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Related Concept Videos

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A substance that reaches superconductivity, a state in which magnetic fields cannot penetrate, and there is no electrical resistance, is referred to as a superconductor. In 1911, Heike Kamerlingh Onnes of Leiden University, a Dutch physicist, observed a relation between the temperature and the resistance of the element mercury. The mercury sample was then cooled in liquid helium to study the linear dependence of resistance on temperature. It was observed that, as the temperature decreased, the...
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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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Comparison of Two Different Synthesis Methods of Single Crystals of Superconducting Uranium Ditelluride
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Superconductivity and disorder in PrOs(4)Sb(12).

M E McBriarty1, P Kumar, G R Stewart

  • 1Department of Physics, University of Florida, PO Box 118440, Gainesville, FL 32611-8440, USA.

Journal of Physics. Condensed Matter : an Institute of Physics Journal
|August 12, 2011
PubMed
Summary

This study investigates superconductivity in PrOs(4)Sb(12) single crystals, revealing two distinct anomalies. Grinding the crystal suppresses the higher transition, suggesting sensitivity to sample form.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Superconductivity

Background:

  • PrOs(4)Sb(12) is a compelling material for studying complex superconducting phenomena.
  • Understanding the factors influencing its superconducting transitions is crucial for materials science.

Purpose of the Study:

  • To characterize the superconducting properties of a large single crystal of PrOs(4)Sb(12).
  • To investigate the effect of sample morphology (single crystal vs. powder) on superconductivity.
  • To explore the nature of the observed superconducting transitions.

Main Methods:

  • Measurement of specific heat and DC/AC magnetic susceptibility on a single crystal and its powdered form.
  • Analysis of superconducting transition anomalies and their dependence on temperature and sample preparation.
  • Comparison of results with theoretical expectations for Pr(3+) ionic configuration.

Main Results:

  • The single crystal exhibited two distinct superconducting transitions, evidenced by anomalies in specific heat and magnetic susceptibility.
  • Grinding the crystal to a powder suppressed the higher-temperature transition and reduced the magnitude of the lower-temperature transition.
  • Stress annealing partially restored the specific heat anomaly at the lower transition but did not recover the higher transition.

Conclusions:

  • The presence of two superconducting transitions in PrOs(4)Sb(12) single crystals is confirmed, with the higher transition being sensitive to sample morphology.
  • The suppression of superconductivity upon grinding suggests a role for sample surface or strain effects.
  • Further research is needed to fully elucidate the mechanisms behind the two superconducting transitions.