used to determine the acceleration of an electron in the presence of an applied electric field. Then, its velocity is expressed via this acceleration.
An electron moves through the crystal, containing positive ions,...
MOSFET: Enhancement Mode
Enhancement-mode MOSFETs are pivotal components in electronics, distinguished by their capacity to act as highly efficient switches. They are part of the larger family of metal-oxide Semiconductor Field-Effect Transistors (MOSFETs). They are available in two types: p-channel and n-channel, each tailored to specific polarity operations.
In their basic form, enhancement-mode MOSFETs are typically non-conductive when the gate-source voltage (Vgs) is zero. This default 'off' state means no current...
In their basic form, enhancement-mode MOSFETs are typically non-conductive when the gate-source voltage (Vgs) is zero. This default 'off' state means no current...

