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
Diserahkan: 12 Februari 2018/Diterima: 10
Mac 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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*Pengarang untuk
surat-menyurat; email: ras@ukm.edu.my