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Dive into the research topics where Asad Niazi is active.

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Featured researches published by Asad Niazi.


Physical Review B | 2002

Superparamagnetic-like ac susceptibility behavior in the partially disordered antiferromagnetic compound Ca 3 CoRhO 6

E. V. Sampathkumaran; Asad Niazi

We report the results of dc and ac magnetization measurements as a function of temperature (1.8 - 300 K) for the spin-chain compound,


Journal of Physics: Condensed Matter | 2001

Low-temperature resistance minimum in non-superconducting 3R-Nb1+xS2 and 3R-GaxNbS2

Asad Niazi; A.K. Rastogi

{\mathrm{Ca}}_{3}{\mathrm{CoRhO}}_{6},


Physical Review B | 2002

Magnetic anomalies in the spin-chain system Sr 3 Cu 1 − x Zn x IrO 6

Asad Niazi; E. V. Sampathkumaran; P. L. Paulose; D. Eckert; A. Handstein; K. H. Müller

which has been recently reported to exhibit a partially disordered antiferromagnetic (PDAF) structure in the range 30\char21{}90 K and spin-glass freezing below 30 K. We observe an unexpectedly large frequency dependence of ac susceptibility in the T range 30\char21{}90 K, typical of superparamagnets. In addition, we find that there is no difference in the isothermal remanent magnetization behavior for the two regimes below 90 K. These findings call for more investigations to understand the magnetism of this compound.


Physical Review B | 2002

Magnetic anomalies in the spin-chain system Sr3Cu1-xZnxIrO6

Asad Niazi; E. V. Sampathkumaran; P. L. Paulose; D. Eckert; A. Handstein; K. H. Müller

We report the structural and electron transport properties of 3R-Nb1+xS2 (x≥0.07) and 3R-GaxNbS2 (0.1≤x≤0.33) prepared as polycrystalline pellets as well as single crystals grown by vapour transport. We observe a resistance minimum in these compounds between 20 and 60 K, with Tmin proportional to x. The resistance scales as ρ/ρmin(T/Tmin) in the range 0.2<T/Tmin<2 for different phases with x≤0.25 whose resistivity differs by an order of magnitude. Powder x-ray diffraction also shows progressively increasing intensity of superlattice lines with cation concentration. The thermopower changes sign around the resistance minimum. The explanation of the resistance minimum and the simultaneous rapid suppression of superconductivity is sought in electron-electron scattering effects in the presence of cation disorder in these narrow-band anisotropic materials.


Physica B-condensed Matter | 2002

Magnetic characteristics of Sr3Cu1−xZnxIrO6, a spin-chain system with competing interactions

Asad Niazi; E. V. Sampathkumaran; P. L. Paulose; D. Eckert; A. Handstein; K. H. Müller

We report the results of ac and dc magnetization (M) and heat-capacity (C) measurements on the solid solution, Sr


Physical Review B | 2001

Magnetic anomalies in the spin chain system, Sr

Asad Niazi; E. V. Sampathkumaran; P. L. Paulose; D. Eckert; A. Handstein; K. H. Müller

_3


Physical Review Letters | 2002

_3

Asad Niazi; P. L. Paulose; E. V. Sampathkumaran

Cu


Solid State Communications | 2001

Cu

Asad Niazi; E. V. Sampathkumaran; P. L. Paulose; D. Eckert; A. Handstein; K. H. Müller

_{1-x}


Pramana | 2002

_{1-x}

Asad Niazi; P. L. Paulose; E. V. Sampathkumaran; Ute C. H. Rodewald; Wolfgang Jeitschko

Zn


Pramana | 2002

Zn

Asad Niazi; P. L. Paulose; E. V. Sampathkumaran; Ute Ch. Rodewald; Wolfgang Jeitschko

_x

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E. V. Sampathkumaran

Tata Institute of Fundamental Research

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P. L. Paulose

Tata Institute of Fundamental Research

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A. Handstein

Tata Institute of Fundamental Research

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D. Eckert

Tata Institute of Fundamental Research

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K. H. Müller

Tata Institute of Fundamental Research

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A.K. Rastogi

Jawaharlal Nehru University

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Wolfgang Jeitschko

Technical University of Dortmund

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A. K. Grover

Tata Institute of Fundamental Research

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Ashwin Tulapurkar

Indian Institute of Technology Bombay

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S. Ramakrishnan

Tata Institute of Fundamental Research

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