Prof. Johannes Bosscha

Superconductivity and ferromagnetism in EuFe2(As1−xPx)2

“…Since the discovery of superconductivity (SC) in mercury 100 years ago, [1] thousands of superconductors have been found in various kind of materials including elements, alloys, inorganic compounds and organic compounds. Nevertheless, SC was shown to be incompatible with magnetism, simply manifested by that fact that all the magnetic elements do not superconduct.…”

Roteiro para a experiência de levitação de um imã repelido por um supercondutor no ensino de Física

“…O fenômeno da supercondutividade foi descoberto [1] em 1911 pelo físico holandês Heike Kammerlingh Onnes, três anos após sua façanha de liquefação do gás hélio que ocorre na temperatura de 4,2 K. Onnes observou que a resistência elétrica de uma amostra de mercúrio desaparecia completamente em temperaturas inferiores a 4 K. Desde sua descoberta, a supercondutividade despertou grande interesse no mundo científico acadêmico e tecnológico. Essa importância pode ser medida pelo número de quatro prêmios Nobel concedidos aos pesquisadores que atuaram brilhantemente na área.…”

One Dimensional Organic Superconductors

“…The fact that the NMR Knight shift (or spin susceptibility) shows no variation below the critical temperature 1 and that the upper critical fields for H//a or H//b' are far above the Pauli limit have been taken as a strong support in favor of a triplet pairing in the quasi-1D organic superconductors. However, this is not so simple at it might be.…”

“…which is already a semiconductor from 300K according to the frequency dependence of the conductivity showing a peak of oscillator strength around 1 …”

“…

The new state of matter (superconductivity) has been discovered somehow unexpectedly in mercury with a critical temperature of T c = 4.15K by Kamerlingh Onnes in 1911 just after he had mastered the liquefaction of helium [1]. However, the phenomenon of superconductivity in particular its T c , is strongly dependent on the material in which it is to be observed.

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