Magnetic relaxation and irreversibility in a superconductingTl2Ba2

Magnetic relaxation in high-temperature superconductors

“…As we already mentioned in the Introduction, magnetic relaxation has been studied in all hightemperature-superconductor families. These include LaSrCaCuO (Mota et al, , 1988, YBaCuO (Hor et al, 1987;Hagen et al, 1988;Tuominen et al, 1988;Wong et al, 1988;Yeshurun and Malozemoff, 1988;Yeshurun et al, 1988a), BiSrCaCuO (Biggs et al, 1989;Lessure et al, 1989;Safar et al, 1989;Yeshurun, Malozemoff, Worthington et al, 1989;Shi, Xu, Umezawa, and Fox, 1990) TlBaCaCuO (McHenry, Maley, Venturini, and Ginley, 1989;Chan and Liou, 1992;Schilling et al, 1992), HgBaCaCuO (Kim and Kim, 1996), the electrondoped superconductor NdCeBaCuO (Fabrega et al, 1992;Yoo and McCallum, 1993), and even the noncopper-based superconductor BaKBiO (McHenry, Maley, Kwei, and Thompson, 1989). All of these studies-as well as hundreds of other publications not listed here-reveal large relaxation rates dM/d lnt.…”

Giant suppression of flux-flow resistivity in heavy-ion irradiatedTl2Ba2Budhani1, Suenaga2, Liou3 1992Phys. Rev. Lett.Self Cite1491450View full textAdd to dashboardCite

“…The irreversibility temperature has been deduced from the position of the ;^" peak in the mutual-inductance data taken at 100 kHz with the external dc field Hllc. The inset of the figure shows quadrature components of the pickup voltage at 4.4 T. The strongly depressed, L-shaped, H[rr(T) of the unirradiated sample is a characteristic of the double Tl-O or Bi-O layer containing highly anisotropic cuprates [10,18,19]. The irreversibility line shifts to higher temperatures after irradiation.…”

“…These properties, together with its tendency for a platelet-type growth in the basal plane in which current transport is not impeded by grain boundaries [9], make it a promising cuprate for large-scale conductor applications. However, these favorable characteristics are masked by the large reversible region in the H-T plane [10], which does not allow usable supercurrent transport in the temperature and field regimes of interest.…”

Study of the Irreversibility Line of GdBa 2Cu 3 O 7 − δ Added with Nanosized Ferrite CoFe 2 O 4

“…This is related to the degree of anisotropy of the system [42]. The fitting shows a power law dependence over all ranges of data but with different exponents, indicating the difference between the behavior at low and high field regions.…”