Lower critical fields in BKBO single crystals

S. Barilo, V. Gatalskaya, S. V. Shiryaev, A. Shestac
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Abstract

We performed dc-magnetization measurements in low magnetic fields on single crystals of Ba1-xKxBiOy with the different potassium content. The single crystal reveal the superconducting transition at 29-31K. It is shown that the lower critical fields HCl in crystals amount to 104 Oe, 126 and 112 Oe. The values of the penetration depth (lambda) are equal to 2530 A, 2430 A and 2670 A for x equals 0.34, 0.37 and 0.4 respectively.
BKBO单晶的低临界场
我们对不同钾含量的Ba1-xKxBiOy单晶进行了低磁场下的直流磁化测量。单晶在29-31K时发生超导转变。结果表明,晶体中HCl的下临界场为104 Oe、126 Oe和112 Oe。当x = 0.34、0.37、0.4时,穿透深度lambda分别为2530 A、2430 A、2670 A。
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