Monday, April 12, 2010

Ferromagnetism in Cu-doped ZnSe semiconducting quantum dots

Ferromagnetism in Cu-doped ZnSe semiconducting quantum dots: "

Abstract  
The projection of integrating optical, magnetic and electronic functionalities into a single material have aggravated passionate
attention in mounting wide band gap diluted magnetic semiconductor (DMS) in the midst of room temperature ferromagnetism.
We report the evidence of ferromagnetism in Cu-doped ZnSe quantum dots (QDs) below room temperature, grown from a single source
precursor by lyothermal method with the sizes of approximately 3.2–5.14 nm. QDs mainly exhibit paramagnetic behavior between
80 and 300 K, with a weak ferromagnetic/anti-ferromagnetic exchange at lower temperature as observed by superconducting quantum
interference device (SQUID) magnetometer. From the Curie–Weiss behavior of the susceptibility, Curie temperature (T
c) of Cu-doped ZnSe sample has been evaluated. From EPR, we obtain the Lande-g factor in the Zeeman interaction term as 2.060. Photoluminescence and EPR measurements support and confirm the view that
Cu2+ substitutes for Zn2+ in Cu-doped ZnSe quantum dots.

  • Content Type Journal Article
  • Category Research Paper
  • DOI 10.1007/s11051-010-9914-5
  • Authors
    • Pushpendra Kumar, Banaras Hindu University Department of Physics, Faculty of Science Varanasi 221005 India
    • Kedar Singh, Banaras Hindu University Department of Physics, Faculty of Science Varanasi 221005 India
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