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Papers by J. Gopalakrishnan
Materials Research Bulletin, 2009
We have investigated the structure, magnetic and dielectric properties of the double perovskite o... more We have investigated the structure, magnetic and dielectric properties of the double perovskite oxides, R2NiMnO6 (R=Pr, Nd, Sm, Gd, Tb, Dy, Ho and Y). We could refine powder X-ray diffraction patterns of all the phases on the basis of monoclinic (P21/n) double perovskite structure where Ni and Mn atoms are ordered at 2c and 2d sites, respectively. All the phases
Physical Review B, 1989
... VOLUME 39, NUMBER 10 Flux creep and critical-current anisotropy in Bi2Sr2CaCu20g + 8 BDBiggs,... more ... VOLUME 39, NUMBER 10 Flux creep and critical-current anisotropy in Bi2Sr2CaCu20g + 8 BDBiggs, MN Kunchur, JJ Lin,* and SJ Poon Department of ... the volume magnetization M. For the H ± case, J, is isotropic in the plane normal to the field, as are the sam-ple dimensions ...
The Journal of Physical Chemistry, 1980
ABSTRACT
Journal of the Less Common Metals, 1979
Journal of Inorganic and Nuclear Chemistry, 1970
New phases of the type La/sub 2-x/A/sub x//sup 1 +/CuO/sub 4-y/ have been prepared where A/sup 1 ... more New phases of the type La/sub 2-x/A/sub x//sup 1 +/CuO/sub 4-y/ have been prepared where A/sup 1 +/ is sodium or potassium. The sodium phases are superconducting for x values from 0.2 to 0.5 at temperatures up to about 40 K. In addition, there are unusual magnetic properties below about 10 K that may be indicative of spin glass behavior. Phases of the type La/sub 2-x/K/sub x/CuO/sub 4-y/ could only be prepared with x values up to about 0.1, and these phases are not superconducting above 4.2 K. 10 references, 2 figures, 2 tables.
The Journal of Chemical Thermodynamics, 2007
Solid State Communications, 1975
... For x = 0.15 (ie, BiVO315) E = 0.26 eV, while for the composition x = 0.5 (BiVO3 ), E = 0.33 ... more ... For x = 0.15 (ie, BiVO315) E = 0.26 eV, while for the composition x = 0.5 (BiVO3 ), E = 0.33 eV. The Vol. 17, No.4 ABO3 OXIDES WITH DEFECT PYROCHLORE STRUCTURE 547 FIG. 1. Electrical conductivity and Seebeck coefficient of BiVO315. ...
Science, 1988
New high-temperature superconductors based on oxides of thallium and copper, but not containing b... more New high-temperature superconductors based on oxides of thallium and copper, but not containing barium, have been prepared. A transition temperature (T(c)) of about 85 K is found for (Tl(0.5)Pb(0.5)) Sr(2)CaCu(2)O(7) whereas (Tl(0.5)Pb(0.5))Sr(2)Ca(2)Cu(3)O(9) has a T(c) of about 120 K. Both materials possess tetragonal symmetry with a = 3.80 A, c = 12.05 A for (Tl(0.5)Pb(0.5))Sr(2)CaCu(2)O(7), and a = 3.81 A, c = 15.23 A for (Tl(0.5)Pb(0.5))Sr(2)Ca(2)Cu(3)O(9). A structure refinement of the latter phase has been carried out with single-crystal x-ray diffraction data.
Physica C: Superconductivity, 1989
ABSTRACT
Physica C: Superconductivity, 2003
Physica C: Superconductivity, 1989
Physica C: Superconductivity, 1988
Crystals of the new high temperature superconductor Bi2Sr3-xCaxCu2O8+y have been grown and studie... more Crystals of the new high temperature superconductor Bi2Sr3-xCaxCu2O8+y have been grown and studied. Single crystal x-ray diffraction data were used to determine a pseudo tetragonal structure based on an A-centered orthorhombic cell with a = 5.399 Å, b = 5.414 Å, and c = 30.904 Å. The structure contains the copper-oxygen sheets as in La2CuO4 and YBa2Cu3O7, but the copper-oxygen
Physica C: Superconductivity, 1989
Structural refinements of the new compounds Bi 2 Sr 3−x Y x Cu 2 O 8+y in the range of x that giv... more Structural refinements of the new compounds Bi 2 Sr 3−x Y x Cu 2 O 8+y in the range of x that gives insulating rather than superconducting behaviour (x≈0.6 and 1.0) have been obtained from single crystal X-ray and neutron powder diffraction data. Results indicate oxygen ...
Nature, 1988
Nature is the international weekly journal of science: a magazine style journal that publishes fu... more Nature is the international weekly journal of science: a magazine style journal that publishes full-length research papers in all disciplines of science, as well as News and Views, reviews, news, features, commentaries, web focuses and more, covering all branches of science and ...
Materials Research Bulletin, 2009
We have investigated the structure, magnetic and dielectric properties of the double perovskite o... more We have investigated the structure, magnetic and dielectric properties of the double perovskite oxides, R2NiMnO6 (R=Pr, Nd, Sm, Gd, Tb, Dy, Ho and Y). We could refine powder X-ray diffraction patterns of all the phases on the basis of monoclinic (P21/n) double perovskite structure where Ni and Mn atoms are ordered at 2c and 2d sites, respectively. All the phases
Physical Review B, 1989
... VOLUME 39, NUMBER 10 Flux creep and critical-current anisotropy in Bi2Sr2CaCu20g + 8 BDBiggs,... more ... VOLUME 39, NUMBER 10 Flux creep and critical-current anisotropy in Bi2Sr2CaCu20g + 8 BDBiggs, MN Kunchur, JJ Lin,* and SJ Poon Department of ... the volume magnetization M. For the H ± case, J, is isotropic in the plane normal to the field, as are the sam-ple dimensions ...
The Journal of Physical Chemistry, 1980
ABSTRACT
Journal of the Less Common Metals, 1979
Journal of Inorganic and Nuclear Chemistry, 1970
New phases of the type La/sub 2-x/A/sub x//sup 1 +/CuO/sub 4-y/ have been prepared where A/sup 1 ... more New phases of the type La/sub 2-x/A/sub x//sup 1 +/CuO/sub 4-y/ have been prepared where A/sup 1 +/ is sodium or potassium. The sodium phases are superconducting for x values from 0.2 to 0.5 at temperatures up to about 40 K. In addition, there are unusual magnetic properties below about 10 K that may be indicative of spin glass behavior. Phases of the type La/sub 2-x/K/sub x/CuO/sub 4-y/ could only be prepared with x values up to about 0.1, and these phases are not superconducting above 4.2 K. 10 references, 2 figures, 2 tables.
The Journal of Chemical Thermodynamics, 2007
Solid State Communications, 1975
... For x = 0.15 (ie, BiVO315) E = 0.26 eV, while for the composition x = 0.5 (BiVO3 ), E = 0.33 ... more ... For x = 0.15 (ie, BiVO315) E = 0.26 eV, while for the composition x = 0.5 (BiVO3 ), E = 0.33 eV. The Vol. 17, No.4 ABO3 OXIDES WITH DEFECT PYROCHLORE STRUCTURE 547 FIG. 1. Electrical conductivity and Seebeck coefficient of BiVO315. ...
Science, 1988
New high-temperature superconductors based on oxides of thallium and copper, but not containing b... more New high-temperature superconductors based on oxides of thallium and copper, but not containing barium, have been prepared. A transition temperature (T(c)) of about 85 K is found for (Tl(0.5)Pb(0.5)) Sr(2)CaCu(2)O(7) whereas (Tl(0.5)Pb(0.5))Sr(2)Ca(2)Cu(3)O(9) has a T(c) of about 120 K. Both materials possess tetragonal symmetry with a = 3.80 A, c = 12.05 A for (Tl(0.5)Pb(0.5))Sr(2)CaCu(2)O(7), and a = 3.81 A, c = 15.23 A for (Tl(0.5)Pb(0.5))Sr(2)Ca(2)Cu(3)O(9). A structure refinement of the latter phase has been carried out with single-crystal x-ray diffraction data.
Physica C: Superconductivity, 1989
ABSTRACT
Physica C: Superconductivity, 2003
Physica C: Superconductivity, 1989
Physica C: Superconductivity, 1988
Crystals of the new high temperature superconductor Bi2Sr3-xCaxCu2O8+y have been grown and studie... more Crystals of the new high temperature superconductor Bi2Sr3-xCaxCu2O8+y have been grown and studied. Single crystal x-ray diffraction data were used to determine a pseudo tetragonal structure based on an A-centered orthorhombic cell with a = 5.399 Å, b = 5.414 Å, and c = 30.904 Å. The structure contains the copper-oxygen sheets as in La2CuO4 and YBa2Cu3O7, but the copper-oxygen
Physica C: Superconductivity, 1989
Structural refinements of the new compounds Bi 2 Sr 3−x Y x Cu 2 O 8+y in the range of x that giv... more Structural refinements of the new compounds Bi 2 Sr 3−x Y x Cu 2 O 8+y in the range of x that gives insulating rather than superconducting behaviour (x≈0.6 and 1.0) have been obtained from single crystal X-ray and neutron powder diffraction data. Results indicate oxygen ...
Nature, 1988
Nature is the international weekly journal of science: a magazine style journal that publishes fu... more Nature is the international weekly journal of science: a magazine style journal that publishes full-length research papers in all disciplines of science, as well as News and Views, reviews, news, features, commentaries, web focuses and more, covering all branches of science and ...