• Charge density wave and superconductivity in 2H- and 4H-NbSe2: A revisit

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    • Keywords

       

      Transition metal compounds; superconductivity.

    • Abstract

       

      Good-quality hexagonal NbSe2 single crystals were prepared. In 2H-NbSe2, superconducting and charge density wave (CDW) transitions were found at $T_s = 7.4$ K and $T_c = 35$ K respectively as reported previously. We have noticed that these two transitions are changed to $T_c = 42$ K and $T_s = 6.5$ K, in 4H-NbSe2. Thermopower has shown clear anomaly at CDW transitions. The anisotropic upper critical field was calculated as $\sim 3$ and 6.3 for 2H- and 4H-single crystals around $t = 0.81$, where $t = T/T_s$, from resistivity and explained in terms of coherence length. From the relation, $H_{c2}(T) = H_{c2}(0)[1 − t^2]$, $H^l_{c2}(0)$ was calculated as $\sim 8.15$ T and 16.98 T at $t = 0.84$ in 2H-NbSe2 and 4H-NbSe2 respectively. However, $H^t_{c2}(0) = 2.68$ T for both single crystals.

    • Author Affiliations

       

      I Naik1 A K Rastogi2

      1. Department of Physics, North Orissa University, Baripada 757 003, India
      2. School of Physical Sciences, Jawaharlal Nehru University, New Delhi 110 067, India
    • Dates

       
  • Pramana – Journal of Physics | News

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