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Rapid synthesis and magnetic and electronic transport properties of FeSe1-x superconductors

J. L. YANG1,2,* , W. J. REN1, D. LI1, Z. D. ZHANG1

Affiliation

  1. Shenyang National Laboratory for Materials Science, Institute of Metal Research, and International Centre for Materials Physics, Chinese Academy of Sciences, 72 Wenhua Road, Shenyang 110016, People’s
  2. College of Materials Science and Engineering, Liaoning Technical University, 47 Zhonghua Road, Fuxin 123000, People’s Republic of China

Abstract

Tetragonal PbO-type FeSe1-x (0.04 ≤ x ≤ 0.12) compounds are synthesized by a rapid process of annealing at 673 K for 30 min after ball-milling 5h (single anneal). The superconducting transition temperature is ~7 K. However, zero-resistance is not observed in these samples because of the large distance between grains. After increase of annealing time to 20 h (double anneal), the zero resistance phenomenon was observed and the temperature is 6.0, 6.4 and 6.6 K for x = 0.04, 0.08 and 0.12, respectively. All samples exhibits Meissner effect, but the magnetization is not a negative value because of the positive magnetization contribution of ferromagnetic/ferrimagnetic impurities existing in the samples..

Keywords

Magnetization, Mechanical alloying, Superconductor.

Submitted at: Nov. 10, 2012
Accepted at: April 11, 2013

Citation

J. L. YANG, W. J. REN, D. LI, Z. D. ZHANG, Rapid synthesis and magnetic and electronic transport properties of FeSe1-x superconductors, Journal of Optoelectronics and Advanced Materials Vol. 15, Iss. 3-4, pp. 235-238 (2013)