Related Experiment Video
Updated: Jun 23, 2025
09:06
Visualizing Uniaxial-strain Manipulation of Antiferromagnetic Domains in Fe1+YTe Using a Spin-polarized Scanning Tunneling Microscope
Published on: March 24, 2019
8.1K
High-Temperature Anomalous Metal States in Iron-Based Interface Superconductors
Yanan Li1,2, Haiwen Liu3, Haoran Ji1
1International Center for Quantum Materials, School of Physics, Peking University, Beijing 100871, China.
Physical Review Letters
|June 15, 2024
Summary
Researchers investigated anomalous metal states in iron selenide (FeSe) films. Modulating these states, crucial for superconductivity, offers insights into two-dimensional bosonic systems.
Area of Science:
- Condensed matter physics
- Materials science
- Superconductivity
Background:
- The anomalous metal state in condensed matter physics remains a significant puzzle.
- Understanding its nature is key to advancing high-temperature superconductivity.
Purpose of the Study:
- To systematically investigate and modulate anomalous metal states in iron selenide (FeSe) films.
- To explore the influence of nanostructure on these states and their underlying mechanisms.
Main Methods:
- Fabrication of pristine FeSe films on strontium titanate (SrTiO3) substrates.
- Creation of FeSe films with nanohole arrays for comparative analysis.
- Experimental investigation of anomalous metal states under varying conditions.
Main Results:
- Anomalous metal states persisted up to 20 K in pristine FeSe films, a notably high temperature.
- Nanohole arrays significantly reduced the characteristic temperature of the anomalous metal state.
- The anomalous metal states were attributed to quantum vortex tunneling modulated by Ohmic dissipation.
Conclusions:
- The study elucidates the origin of anomalous metal states in 2D bosonic systems.
- Quantum vortex tunneling and Ohmic dissipation are identified as key mechanisms.
- This research provides a framework for modulating these states in novel electronic materials.
Related Concept Videos
01:28Types Of Superconductors
972
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...
972
01:24Superconductor
1.1K
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...
1.1K
01:31Ferromagnetism
2.4K
Materials like iron, nickel, and cobalt consist of magnetic domains, within which the magnetic dipoles are arranged parallel to each other. The magnetic dipoles are rigidly aligned in the same direction within a domain by quantum mechanical coupling among the atoms. This coupling is so strong that even thermal agitation at room temperature cannot break it. The result is that each domain has a net dipole moment. However, some materials have weaker coupling, and are ferromagnetic at lower...
2.4K
02:32Bonding in Metals
47.1K
Metallic bonds are formed between two metal atoms. A simplified model to describe metallic bonding has been developed by Paul Drüde called the “Electron Sea Model”.
47.1K
01:28Magnetostatic Boundary Conditions
908
An electric field suffers a discontinuity at a surface charge. Similarly, a magnetic field is discontinuous at a surface current. The perpendicular component of a magnetic field is continuous across the interface of two magnetic mediums. In contrast, its parallel component, perpendicular to the current, is discontinuous by the amount equal to the product of the vacuum permeability and the surface current. Like the scalar potential in electrostatics, the vector potential is also continuous...
908
01:24Metal-Semiconductor Junctions
333
The contact of metal and semiconductor can lead to the formation of a junction with either Schottky or Ohmic behavior.
Schottky Barriers
Schottky barriers arise when a metal with a work function (Φm) contacts a semiconductor with a different work function (Φs). Initially, electrons transfer until the Fermi levels of the metal and semiconductor align at equilibrium. For instance, if Φm > Φs, the semiconductor Fermi level is higher than the metal's before contact. The...
Schottky Barriers
Schottky barriers arise when a metal with a work function (Φm) contacts a semiconductor with a different work function (Φs). Initially, electrons transfer until the Fermi levels of the metal and semiconductor align at equilibrium. For instance, if Φm > Φs, the semiconductor Fermi level is higher than the metal's before contact. The...
333