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Insensitive Nuclei Enhanced by Polarization Transfer (INEPT) is an advanced Nuclear Magnetic Resonance (NMR) technique specifically designed to detect and enhance the signals of low-abundance nuclei, such as carbon-13 and nitrogen-15, in small molecules. The fundamental principle behind INEPT is the transfer of polarization from a more abundant and highly polarizable nucleus, typically hydrogen-1, to the low-abundance nucleus of interest. This process effectively boosts the NMR signal of the...
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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,...
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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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Related Experiment Video

Updated: Jun 29, 2025

Visualizing Uniaxial-strain Manipulation of Antiferromagnetic Domains in Fe1+YTe Using a Spin-polarized Scanning Tunneling Microscope
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Enhanced weak superconductivity in trigonalγ-PtBi2.

J Zabala1, V F Correa1, F J Castro1

  • 1Centro Atómico Bariloche and Instituto Balseiro, CNEA, CONICET and U. N. de Cuyo, 8400 San Carlos de Bariloche, Argentina.

Journal of Physics. Condensed Matter : an Institute of Physics Journal
|March 27, 2024
PubMed
Summary

Superconductivity was observed in trigonal γ-PtBi2 at 1.1K, exhibiting high critical magnetic fields but low critical current density. These findings suggest an inhomogeneous superconducting state in this material.

Keywords:
electrical transportsuperconductivitytopological matter

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Superconductivity

Background:

  • Superconducting materials are crucial for energy-efficient technologies.
  • Investigating novel materials with unique superconducting properties is essential for advancing scientific understanding and technological applications.

Purpose of the Study:

  • To investigate the superconducting properties of trigonal γ-PtBi2 single crystals.
  • To determine the critical temperature (Tc), critical magnetic field (Hc2), and critical current density (Jc) of γ-PtBi2.
  • To explore the anisotropy and homogeneity of superconductivity in γ-PtBi2.

Main Methods:

  • Electrical resistivity measurements were performed on high-quality single crystals of trigonal γ-PtBi2.
  • Critical magnetic field (Hc2) and critical current density (Jc) were measured as a function of temperature and magnetic field.
  • Magnetization experiments (field-cooling/zero-field-cooling) were conducted to assess superconducting homogeneity.

Main Results:

  • Superconductivity was observed at a critical temperature (Tc) of 1.1K.
  • An enhanced critical magnetic field (μ0Hc2(0)) exceeding 1.5 Tesla and a low critical current density (Jc(0)) of approximately 40 A cm⁻² were recorded.
  • Weak anisotropy (Γ < 1) and a broadening/asymmetry of the superconducting transition under magnetic field were observed, indicating an inhomogeneous superconducting state.

Conclusions:

  • Trigonal γ-PtBi2 exhibits superconductivity with notable critical field properties at ambient pressure.
  • The observed low critical current density and transition broadening suggest an inhomogeneous superconducting state.
  • Further research is needed to understand the underlying mechanisms and potential applications of this material.