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Related Concept Videos

Superconductor01:24

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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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Materials like iron, nickel, and cobalt consist of magnetic domains, within which the magnetic dipoles are arranged parallel to each other. The magnetic dipoles are rigidly aligned in the same direction within a domain by quantum mechanical coupling among the atoms. This coupling is so strong that even thermal agitation at room temperature cannot break it. The result is that each domain has a net dipole moment. However, some materials have weaker coupling, and are ferromagnetic at lower...
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Intrinsic semiconductors are highly pure materials with no impurities. At absolute zero, these semiconductors behave as perfect insulators because all the valence electrons are bound, and the conduction band is empty, disallowing electrical conduction. The Fermi level is a concept used to describe the probability of occupancy of energy levels by electrons at thermal equilibrium. In intrinsic semiconductors, the Fermi level is positioned at the midpoint of the energy gap at absolute zero. When...
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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.
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Related Experiment Video

Updated: May 30, 2026

Visualizing Uniaxial-strain Manipulation of Antiferromagnetic Domains in Fe1+YTe Using a Spin-polarized Scanning Tunneling Microscope
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Superconductivity induced by Ni doping in SmFe(1-x)Ni(x)AsO.

Y K Li1, X Lin, T Zhou

  • 1Department of Physics, Zhejiang University, Hangzhou 310027, People's Republic of China.

Journal of Physics. Condensed Matter : an Institute of Physics Journal
|August 11, 2011
PubMed
Summary

Superconductivity emerges in Ni-doped SmFeAsO as spin-density waves are suppressed. The study reveals a correlation between enhanced thermopower and superconductivity, with a peak critical temperature of 10.8 K.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Solid-State Chemistry

Background:

  • SmFeAsO is a parent compound exhibiting spin-density wave (SDW) order.
  • Doping is a common strategy to suppress SDW and induce superconductivity in iron-based superconductors.

Purpose of the Study:

  • To investigate the effect of Ni doping on the electronic properties of SmFeAsO.
  • To explore the emergence of superconductivity and its correlation with charge carrier behavior.

Main Methods:

  • Synthesis of SmFe(1-x)Ni(x)AsO samples with varying Ni content (x).
  • Measurements of electrical resistivity, magnetic susceptibility, and thermopower.
  • Analysis of the suppression of spin-density wave (SDW) order and the emergence of superconductivity.

Main Results:

  • Superconductivity observed for Ni content x ≥ 0.04, with a maximum critical temperature (T(c)) of 10.8 K at x = 0.06.
  • Spin-density wave (SDW) order is suppressed by Ni doping.
  • Electron-type charge carriers dominate, and thermopower shows anomalous enhancement correlated with superconductivity.
  • Upper critical field (H(c2)(0)) estimated at 40 T for the optimally doped sample.

Conclusions:

  • Ni doping effectively suppresses SDW order and induces superconductivity in SmFeAsO.
  • Anomalous thermopower behavior is linked to the superconducting properties.
  • A dome-like phase diagram of T(c)(x) is established, highlighting the interplay between doping, SDW, and superconductivity.