Related Experiment Video
Updated: Jul 3, 2026
06:53
Scanning SQUID Study of Vortex Manipulation by Local Contact
Published on: February 1, 2017
Ordered, disordered, and coexistent stable vortex lattices in NbSe2 single crystals
G Pasquini1, D Pérez Daroca, C Chiliotte
1Departamento de Física, FCEyN, Universidad de Buenos Aires, Pabellon 1, Ciudad Universitaria, Buenos Aires, Argentina. pasquini@df.uba.ar
Physical Review Letters
|July 23, 2008
Summary
The peak effect in type II superconductors involves vortex lattice (VL) order-disorder transitions. This study reveals distinct VL configurations, including ordered, disordered, and intermediate states, clarifying the physics of the peak effect.
Area of Science:
- Condensed Matter Physics
- Superconductivity Research
- Materials Science
Background:
- The peak effect (PE) in type II superconductors is linked to vortex lattice (VL) order-disorder transitions, though its physics is debated.
- Metastabilities often obscure stationary VL configurations, complicating PE studies.
Purpose of the Study:
- To investigate the underlying physics of the peak effect in type II superconductors.
- To access and examine stationary vortex lattice configurations by avoiding reorganization.
Main Methods:
- Utilized shaking and thermal protocols on NbSe2 single crystals.
- Employed linear ac susceptibility measurements to probe VL configurations without inducing reorganization.
Main Results:
- Identified three distinct temperature-dependent regions for VL configurations.
- Observed maximally ordered VL for T
- Discovered intermediate, temperature-dependent disorder in the T1
Conclusions:
- The peak effect region likely involves a coexistence of ordered and disordered vortex lattice states.
- Provides a clearer understanding of the vortex lattice behavior associated with the peak effect in superconductors.
Related Concept Videos
01:27Lattice Energies of Ionic Crystals
Lattice energy represents the energy released when gaseous cations and anions combine to form an ionic solid, reflecting the strength of electrostatic interactions within the crystal. This process is fundamentally governed by Coulombic attraction between oppositely charged ions, where the potential energy varies inversely with the interionic distance and directly with the product of ionic charges. As ions approach one another, the electrostatic energy becomes increasingly negative, indicating a...
01:12Bewley Lattice Diagram
The Bewley lattice diagram, developed by L. V. Bewley, effectively organizes the reflections occurring during transmission-line transients. It visually represents how voltage waves propagate and reflect within a transmission line, making it easier to understand the complex interactions that occur.
04:01VSEPR Theory and the Effect of Lone Pairs
Effect of Lone Pairs of Electrons on Molecule Geometry
02:58Crystal Field Theory - Octahedral Complexes
Crystal Field Theory
To explain the observed behavior of transition metal complexes (such as colors), a model involving electrostatic interactions between the electrons from the ligands and the electrons in the unhybridized d orbitals of the central metal atom has been developed. This electrostatic model is crystal field theory (CFT). It helps to understand, interpret, and predict the colors, magnetic behavior, and some structures of coordination compounds of transition metals.
CFT focuses on...
To explain the observed behavior of transition metal complexes (such as colors), a model involving electrostatic interactions between the electrons from the ligands and the electrons in the unhybridized d orbitals of the central metal atom has been developed. This electrostatic model is crystal field theory (CFT). It helps to understand, interpret, and predict the colors, magnetic behavior, and some structures of coordination compounds of transition metals.
CFT focuses on...
02:33Lattice Centering and Coordination Number
The structure of a crystalline solid, whether a metal or not, is best described by considering its simplest repeating unit, which is referred to as its unit cell. The unit cell consists of lattice points that represent the locations of atoms or ions. The entire structure then consists of this unit cell repeating in three dimensions. The three different types of unit cells present in the cubic lattice are illustrated in Figure 1.
Types of Unit Cells
Imagine taking a large number of identical...
Types of Unit Cells
Imagine taking a large number of identical...
02:42Valence Bond Theory
Coordination compounds and complexes exhibit different colors, geometries, and magnetic behavior, depending on the metal atom/ion and ligands from which they are composed. In an attempt to explain the bonding and structure of coordination complexes, Linus Pauling proposed the valence bond theory, or VBT, using the concepts of hybridization and the overlapping of the atomic orbitals. According to VBT, the central metal atom or ion (Lewis acid) hybridizes to provide empty orbitals of suitable...