Related Experiment Video
Updated: Jul 16, 2026
11:17
Spark Plasma Sintering Apparatus Used for the Formation of Strontium Titanate Bicrystals
Published on: February 9, 2017
Spatiotemporal vortex matter oscillations in Bi2Sr2CaCu2O8+delta crystals
B Kalisky1, M Gitterman, B Ya Shapiro
1Institute for Superconductivity, Department of Physics, Bar-Ilan University, Ramat-Gan, Israel. beena.kalisky@weizmann.ac.il
Physical Review Letters
|March 16, 2007
Summary
Researchers discovered "flux waves," an oscillatory behavior in Bi2Sr2CaCu2O8+delta crystals under magnetic fields, near a vortex phase transition. This phenomenon is explained by coupled dynamic and diffusion equations.
Area of Science:
- Condensed Matter Physics
- Materials Science
- Superconductivity
Background:
- Bi2Sr2CaCu2O8+delta (BSCCO) is a high-temperature superconductor.
- Vortex matter in superconductors exhibits complex phase transitions.
- Understanding magnetic induction dynamics is crucial for superconducting applications.
Purpose of the Study:
- To investigate the oscillatory behavior of magnetic induction in BSCCO crystals.
- To identify the conditions and theoretical basis for the observed "flux waves" phenomenon.
- To analyze the relationship between flux waves and the vortex phase transition.
Main Methods:
- Experimental observation of magnetic induction in BSCCO crystals under a steady magnetic field.
- Theoretical modeling using coupled Landau-Khalatnikov and diffusion equations.
- Linear stability analysis of the theoretical model.
Main Results:
- Observed spatial and temporal oscillations in magnetic induction, termed "flux waves".
- Flux waves occur near the vortex order-disorder phase transition under specific temperature and induction gradients.
- Theoretical analysis accurately predicted the oscillatory instability, including its period and wavelength.
Conclusions:
- The "flux waves" phenomenon in BSCCO crystals is a novel observation linked to vortex dynamics.
- A theoretical framework combining order parameter dynamics and magnetic induction diffusion explains the observed oscillations.
- The findings provide insights into the complex behavior of superconductors near phase transitions.
Related Concept Videos
01:27Symmetry Elements in a Crystal
Crystal symmetry operations are isometric transformations that map objects onto indistinguishable copies while preserving distances, angles, and volumes. The simplest symmetry operation is translation, which shifts the entire infinite crystal lattice parallelly by a translation vector.Crystallographic rotations involve rotations by an angle of 2π/n around an axis without changing the positions of points on the axis. It is called the rotational axis of the symmetry, denoted by n. The combination...
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...
02:46Crystal Field Theory - Tetrahedral and Square Planar Complexes
Tetrahedral Complexes
Crystal field theory (CFT) is applicable to molecules in geometries other than octahedral. In octahedral complexes, the lobes of the dx2−y2 and dz2 orbitals point directly at the ligands. For tetrahedral complexes, the d orbitals remain in place, but with only four ligands located between the axes. None of the orbitals points directly at the tetrahedral ligands. However, the dx2−y2 and dz2 orbitals (along the Cartesian axes) overlap with the ligands less than the dxy,...
Crystal field theory (CFT) is applicable to molecules in geometries other than octahedral. In octahedral complexes, the lobes of the dx2−y2 and dz2 orbitals point directly at the ligands. For tetrahedral complexes, the d orbitals remain in place, but with only four ligands located between the axes. None of the orbitals points directly at the tetrahedral ligands. However, the dx2−y2 and dz2 orbitals (along the Cartesian axes) overlap with the ligands less than the dxy,...
01:31Oscillations In An LC Circuit
An idealized LC circuit of zero resistance can oscillate without any source of emf by shifting the energy stored in the circuit between the electric and magnetic fields. In such an LC circuit, if the capacitor contains a charge q before the switch is closed, then all the energy of the circuit is initially stored in the electric field of the capacitor. This energy is given by
01:04Oscillations about an Equilibrium Position
Stability is an important concept in oscillation. If an equilibrium point is stable, a slight disturbance of an object that is initially at the stable equilibrium point will cause the object to oscillate around that point. For an unstable equilibrium point, if the object is disturbed slightly, it will not return to the equilibrium point. There are three conditions for equilibrium points—stable, unstable, and half-stable. A half-stable equilibrium point is also unstable, but is named so because...
01:26Imperfections in Crystal Structure: Stoichiometric Point Defects
Schottky defects arise when some lattice points in a crystal, such as those in NaCl, remain unoccupied, creating lattice vacancies without disturbing the overall electrical neutrality of the crystal. This defect is common in ionic crystals where the positive and negative ions are similar in size, as seen in sodium chloride and cesium chloride. The presence of Schottky defects enables the crystal to conduct electricity to a small extent through an ionic mechanism. Electric fields cause nearby...