Hole Concentration in GdBaSrCu­_3-xZn_xO_7-δ System: Interplay among Superconductivity, Stripe Order and Pseudogap

  

Tet Vui CHONG^1*, Chiew Han LIOW², Suan Cheng CHUAH³, Shiro KAMBE⁴ and Roslan ABD-SHUKOR⁵

 

¹CAE, Center for Plasma Research, INTI International University, Persiaran Perdana BBN, Putra Nilai, 71800 Nilai, Negeri Sembilan, Malaysia

²CAE, INTI International University, Persiaran Perdana BBN, Putra Nilai, 71800 Nilai, Negeri Sembilan, Malaysia

³FOBCAL, INTI International University, Persiaran Perdana BBN, Putra Nilai, 71800 Nilai, Negeri Sembilan, Malaysia

⁴Graduate School of Science and Engineering, Yamagata University, 4-3-16 Johnan, Yonezawa City, Yamagata, 992-8510, Japan

⁵School of Applied Physics, Universiti Kebangsaan Malaysia, 43600 Bangi, Selangor, Malaysia

Corresponding author: chongtetvui@gmail.com

Abstract: Polycrystalline GdBaSrCu3O7-δ samples with Zn substitution were prepared via solid state reaction. The superconducting properties of Zn substituted GdBaSrCu3O7-δ samples have been studied by X-ray diffraction, resistivity, AC susceptibility and oxygen content measurements. Hole concentration of these samples was determined according to the oxygen content measured by iodometric titration method. Zn substitution doesn’t change the tetragonal structure of the sample but reduces both Tc and hole concentration, which is attributed to hole filling by Zn. The non-magnetic Zn2+ substitution have significant effects on the oxygen content and effective Cu valence of these d-wave superconductors. The correlation between calculated hole concentration from oxygen content data and Tc obtained leads to the possibly interplay among the superconducting and stripe correlations in GdBaSrCu3-xZnxO7-δ samples.

 

Keywords: Hole concentration, non-magnetic impurity, transition temperature.