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Hydrostatic presure dependence of the superconducting transition temperature of HgBa2CaCu2O6+δ and HgBa2Ca2Cu3O8+δ

✍ Scribed by A.-K. Klehe; J.S. Schilling; J.L. Wagner; D.G. Hinks

Publisher
Elsevier Science
Year
1994
Tongue
English
Weight
852 KB
Volume
223
Category
Article
ISSN
0921-4534

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✦ Synopsis

The dependence of the superconducting transition temperature Tc (P) on purely hydrostatic pressure to 0.9 GPa has been determined in AC-susceptibility studies in a He-gas pressure system for optimally doped ceramic samples of HgBazCaCu206 +a and HgBaeCaeCu3Os+a with superconducting transitions at Tc (0) ~-126.6 K and 133.9 K, respectively. Tc increases reversibly under hydrostatic pressure at the rates, dTc/dP ~-+ 1.80 4-0.06 K/GPa and + 1.71 d: 0.05 K/GPa, respectively. Within experimental error, these values are the same as found previously for optimally doped single-layered HgBa2CuO4+a, where dTc/dP " + 1.72 + 0.05 K/GPa. Remarkably, the logarithmic volume derivative of Tc is nearly identical for all three compounds, dln To/din V ,-, -1.20 + 0.05, even though the bulk modulus differs by more than 30%. This provides strong evidence that a common mechanism is responsible for the pressure dependence of the superconducting state in all three compounds.

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