Gamma radiation resistance of the high <i>T</i>
                  <i>c</i> superconductor YBa2Cu3O7−δ

Bohandy, J.; Suter, Joseph J.; Kim, B. F.; Moorjani, K.; Adrian, Frank J.

doi:10.1063/1.98954

Cited by 62 publications

(11 citation statements)

References 12 publications

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“…Recently, it has been reported that the Jc of rare-earth based barium cuprates can be increased by neutron (Wille et al 1988) and proton (Wisniewski et al 1988) irradiation. However gamma ray irradiation of YBaCu3OT_ x did not result in any changes of its superconducting properties (Bohandy et al 1987). On the other hand, reduction of Tc with increasing neutron (Kupfer et al 1987;Cost et al 1988;Wille et al 1988), ion (Clark et al 1987), and electron (Stritzker et al 1988) irradiation has been reported of YBa2Cu307_~,.…”

Section: Introductionmentioning

confidence: 93%

Effect of laser irradiation on the superconducting properties of high-T c SmBa2Cu3O x

et al. 1991

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Studies of the effect of high power laser (Q-switched Ruby laser, 694 nm, 30 ns) irradiation on the critical current density Idc) and magnetic hysteresis at 77 K and temperature variation of microwave induced d.c. voltage on SmBa2CuaO ~ ceramic samples have been performed. Irradiation did not substantially change Tc but caused a strong increase in Jc and magnetic hysteresis at 77 K. The microwave-induced d.c. voltage at 77 K showed appreciable decrease after irradiation. SEM studies showed grain growth due to sintering which improves the interconnectivity among the superconducting grains. These are attributed to physical densification and consequent reduction in the number of weak links. The increase of magnetic hysteresis after laser irradiation is presumably connected with the creation of defects which act as pinning centres. Thermal modelling suggests that on irradiation the surface melts up to a depth of 1# and laser-induced evaporation occurs at energy density of 2-5 J/cm 2.

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Section: Introductionmentioning

confidence: 93%

Effect of laser irradiation on the superconducting properties of high-T c SmBa2Cu3O x

et al. 1991

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“…In this communication we present some new results of investigation of influence of γirradiation on the critical temperature of bulk polycrystalline YBa 2 Cu 3 O 7−δ (YBCO). The disordering of HTSCs with γ-rays was used rather often in previous experiments, especially in the first years after discovery of HTSCs [10][11][12][13][14][15][16][17]. Such type of investigations could have an applied importance in the case of possible use of HTSCs in environments of nuclear reactors or space stations.…”

Section: Introductionmentioning

confidence: 99%

Effect of ?-Irradiation on Superconductivity in Polycrystalline YBa2Cu3O7-?

Белевцев

Volchok

Далакова

et al. 2000

phys. stat. sol. (a)

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A bulk polycrystalline sample of YBa 2 Cu 3 O 7−δ (δ ≈ 0.1) has been irradiated by γ-rays with 60 Co source. Non-monotonic behavior of T c (defined as the temperature at which normal resistance is halved) with increasing irradiation dose Φ (up to about 220 MR) is observed: T c decreases at low doses (Φ ≤ 50 MR) from initial value (≈ 93 K) by about 2 K and then rises, forming minimum. At highest doses (Φ ≥ 120 MR) T c goes down again. The temperature width, δT c , of resistive transition increases rather sharp with dose below 75 MR and somewhat drops at higher dose. We believe that this effect is revealed for the first time at γ-irradiation of high-T c superconductor. The cross sections for the displacement of lattice atoms in YBCO by γ-rays due to the Compton process were calculated, and possible dpa values were estimated. The results obtained are discussed taking into account that sample studied is granular superconductor and, hence, the observed variations of superconducting properties should be connected primarily with the influence of γ-rays on intergrain Josephson coupling.

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“…On this way, the papers dedicated to study gamma irradiation effects on the HTS properties are characterized for a lack of coincidence in criteria and results. Some authors have observed an improvement of the superconducting properties with dose increment (Boiko et at., 1988;Leyva et al, 1992), some others report exactly the opposite (Vasek et al, 1989;Elkholy et al, 1996), and other studies have not found any dependence (Bohandy et al, 1987;Cooksey et al, 1994). These contradictions have not been completely explained yet; some authors even attribute these behaviors to a "sample effect" (Polyak et al, 1990).…”

Section: Introductionmentioning

confidence: 81%