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We report the occurrence of superconductivity in polycrystalline samples ofZrTe3 at 5.2 K temperature at ambient pressure. The superconducting statecoexists with the charge density wave (CDW) phase, which sets in at 63K. Theintercalation of Cu or Ag, does not have any bearing on the superconductingtransition temperature but suppresses the CDW state. The feature of CDW anomalyin these compounds is clearly seen in the DC magnetization data. Resistivitydata is analysed to estimate the relative loss of carriers and reduction in thenested Fermi surface area upon CDW formation in the ZrTe3 and the intercalatedcompounds.

Superconductivity at 5.2 K in ZrTe3 polycrystals and the effect of Cu, Ag intercalation