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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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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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Un hueco similar al BCS en el superconductor SmFeAsO0.85F0.1515

T Y Chen1, Z Tesanovic, R H Liu

  • 1Department of Physics and Astronomy, Johns Hopkins University, Baltimore, Maryland 21218, USA.

Nature
|June 6, 2008
PubMed
Resumen

Los investigadores observaron una única brecha superconductora en el SmFeAsO ((0.85) F ((0.15)) utilizando la espectroscopia de Andreev. Este hallazgo, consistente con la teoría de Bardeen-Cooper-Schrieffer (BCS), difiere de los superconductores de óxido de cobre a alta temperatura.

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Área de la Ciencia:

  • Física de la materia condensada Física de la materia condensada
  • Ciencia de los materiales Ciencia de los materiales.
  • La superconductividad es la superconductividad.

Sus antecedentes:

  • La superconductividad de alta temperatura de transición (alta Tc) en los óxidos de cobre se basa en los planos CuO2).
  • Una nueva clase de superconductores de oxypnictide, LaFeAsO{1-x) F{x), carece de planos CuO{2), lo que sugiere mecanismos de emparejamiento alternativos.
  • Las propiedades de la brecha superconductora son cruciales para comprender los mecanismos de emparejamiento.

Objetivo del estudio:

  • Para investigar la brecha superconductora en el superconductor de oxipnictido SmFeAsO(0.85) F(0.15).
  • Para comparar el comportamiento observado de la brecha con la teoría de Bardeen-Cooper-Schrieffer (BCS) y los superconductores de óxido de cobre.
  • Para determinar la naturaleza del parámetro de orden de la brecha (nodal / sin nodo, isotrópico / anisotrópico).

Principales métodos:

  • Se empleó la espectroscopia de Andreev para medir la brecha superconductora.
  • Se estudió la dependencia de temperatura de la brecha.
  • Se calculó la relación 2Delta/kBTc y se comparó con las predicciones teóricas.

Principales resultados:

  • Se observó una única brecha superconductora en SmFeAsO{0.85) F{0.15) con T{c) = 42 K.
  • El valor de la brecha es 2Delta = 13.34 +/- 0.3 meV, lo que da 2Delta/kBTc = 3.68, cerca de la predicción del BCS (3.53).
  • La brecha exhibe dependencia de temperatura consistente con BCS y no tiene nodos y es casi isotrópica, a diferencia de la pseudobrecha en los óxidos de cobre.

Conclusiones:

  • Los resultados sugieren un mecanismo de emparejamiento en SmFeAsO{0.85) F{0.15) que difiere de los de los superconductores de óxido de cobre.
  • La brecha sin nudos y casi isotrópica observada es incompatible con los modelos basados en fluctuaciones antiferromagnéticas o fuertes correlaciones relevantes para cupratos de alto T (c).
  • Este estudio proporciona una visión crítica de la naturaleza fundamental de la superconductividad en los oxypnictides a base de hierro.