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Chaddah, P
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2 Citations
A scheme to calculate the electron momentum density in simple liquid metals, with the effect ofboth electron correlations and ionic potentials included, is given. This scheme is applied to the case of liquid aluminium. The results are substantially different from calculations considering only the ion potentials, and also from the results for a homogeneous electron gas of corresponding density.
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By
Kumar, Shailendra; Ravikumar, G; Mishra, P K; Chaddah, P; Dasannacharya, B A; Prasad, Ram; Soni, N C
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2 Citations
We have studied the variation of low field magnetization hysteresis in YBa2Cu3O7 as a function of the maximum magnetic field applied during a hysteresis cycle (1 G<Hmax<7.3 G) and also as a function of temperature (77 K<T<95 K). The remnant magnetization is studied as a function ofHmax andT and the measured dependences are explained using the extended critical state model. The potential of this technique as a contactless method of probing the temperature dependence ofJc is discussed.
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By
Ravi Kumar, G; Chaddah, P
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4 Citations
We present a calculation of the isothermal magnetization hysteresis curves appropriate to highTcsuperconductors. We discuss the nature of the low field anomaly as one goes from this strong pinning case to the weak pinning case. We show that the shape of the equilibrium (thermodynamic) magnetization curve is recovered in the limit ofJcapproaching zero.
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Bhagwat, K V; Chaddah, P
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21 Citations
We present exact solutions of Bean’s critical state model for some sample shapes having non-zero demagnetization factorN. Virgin and hysteresis magnetization curves are obtained for samples in the shape of (i) a sphere (ii) a spheroid (iii) a cylinder of circular cross-section with its axis perpendicular to the field and (iv) a cylinder of elliptical cross section with its axis perpendicular to the field. Some interesting features seen in these first solutions forN ≠ 0 are discussed.
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By
Malik, M K; Raghavan, R V; Chaddah, P; Mishra, PK; Ravi Kumar, G; Dasannacharya, BA
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2 Citations
We report critical current measurements on sintered Y0.35Ba0.65CuOy. The sample, in the perovskite phase, shows zero resistance at 87 K. The critical current transition is seen, in zero field and at 77 K, at a current densityJc of 50 A/cm2.
By
Chaddah, P
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19 Citations
We shall discuss magnetization and transport measurements in materials exhibiting a broad first-order transition. The phase transitions would be caused by varying magnetic field as well as temperature, and we concentrate on ferro- to antiferromagnetic transitions in magnetic materials. We distinguish between metastable supercooled phases and metastable glassy phase.
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Chaddah, P
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It is argued, from the dependence of the critical current density and ofTc on applied magnetic field, that the pairing interaction in highTc superconductors must be strongly field-dependent.
By
Ravi Kumar, G; Chaddah, P
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13 Citations
Muller and coworkers have introduced the concept of a superconducting glass to explain some magnetization data in highTcsuperconductors. We explain this data using conventional ideas of type-II superconductivity.
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