Dielectric properties of Cu0.5Tl0.5Ba2Ca3Cu4O12−δ bulk superconductor

Mumtaz, M.; Khan, Nawazish A.

doi:10.1016/j.physc.2009.03.055

Cited by 26 publications

(7 citation statements)

References 36 publications

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“…On the other hand, interfacial polarization is more sensitive in the low frequency range of 1 kHz and it may extend to few kHz range [25], since only atomic polarization (10 10 -10 13 Hz) and electronic polarization (f≥10 13 Hz) become effective at high frequencies. Therefore, in such high frequency range the contribution to dielectric constant is small enough to be ignored.…”

Section: Introductionmentioning

confidence: 99%

Investigation of dielectric relaxation and ac electrical conductivity using impedance spectroscopy method in (AuZn)/TiO2/p-GaAs(110) schottky barrier diodes

Şafak-Asar

Asar

Altındal

et al. 2015

Journal of Alloys and Compounds

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Section: Introductionmentioning

confidence: 99%

Investigation of dielectric relaxation and ac electrical conductivity using impedance spectroscopy method in (AuZn)/TiO2/p-GaAs(110) schottky barrier diodes

Şafak-Asar

Asar

Altındal

et al. 2015

Journal of Alloys and Compounds

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“…5 O 2 thin films prepared by pulsed laser deposition technique was found exhibiting characteristics that nominate it as negative capacitance field‐effect transistors. [ 20 ] From another point of view, based on our current investigation, altering the content of Ag in AgMn alloys resulted in some structural and electrical modification that allowed tunability in the dielectric responses. Earlier studies which targeted variation of Ag content in the alloys have shown that rapidly solidified (by melt‐spinning in an Ar atmosphere) AgMn alloys with a high Mn concentration can exhibit enhanced antiferromagnetic features.…”

Section: Resultsmentioning

confidence: 92%

Preparation and Characterization of Orthorhombic AgMn Alloys by the Pulsed Laser Welding Technique

Khanfar¹,

Qasrawi

2022

Crystal Research and Technology

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Herein, AgMn alloys are prepared by the pulsed laser welding technique in an argon atmosphere. The effect of the laser pulses width and stoichiometric composition of the alloys on the structural, compositional, morphological, and electrical properties are investigated. In contrast to the traditional preparation techniques which reveal cubic structure of AgMn alloys, the pulsed laser welding technique reveals the orthorhombic phase of the alloys. The lattice parameters of the orthorhombic phase of AgMn are α=13.0250normalÅ,b=15.7768normalÅ,c=2.6728normalÅ$\alpha = 13.0250\ \text{\AA} ,\ b=15.7768\ \text{\AA} ,\ c=2.6728\ \text{\AA} $. It is observed that pulse widths of 50 ms are the optimum from preparing these alloys. From an electrical point of view, the AgMn alloys exhibit negative dielectric constant and negative conductance effect in the microwave frequency domain. The impedance spectroscopy analyses in the frequency domain of 0.01–1.80 GHz have shown that AgMn alloys can be employed as band filters with return loss value of ≈16 dB. The features of the AgMn alloys which are achieved by the pulsed laser welding technique nominate them for use as negative capacitance and negative conductance transistors. These devices are suitable for noise reduction and parasitic capacitance cancellation.

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“…Dielectric constants ( r   , r   ) and dielectric loss ( tan ) of Tl-based high temperature superconductors (HTSCs) were found to depend strongly on operating temperature and frequency of external applied ac-field [6]. Negative capacitance (NC) phenomenon was observed in Cu 0.5 Tl 0.5 Ba 2 Ca 3 Cu 4y Zn y O 12δ (y = 0, 3) superconductor at different frequencies and temperature [13,18]. Effect of oxygen post-annealing on superconductivity and dielectric properties of Cu 0.5 Tl 0.5 Ba 2 Ca 3 (Cu 4y Cd y )O 12δ was investigated [19].…”

Section: Introductionmentioning

confidence: 99%

Dielectric properties of (Zn) x /CuTl-1223 nanoparticle-superconductor composites

et al. 2016

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Zinc (Zn) nanoparticles and (Cu 0.5 Tl 0.5 )Ba 2 Ca 2 Cu 3 O 10δ (CuTl-1223) superconducting phase were prepared separately by sol-gel and solid-state reaction methods, respectively. Zn nanoparticles were added in CuTl-1223 superconducting matrix with different weight percentage during the final sintering process to obtain (Zn) x /CuTl-1223 (x = 0-4 wt%) nanoparticle-superconductor composites. The effect of Zn nanoparticles on structural, morphological, superconducting, and dielectric properties of CuTl-1223 phase was investigated. The addition of these Zn nanoparticles has not affected the crystal structure of host CuTl-1223 superconducting phase. Superconducting properties were enhanced after the addition of Zn nanoparticles up to certain optimum content (i.e., x = 1 wt%), which were due to improved inter-grain connectivity by healing up of micro-cracks and reduction of defects like oxygen deficiencies, etc. The activation energy (U) was increased after the addition of Zn nanoparticles in CuTl-1223 phase. The dielectric properties of these samples (i.e., dielectric constant, dielectric loss) were determined by experimentally measured capacitance (C) and conductance (G) as a function of frequency at room temperature. The addition of metallic Zn nanoparticles in CuTl-1223 matrix has overall suppressed the dielectric parameters of (Zn) x /CuTl-1223 nanoparticlesuperconductor composites. The metallic Zn nanoparticles played a significant role in inter-grain couplings by filling the voids and pores.

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Dielectric properties of Cu0.5Tl0.5Ba2Ca3Cu4O12−δ bulk superconductor

Cited by 26 publications

References 36 publications

Investigation of dielectric relaxation and ac electrical conductivity using impedance spectroscopy method in (AuZn)/TiO2/p-GaAs(110) schottky barrier diodes

Investigation of dielectric relaxation and ac electrical conductivity using impedance spectroscopy method in (AuZn)/TiO2/p-GaAs(110) schottky barrier diodes

Preparation and Characterization of Orthorhombic AgMn Alloys by the Pulsed Laser Welding Technique

Dielectric properties of (Zn) x /CuTl-1223 nanoparticle-superconductor composites

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