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Magnetism and Superconductivity in Iron Pnictides

100%
Singh D.
Acta Physica Polonica A
|
2012
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vol. 121
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issue 5-6
999-1004
EN
The discovery of high temperature superconductivity in iron pnictides and chalcogenides has resulted in surprising new insights into high temperature superconductivity and its relationship with magnetism. Here we provide an overview of some of what is known about these materials and in particular about the interplay of magnetism and superconductivity in them. Similarities and contrasts with cuprate superconductors are emphasized and the superconducting pairing is discussed within the framework of spin fluctuation induced pairing.
2
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Management of Collar Rot of Chickpea (Cicer Arietinum) by Trichoderma Harzianum and Plant Growth Promoting Rhizobacteria

39%
Maurya S., Singh R., Singh D., Singh H., Singh U., Srivastava J.
Journal of Plant Protection Research
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2008
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vol. 48
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issue 3
3
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Leaching of Al-Based Polygrain Quasicrystalline and Related Crystalline Surfaces

33%
Yadav T., Mishra S., Pandey S., Singh D., Lowe M., Tamura R., Mukhopadhyay N., Srivastava O., McGrath R., Sharma H.
Acta Physica Polonica A
|
2014
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vol. 126
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issue 2
629-632
EN
In the present investigation, we have studied leaching on polygrain Al-based quasicrystalline (i-Al_{63}Cu_{25}Fe_{12}) as well as crystalline (B2 phase; Al_{55}Cu_{30}Fe_{15}) alloy surfaces using a 10 mole NaOH solution. The surface was leached at varying times from 30 min to 8 h and subsequently characterized by X-ray diffraction, scanning electron microscopy, transmission electron microscopy and energy dispersive X-ray analysis. Leaching of the samples for 30 min generated a homogeneous layer. However further leaching for 1-8 h yielded nano-size particles on the surface. Spherical microstructure has been observed on the Al-Cu-Fe crystalline surface whereas on the quasicrystalline surface a petal-like microstructure appeared. The implications of the evolution of different microstructures in the context of structure, stability and activity are discussed. The results are compared with the microstructure of leached polygrained samples containing a mixture of different surface orientations.
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