scispace - formally typeset
Search or ask a question
Journal ArticleDOI

Enhancement and degradation of Tc in Bi-HTSC due to Li3+ irradiations

TL;DR: In this article, the superconducting critical temperature of Li-irradiation of O-rich Bi(2.2.1.2) with excess oxygen and O-content less than the optimum was investigated.
Abstract: Radiation damage in Bi2Sr2CaCu2O8+δ or Bi(2 2 1 2) by 55 MeV Li3+-beam has been studied from electrical resistivity and X-ray diffraction characterizations. This irradiation increases electrical resistivity and broadens X-ray diffraction lines by generating defects in all samples. But superconducting critical temperature, Tc, is seen to increase for Bi(2 2 1 2) with excess oxygen and decrease for Bi(2 2 1 2) with O-content less than the optimum, that gives maximum Tc. This increase of the superconducting critical temperature on Li-irradiation of O-rich Bi(2 2 1 2) as well as the decrease for low-O Bi(2 2 1 2) is due to O-displacement. This is in agreement with our earlier He-irradiation results.
Citations
More filters
Journal ArticleDOI
27 Jan 2020
TL;DR: Sahu et al. as discussed by the authors proposed a radiation enhancement of superconducting critical temperature of Fe-based HTSCs, which can improve the performance of the HTSC.
Abstract: International Journal of Advanced Science and Engineering www.mahendrapublications.com Radiation Enhancement of Superconducting Critical Temperature of Fe-based HTSCs Kriti R Sahu1, Ashish K Mishra2, D. Sanyal3, Thomas Wolf4, A. Banerjee2, V. Ganesan2 and Udayan De1,* 1Department of Physics, Egra S. S. B. College, Egra, Purba Medinipur, West Bengal; India 721429 2UGC-DAE CSR, Indore-452001, Madhya Pradhesh India 3Variable Energy Cyclotron Centre, 1/AF Bidhannagar, Kolkata 700064, India 4Karlsruhe Institute of Technology, Karlsruhe D-76021, Germany

1 citations

References
More filters
Journal ArticleDOI
TL;DR: In this paper, the static magnetic susceptibility of hole-doped oxide superconductors was studied as a function of oxygen content over the temperature range 2-900 K, and a correlation was observed between the magnitude of T c ( y ) and the temperature dependence of the normal-state magnetic susceptibility.
Abstract: The static magnetic susceptibility of Bi 2 Sr 2 CaCu 2 O 8+ y and Tl 2 Ba 2 CuO 6+ y is studied as a function of oxygen content y over the temperature range 2–900 K. With increasing oxygen (hole) content the superconducting transition temperature T c ( y ) passes through a maximum for the Bi-compound and falls monotonically for the Tl-system, reaching a maximal value of c ≅92 K in both systems. As the oxygen content is varied, a correlation is observed between the magnitude of T c ( y ) and the temperature dependence of the normal-state magnetic susceptibility. The fact that this same correlation can also be seen in the published data on La 2- x Sr x CuO 4 and YBa 2 Cu 2 O 6+ y implies that it may be a universal property of hole-doped oxide superconductors.

82 citations

Journal ArticleDOI
TL;DR: In this article, Tl-based superconducting copper oxides were irradiated at 140 K by 3.6 GeV Xe ions and the resistance measured in situ as a function of the fluence.
Abstract: Tl-based superconducting copper oxides Tl 2 Ba 2 CaCu 2 O 8 , TlBa 2 Ca 2 Cu 3 O 9 and Tl 2 Ba 2 Ca 2 Cu 3 O 10 were irradiated at 140 K by 3.6 GeV Xe ions and the resistance measured in situ as a function of the fluence. The results confirm that electronic stopping of GeV heavy ions plays a major role in the defect creation mechanism. Critical current densities were obtained from magnetization measurements on samples irradiated by 5.8 GeV Xe ions at fluences up to 2x10 12 cm -2 and magnetic field orientations parallel and normal to the heavy ions tracks. Large enhancements of flux pinning and J c are observed, in particular at low fluences, without significant change of the T c 's.

36 citations

Journal ArticleDOI
TL;DR: A substantial increase in the transition temperature has been noted in Bi 2 Sr 2 CaCu 2 O x superconductor after irradiation with 20 MeV alpha particles as mentioned in this paper, probably due to oxygen removal from an oxygen rich superconducting phase.

15 citations

Journal ArticleDOI
TL;DR: Positron annihilation lifetime (PAL) measurements on well-characterized pellets of Bi-2212, (Bi,Pb)-2212 and Bi-Pb-2223 superconductors indicate the presence of a very long (around 1500 ps) third lifetime.

14 citations