Related Experiment Video
Updated: Mar 23, 2026
08:55
Methods of Ex Situ and In Situ Investigations of Structural Transformations: The Case of Crystallization of Metallic Glasses
Published on: June 7, 2018
9.0K
Hall effect in quantum critical charge-cluster glass.
Jie Wu1, Anthony T Bollinger1, Yujie Sun2
1Condensed Matter Physics and Materials Science Division, Brookhaven National Laboratory, Upton, NY 11973-5000;
Summary
Quantum critical fluctuations in La2-xSrxCuO4 (LSCO) were observed via Hall resistance anomalies. These fluctuations compete with superconductivity, highlighting a complex interplay near the quantum critical point.
Area of Science:
- Condensed Matter Physics
- Materials Science
Background:
- Cuprates exhibit a quantum phase transition from insulating to d-wave superconducting states upon doping.
- The precise nature of this transition and the insulating state remains a subject of intense scientific debate.
Purpose of the Study:
- Investigate the Hall effect in La2-xSrxCuO4 (LSCO) near the quantum critical point (x ~ 0.06).
- Characterize quantum critical behavior and its relationship with superconductivity.
Main Methods:
- Studied Hall resistance in LSCO samples doped near the quantum critical point.
- Utilized a combinatorial LSCO library with extremely fine Sr content steps (Δx ~ 0.00008) to analyze doping dependence.
- Applied magnetic fields to suppress superconductivity and observe its effect on quantum charge fluctuations.
Main Results:
- Observed dramatic fluctuations in Hall resistance below ~1.5 K, increasing with further cooling, indicative of quantum critical behavior.
- Found that quantum charge fluctuations diminish with the emergence of superconductivity.
- Demonstrated that these fluctuations can be restored by suppressing superconductivity with a magnetic field.
Conclusions:
- Quantum charge fluctuations and superconductivity in LSCO exhibit a competitive relationship for the ground state.
- The findings provide critical insights into the complex phase diagram of cuprate superconductors near their quantum critical point.
Related Concept Videos
02:54Trends in Lattice Energy: Ion Size and Charge
27.2K
An ionic compound is stable because of the electrostatic attraction between its positive and negative ions. The lattice energy of a compound is a measure of the strength of this attraction. The lattice energy (ΔHlattice) of an ionic compound is defined as the energy required to separate one mole of the solid into its component gaseous ions. For the ionic solid sodium chloride, the lattice energy is the enthalpy change of the process:
27.2K
02:58Crystal Field Theory - Octahedral Complexes
31.6K
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...
31.6K
01:30The Hall Effect
5.0K
Edwin H. Hall, in the year 1879, devised an experiment that could be used to identify the polarity of the predominant charge carriers in a conducting material. From a historical perspective, this experiment was the first to demonstrate that the charge carriers in most metals are negative.
5.0K
01:26Imperfections in Crystal Structure: Stoichiometric Point Defects
62
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...
62
01:28Debye–Huckel–Onsager Conductance Equation
129
The Debye-Hückel-Onsager equation is a cornerstone of physical chemistry, providing a method to determine the molar conductance (Λm) and molar conductance at infinite dilution (Λ°m) for uni-univalent electrolytes.Uni-univalent electrolytes are electrolytes that dissociate in solution to produce one cation with a +1 charge and one anion with a –1 charge per formula unit.This equation addresses two crucial phenomena: the asymmetry effect and the electrophoretic effect.
129
01:30The Electrical Double Layer
116
In the region where two bulk phases meet, an intricate electric charge distribution arises due to charge transfer, ion adsorption, molecular orientation, and charge distortion. This complex distribution is commonly referred to as the electrical double layer.When a solid electrode interfaces with ions in an electrolyte solution, the speed of electron transfer dictates the rates of oxidation and reduction. The electrode acquires a charge through the escape of atoms into the solution as cations or...
116