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Books > Professional & Technical > Electronics & communications engineering > Electronics engineering > Electronic devices & materials > Semi-conductors & super-conductors
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Electromagnetic Absorption in the Copper Oxide Superconductors (Hardcover, 2002 ed.)
Loot Price: R3,146
Discovery Miles 31 460
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Electromagnetic Absorption in the Copper Oxide Superconductors (Hardcover, 2002 ed.)
Series: Selected Topics in Superconductivity
Expected to ship within 10 - 15 working days
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In 1987 a major breakthrough occurred in materials science. A new
family of materials was discovered that became superconducting
above the temperature at which nitrogen gas liquifies, namely, 77 K
or -196 DegreesC. Within months of the discovery, a wide variety of
experimental techniques were brought to bear in order to measure
the properties of these materials and to gain an understanding of
why they superconduct at such high temperatures. Among the
techniques used were electromagnetic absorption in both the normal
and the superconducting states. The measurements enabled the
determination of a wide variety of properties, and in some
instances led to the observation of new effects not seen by other
measu- ments, such as the existence of weak-link microwave
absorption at low dc magnetic fields. The number of different
properties and the degree of detail that can be obtained from
magnetic field- and temperature-dependent studies of
electromagnetic abso- tion are not widely appreciated. For example,
these measurements can provide information on the band gap,
critical fields, the H-T irreversibility line, the amount of
trapped flux, and even information about the symmetry of the wave
function of the Cooper pairs. It is possible to use low dc magnetic
field-induced absorption of microwaves with derivative detection to
verify the presence of superconductivity in a matter of minutes,
and the measurements are often more straightforward than others.
For example, they do not require the physical contact with the
sample that is necessary when using four-probe resistivity to
detect superconductivity.
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