Abstract
A series of CuxTaSe2 (0 ≤ x ≤ 0.12) samples were prepared and characterized via x-ray diffraction, magnetization, resistivity, and heat capacity measurements. We found that the charge density wave phases in 2H-CuxTaSe2 are noticeably suppressed and the superconducting critical temperatures Tc are significantly enhanced from 0.14 K for pure TaSe2 to about 2 K in the Cu-doped samples. The maximum Tc of 2.7 K was obtained in the optimally doped sample with x = 0.07. The crystal structure of the Cu0.07TaSe2 was refined by the Rietveld method. Magnetic measurements revealed that Cu0.07TaSe2 is a bulk superconductor with upper critical field Hc2 (0) of 4.41 T. Analysis of specific heat data shows that the effective electron–phonon coupling and density of states at the Fermi level are enhanced in the Cu-doped samples. We present an electronic phase diagram for the 2H-CuxTaSe2 system.
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