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Related Concept Videos

Fermi Level01:18

Fermi Level

The Fermi-Dirac function is represented by an S-shaped curve indicating the probability of an energy state being occupied by an electron at a given temperature. The Fermi level is the energy level at which there is a fifty percent chance of finding an electron, and it is positioned between the lower-energy valence band and the higher-energy conduction band.
At absolute zero temperature, electrons fill all energy states up to the Fermi level, leaving upper states empty. As the temperature rises,...
Fermi Level Dynamics01:12

Fermi Level Dynamics

The vacuum level denotes the energy threshold required for an electron to escape from a material surface. It is usually positioned above the conduction band of a semiconductor and acts as a benchmark for comparing electron energies within various materials.
Electron affinity in semiconductors refers to the energy gap between the minimum of its conduction band and the vacuum level and it is a critical parameter in determining how easily a semiconductor can accept additional electrons.
The work...
Atomic Spectroscopy: Effects of Temperature01:27

Atomic Spectroscopy: Effects of Temperature

Atomization, converting samples into gas-phase atoms and ions, is essential for atomic spectroscopy. The flame temperature required for atomization affects the efficiency of the atomic spectroscopic methods by increasing the atomization efficiency and the relative population of the excited and ground states.
At thermal equilibrium, the relative populations of excited and ground state atoms can be estimated using the Maxwell–Boltzmann distribution. For example, an increase in temperature from...
Atomic Nuclei: Nuclear Spin State Population Distribution01:14

Atomic Nuclei: Nuclear Spin State Population Distribution

Near absolute zero temperatures, in the presence of a magnetic field, the majority of nuclei prefer the lower energy spin-up state to the higher energy spin-down state. As temperatures increase, the energy from thermal collisions distributes the spins more equally between the two states. The Boltzmann distribution equation gives the ratio of the number of spins predicted in the spin −½ (N−) and spin +½ (N+) states.
Phase Transitions: Melting and Freezing02:39

Phase Transitions: Melting and Freezing

Heating a crystalline solid increases the average energy of its atoms, molecules, or ions, and the solid gets hotter. At some point, the added energy becomes large enough to partially overcome the forces holding the molecules or ions of the solid in their fixed positions, and the solid begins the process of transitioning to the liquid state or melting. At this point, the temperature of the solid stops rising, despite the continual input of heat, and it remains constant until all of the solid is...
Theory of Metallic Conduction01:17

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,...

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Angle-resolved Photoemission Spectroscopy At Ultra-low Temperatures
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Published on: October 9, 2012

Temperature-dependent Fermi surface evolution in heavy fermion CeIrIn5.

Hong Chul Choi1, B I Min, J H Shim

  • 1Department of Physics, Pohang University of Science and Technology, Pohang 790-784, Korea.

Physical Review Letters
|February 7, 2012
PubMed
Summary
This summary is machine-generated.

We theoretically investigated heavy fermion Fermi surface evolution in CeIrIn5. Cooling reveals logarithmic scaling in quantum oscillations and cyclotron masses, indicating significant topological changes and a resistivity coherence peak.

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Area of Science:

  • Condensed Matter Physics
  • Quantum Materials Science

Background:

  • Heavy fermion systems exhibit complex electronic behaviors due to localized f-electrons interacting with conduction electrons.
  • Understanding the temperature-dependent evolution of the Fermi surface (FS) is crucial for characterizing these materials.

Purpose of the Study:

  • To theoretically investigate the temperature evolution of the heavy fermion Fermi surface (FS) in CeIrIn5.
  • To elucidate the underlying mechanisms driving changes in FS topology and resistivity.

Main Methods:

  • First-principles dynamical mean-field theory (DMFT) combined with density functional theory (DFT).
  • Analysis of quantum oscillation frequencies and cyclotron masses as a function of temperature (T).

Main Results:

  • Observed logarithmic scaling of quantum oscillation frequencies and cyclotron masses with characteristic temperatures T0=130 K and 50 K, respectively.
  • Identified FS enlargement and topological changes occurring between 10-50 K.
  • Correlated the resistivity coherence peak at ~50 K with competing electronic binding and coherence formation processes.

Conclusions:

  • The study provides a theoretical framework for understanding the temperature-driven evolution of heavy fermion Fermi surfaces.
  • Results highlight the interplay between localized f-electrons and conduction electrons in shaping electronic properties of CeIrIn5.