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Specific heat experiments on a well-characterized polycrystalline sample ofthe BiS2 based superconductor Bi4O4S3 revealed that it shows a crear specificheat anomaly at about Tc = 4.4 K, consistent with Tc from the resistivity anddc susceptibility. This observation indicates the superconductivity of Bi4O4S3to be bulk in nature.

Bulk superconductivity in Bi4O4S3 revealed by specific heat measurement