Anomalous magnetic properties of Mn-implanted InN thin films

作者：Chang P H^*; Chen H C; Lin J W; Lai M X; Hung S Y; Lee M J

来源：Thin Solid Films, 2016, 618: 184-188.

DOI：10.1016/j.tsf.2016.02.050

• InN
• Mn-implanted
• Meissner effect
• Superconductivity
• Magnetic semiconductor

Anomalous magnetic properties of C-axis-oriented Mn-implanted InN thin films on GaN/sapphire substrates are reported. X-ray diffraction analysis revealed Mn-implanted InN films of a high-quality crystal phase with wurtzite structure. All samples show n-type conductivity by Hall measurements. The un-implanted InN/GaN/Al2O3 sample with a carrier concentration of 1.6 x 10(21) cm(-3) (n(2D) = 8 x 10(16) cm-(2)) exhibits increasing magnetization with decreasing temperature and did not appear superconductive above 1.8 K. After Mn-ion implantation, the appearance of the Meissner effect with superconducting onset temperature near 2.4 K was observed. The superconducting volume fraction chi is near 36% at 2.2 K. Moreover, type-II behavior was further characterized by field-dependent magnetization measurement.

• 出版日期2016-11-1