A K Grover
Articles written in Pramana – Journal of Physics
Volume 28 Issue 6 June 1987 pp 1- Rapid Communications
Electromagnetic response of a single phase Y-Ba-Cu-O compound superconducting in the 90 K range
V Nagarajan P L Paulose A K Grover S K Dhar E V Sampathkumaran
The results of x-ray diffraction, electrical resistance, DC and AC magnetization studies on two specimens of compositions Y2.1Ba3.9Cu6O14−δ and Y1.8Ba4.2Cu6O14−δ are presented. Our studies confirm that La3Ba3Cu6O14 type orthorhombic phase is responsible for superconductivity in the 90 K range. The heat treatment that yields high quality samples with sharp transition in electrical resistance as well as in AC magnetic susceptibility measurements is described. Magnetic response just below
Volume 30 Issue 2 February 1988 pp 1- Rapid Communications
Anomalous magnetic hysteresis loops and small
A K Grover C Radhakrishnamurty P Chaddah G Ravi Kumar G V Subbarao
We have studied the hysteresis loops of RBa2Cu3O7 (R=Gd, Ho and Y) and detected anomalies in some of them. The observed anomalies support a recent prediction by Ravi Kumar and Chaddah based on an extension of Bean’s model. The anomalies indicate low
Volume 30 Issue 6 June 1988 pp 569-595 Condensed Matter Physics
A K Grover C Radhakrishnamurty P Chaddah G Ravi Kumar G V Subba Rao
We present DC and low frequency AC magnetization measurements on various RBa2Cu3O7 superconductors. We identify features intrinsic to these compounds, and establish the features originating from intergranular links in sintered pellets. The isothermal magnetization curves, and the temperature dependence of magnetization in field-cooled and zero field-cooled states are shown to be consistent with the calculations done following a recent extension of Bean’s model. Low field anomalies predicted within this model are observed, and yield
Volume 33 Issue 2 August 1989 pp 297-313 Condensed Matter Physics
Thermomagnetic history effects in niobium and its implication for H
A K Grover P L Paulose P Chaddah G Ravikumar
The existence of a remanent magnetization (
Volume 37 Issue 6 December 1991 pp 525-538 Research Articles
A K Grover S Ramakrishnan Ravi Kumar P L Paulose S K Malik P Chaddah
A comparison has been made of irreversibility temperature determined by four different methods in few specimens of lead (type-I) and niobium (type-II). The merger of
Volume 38 Issue 6 June 1992 pp 641-667 Research Articles
Magnetization studies in niobium and YBa2Cu3O7 samples
B V B Sarkissian A K Grover G Balakrishnan Ravi Kumar P L Paulose R Vijayaraghavan V Sankaranarayanan C K Subramanian
The results of experimental studies on hysteresis in magnetization, thermomagnetic history effects, anomalous variations in magnetic hysteresis curves and the decay rates of magnetization obtained under different thermomagnetic histories in specimens of conventional and high temperature superconductors are presented. The Bean’s critical state model is considered adequate to explain magnetic behaviour in conventional hard superconductors. The similarity in the general features of the results of different experiments on specimens of the two families of superconductors underscores the efficacy of the said model to understand some aspects of the macroscopic magnetic response of high temperature superconductors as well. For instance, the isothermal magnetization hysteresis loop which comprises of magnetization curves along forward (−
Volume 42 Issue 3 March 1994 pp 193-222
A K Grover F Iga Y Yamaguchi N Aoki K Ino N Goyal Y Nishihara
The Bi2Sr2CaCu2O8 system is viewed as an archetypal of superconductors modelled as Josephson coupled CuO2 bilayers. The isothermal and temperature dependent DC and AC magnetization measurements for
Volume 45 Issue 3 September 1995 pp 261-269
Geometry effect on the nonlinear magnetic response of YBa2Cu3O7−y
Parshant Batham S B Roy Shailendra Kumar A K Pradhan A K Grover P Chaddah Ram Prasad N C Soni
Results are presented for study of nonlinear magnetization of a sintered YBa2Cu3O7−y pellet of different thickness of a sample subjected to very low magnetic field. On cooling the sample below
Volume 58 Issue 5-6 May 2002 pp 937-947 Physics Of Vortex State
D Pal S Ramakrishnan A K Grover D Dasgupta Bimal K Sarma
Results of an investigation of the path dependence of the critical current density
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