-The effect of pressure on superconductivity of "111" type Na 1-x FeAs is investigated through temperature dependent electrical resistance measurement in a diamond anvil cell. The superconducting transition temperature (T c ) increases from 26
Chlorine-containing ( Sr , Ca )3 Cu 2 O 4+δ Cl 2-y (0212- Cl ) superconductor is the high-Tc Cu -oxide superconductor (HTSC) with Tc=80 K and was synthesized under high-pressure and high-temperature. The 0212- Cl has double [ CuO 2] planes and the apical oxygen are replaced by Chlorine. We measured the resistance of 0212- Cl under high pressure using a diamond-anvil cell up to 13.3 GPa and two-terminal ac-method to investigate the pressure dependence of Tc. Tc of 0212- Cl increases gently with increasing pressure.
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