Sains Malaysiana 47(7)(2018): 1579–1583

http://dx.doi.org/10.17576/jsm-2018-4707-28

Electrical Properties and AC Susceptibility of CdTe Added Tl₂Ba₂CaCu₂O₈-δ Superconductor

(Sifat Elektrik dan Kerentanan AU Superkonduktor Tl₂Ba₂CaCu₂O₈-δ Ditambah dengan CdTe)

K. MUHAMMAD-AIZAT & R. ABD-SHUKOR*

School of Applied Physics, Faculty of Science and Technology, Universiti Kebangsaan Malaysia, 43600 UKM Bangi, Selangor Darul Ehsan, Malaysia

Received: 12 February 2018/Accepted: 10 March 2018

ABSTRACT

Information on semiconductor/superconductor interface is important in fabricating devices of such hybrid systems. In this paper the electrical properties and AC susceptibility of Tl₂Ba₂CaCu₂O₈ (Tl-2212) superconductor added with CdTe semiconductor are reported. Samples with nominal starting composition Tl₂Ba₂CaCu₂O₈(CdTe)x with x = 0 to 0.20 weight percent (wt. %) have been prepared by the solid-state reaction method. X-ray diffraction patterns showed essentially the Tl-2212 phase with presence of impurities (CuO and Tl₂Ba₂CuO₆) for x ≥ 0.05 wt. % but did not change the Tl-2212 structure which is tetragonal with lattice parameter a = b ≠ c. The critical onset temperature, Tc-onset for all samples was between 104 and 108 K while the critical zero resistance temperature, Tc-zero was from 93 to 95 K. The superconducting transition determined by AC susceptibility measurement showed Tcχ’ between 101 and 103 K. The peak temperature, Tp of the imaginary part of the susceptibility χ” decreased for x = 0.05 and then increased for x > 0.05. This indicated that the superconducting grains were strongly coupled for x > 0.05 as a result of CdTe addition. The intergrain critical current density, Jc at Tp for the x = 0.2 sample Jc (Tp = 95 K) = 23 A cm-2 was the highest among all samples. This sample also showed the highest Tp indicating CdTe improved the flux pinning of the Tl-2212 phase. This result can be useful in the fabrication of semiconductor/superconductor (Tl-2212) hybrid devices.

Keywords: Intergrain coupling; superconductor/semiconductor interface; Tl₂Ba₂CaCu₂O₈-δ

ABSTRAK

Maklumat tentang antara muka semikonduktor/superkonduktor adalah penting dalam pembuatan peranti sistem hibrid. Kajian ini melaporkan sifat elektrik dan kerentanan arus ulang alik (AU) superkonduktor Tl₂Ba₂CaCu₂O₈ (Tl-2212) ditambah dengan semikonduktor CdTe. Sampel Tl₂Ba₂CaCu₂O₈(CdTe)x dengan komposisi penambahan x = 0 hingga 0.20 peratus berat (% bt.) telah disediakan dengan menggunakan kaedah tindak balas keadaan pepejal. Corak pembelauan sinar-X menunjukkan kehadiran fasa Tl-2212 dengan kewujudan bendasing (CuO dan Tl₂Ba₂CuO₆) bagi x ≥ 0.05 % bt. tetapi tidak berubah fasa dan struktur asal sistem Tl-2212 iaitu struktur tetragonal dengan parameter kekisi a = b ≠ c. Suhu genting mula, Tc-mula sampel adalah antara 104 hingga 108 K manakala suhu genting sifar, Tc-sifar adalah antara 93 hingga 95 K. Peralihan kesuperkonduksian menggunakan pengukuran kerentanan AU menunjukkan julat suhu Tcc antara 101 hingga 103 K. Suhu puncak, Tp bahagian khayalan kerentanan, χ” berkurang untuk x = 0.05 dan meningkat untuk x > 0.05. Ini menunjukkan bahawa butiran superkonduktor bergandingan secara kuat untuk x > 0.05 disebabkan penambahan CdTe. Ketumpatan arus genting antara butiran, Jc pada Tp untuk sampel x = 0.20, Jc (Tp = 95 K) = 23 A cm-2 merupakan nilai tertinggi antara kesemua sampel. Sampel ini juga mencatatkan Tp tertinggi yang menunjukkan CdTe menguatkan pengepinan fluks bagi fasa Tl-2212. Keputusan kajian ini berguna untuk penghasilan peranti hibrid semikonduktor/superkonduktor (Tl-2212).

Kata kunci: Antara muka superkonduktor/semikonduktor; gandingan antara butiran; Tl₂Ba₂CaCu₂O₈-δ

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*Corresponding author; email: ras@ukm.edu.my