THE PENETRATION DEPTH OF OR-EQUAL-TO-DELTA-LESS-THAN-OR-EQUAL-TO-0.35(DELTA WITH 0.07)

The magnetic penetration depth lambda(T) of three HgBa2CuO4+delta samp les with 0.16 less than or equal to delta less than or equal to 0.27 h as been determined from the reversible magnetization. The obtained lam bda follows a BCS-like correlation of 1/lambda(2) proportional to 1-(T /T-c)(2) over whole measured temperature range in an underdoped sample with T-c similar to 90 K, but deviates significantly from similar fit s in an overdoped sample with the same T-c and an optimum doped sample , whose 1/lambda(2)'s depends on T nearly linearly below T-c/2. This a symmetry between rile underdoped and overdoped samples suggests that t he T-dependence of 1/lambda(2) is affected by doping in a complicated way.