Question

A crystal study of the 128k superconductor tl2ba2ca2cu3o10: synthesis and anisotropic magnetic properties

Answer 1

Answer:

Tl-2223 (Tl2Ba2Ca2Cu3O10) millimeter-size (in the ab-plane) crystals, exhibiting sharp transitions with Tc's ranging from 125 K to 128 K, have been grown for the first time. The combination of ED, EDX and XRD techniques has allowed us to select large crystals with the composition “Tl1.95Ba2Ca2.05Cu3”, i.e. close to the nominal composition. An annealing in a reducing atmosphere at low temperature decreases Tc from 128 K to 116 K with a broadening of the transition; Tc is partially restored (124 K) by annealing under oxygen flow. Magnetic measurements have been carried out in both geometries, H∥ab-plane and H∥c with 0 ⩽ H ⩽ 5.5 T at different temperatures. The values of Jc in the ab-plane and the irreversibility line position for H∥c have been deduced from the magnetization loops. λab(0) = 2400 Å and λc(0) = 11 000 Å have been extracted from the reversible part of these isothermal M (H) curves, leading to an anisotropy γ=(mc/mab)12=4.6. This latter value demonstrates that Tl2Ba 2Ca2Cu3O10 is less anisotropic than the n = 1 and n = 2 members of the thallium series Tl2Ba2Can−1CunO2n+4.

Tl-2223 (Tl2Ba2Ca2Cu3O10) millimeter-size (in the ab-plane) crystals, exhibiting sharp transitions with Tc's ranging from 125 K to 128 K, have been grown for the first time. The combination of ED, EDX and XRD techniques has allowed us to select large crystals with the composition “Tl1.95Ba2Ca2.05Cu3”, i.e. close to the nominal composition. An annealing in a reducing atmosphere at low temperature decreases Tc from 128 K to 116 K with a broadening of the transition; Tc is partially restored (124 K) by annealing under oxygen flow. Magnetic measurements have been carried out in both geometries, H∥ab-plane and H∥c with 0 ⩽ H ⩽ 5.5 T at different temperatures. The values of Jc in the ab-plane and the irreversibility line position for H∥c have been deduced from the magnetization loops. λab(0) = 2400 Å and λc(0) = 11 000 Å have been extracted from the reversible part of these isothermal M (H) curves, leading to an anisotropy γ=(mc/mab)12=4.6. This latter value demonstrates that Tl2Ba 2Ca2Cu3O10 is less anisotropic than the n = 1 and n = 2 members of the thallium series Tl2Ba2Can−1CunO2n+4.Explanation:

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Answer 2

Answer:

Superconductivity is a set of physical properties observed in certain materials where electrical resistance vanishes and magnetic flux fields are expelled from the material. Any material exhibiting these properties is a superconductor.