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However, a small amount of Ta significantly reduced the second critical field (Hc2) from 65 kOe for x = 0.0 (ZnCr2Se4 matrix) up to 42.2 kOe for x = 0.12, above which the spin helical system changed to ferromagnetic (FM). The Hc2 reduction can lead to strong competition among AFM and FM interactions and spin frustration, as the specific heat under magnetic fields H less then Hc2 shows a strong field decrease in TN.Vaccination programs against COVID-19 are being scaled up. We aimed to assess the effects of vaccine characteristics on vacc
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