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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...
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Transition metals are defined as those elements that have partially filled d orbitals. As shown in Figure 1, the d-block elements in groups 3–12 are transition elements. The f-block elements, also called inner transition metals (the lanthanides and actinides), also meet this criterion because the d orbital is partially occupied before the f orbitals.
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Demonstrating the Simplicity and In Situ Temperature Monitoring of the Mechanochemical Synthesis of Metal Chalcogenides Suitable for Thermoelectrics
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Strange semimetal dynamics in SrIrO3.

K Sen1, D Fuchs1, R Heid1

  • 1Institut für Quantenmaterialien und -technologien, Karlsruher Institut für Technologie, 76021, Karlsruhe, Germany.

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This study reveals that strontium iridate (SrIrO3) exhibits unusual charge dynamics, behaving like a marginal Fermi liquid. This quantum material

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Area of Science:

  • Quantum materials science
  • Condensed matter physics
  • Solid-state chemistry

Background:

  • Quantum materials exhibit novel states due to electronic correlations, multi-orbital excitations, and spin-orbit coupling.
  • Investigating charge dynamics in materials with varying charge carrier mobilities presents a significant challenge.

Purpose of the Study:

  • To investigate the charge dynamics of semimetallic strontium iridate (SrIrO3) using polarized Raman scattering.
  • To analyze the electronic continuum and extract key parameters like scattering rate and mass enhancement.

Main Methods:

  • Utilized polarized Raman scattering to probe electronic excitations in SrIrO3.
  • Applied a memory function formalism to analyze the frequency-dependent scattering rate and mass enhancement.
  • Compared extracted DC-mobilities and electrical resistivities with existing transport measurements.

Main Results:

  • Observed an electronic continuum in Raman responses for both holes and electrons, extending beyond typical Fermi liquid predictions.
  • Extracted frequency-dependent scattering rates and mass enhancements, confirming marginal Fermi liquid behavior.
  • Determined DC-mobilities and electrical resistivities consistent with transport data.

Conclusions:

  • The charge dynamics of SrIrO3 are well-described by marginal Fermi liquid phenomenology.
  • The scattering rate approaches the Planckian limit, indicating strong electron-electron interactions.
  • Raman scattering is a powerful technique for studying charge dynamics in complex multi-band systems.