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Related Concept Videos

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A superconductor is a substance that offers zero resistance to the electric current when it drops below a critical temperature. Zero resistance is not the only interesting phenomenon as materials reach their transition temperatures. A second effect is the exclusion of magnetic fields. This is known as the Meissner effect. A light, permanent magnet placed over a superconducting sample will levitate in a stable position above the superconductor. High-speed trains that levitate on strong...
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Unconventional Bulk Superconductivity in YFe_{2}Ge_{2} Single Crystals.

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Bulk superconductivity is intrinsic to high purity YFe2Ge2, confirmed by sharp anomalies in new crystals. Heat capacity data suggest disorder-induced in-gap states, paving the way for further YFe2Ge2 research.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Superconductivity Research

Background:

  • YFe2Ge2 exhibits complex electronic properties.
  • Previous studies were limited by crystal purity and disorder.

Purpose of the Study:

  • Establish bulk superconductivity in high-purity YFe2Ge2.
  • Investigate the role of disorder in its superconducting state.
  • Enable advanced multiprobe experiments.

Main Methods:

  • Growth of high-purity YFe2Ge2 single crystals using a novel liquid transport technique.
  • Low-temperature heat capacity measurements.
  • Analysis of residual resistivity and superconducting transition anomalies.

Main Results:

  • Demonstrated intrinsic bulk superconductivity in YFe2Ge2.
  • Observed disorder and field-dependent Sommerfeld coefficient.
  • Achieved a sevenfold reduction in disorder scattering, reaching residual resistivities of approximately 0.45 μΩ cm.
  • Identified evidence for disorder-induced in-gap states.

Conclusions:

  • High-purity YFe2Ge2 exhibits intrinsic bulk superconductivity.
  • The superconducting order parameter is likely sign-changing, influenced by disorder.
  • The new crystal growth method facilitates future investigations into the normal and superconducting states of YFe2Ge2.