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Synthesis and physical properties of multilayered cuprates
Copyright policy )Abstract The multilayered cuprates of HgBa 2 Ca n −1 Cu n O y (Hg-system) and Ba 2 Ca n −1 Cu n O 2 n (O, F) (F-system) ( n = 5–9) have been synthesized under high-pressure to investigate the variation of T c . The a - and c -parameters showed reasonable behavior: as the n increases from 5 to 9 the a -parameter approached that of an infinite layer CaCuO 2 (IL) and the average interval of c (or c /2) was close to the c -parameter of the IL. All the samples showed high T c values of about 100 and 80 K for Hg- and F-system, respectively. In addition, the T c was almost constant for n ⩾ 5 for both systems. We have shown that the T c variations can be explained using inhomogeneous charge distribution model as follows. The high T c value is maintained because the charge reservoir layer supplies enough carriers for superconductivity to the adjacent CuO 2 planes (OP) even for large n . The T c is independent of n because the carrier concentration of OP is insensitive to n for large n .
Microsoft Academic Graph classification: Charge-carrier density Cuprate Superconductivity Condensed matter physics Charge density High pressure Analytical chemistry Materials science
Electrical and Electronic Engineering, Energy Engineering and Power Technology, Condensed Matter Physics, Electronic, Optical and Magnetic Materials
Electrical and Electronic Engineering, Energy Engineering and Power Technology, Condensed Matter Physics, Electronic, Optical and Magnetic Materials
Microsoft Academic Graph classification: Charge-carrier density Cuprate Superconductivity Condensed matter physics Charge density High pressure Analytical chemistry Materials science
Abstract The multilayered cuprates of HgBa 2 Ca n −1 Cu n O y (Hg-system) and Ba 2 Ca n −1 Cu n O 2 n (O, F) (F-system) ( n = 5–9) have been synthesized under high-pressure to investigate the variation of T c . The a - and c -parameters showed reasonable behavior: as the n increases from 5 to 9 the a -parameter approached that of an infinite layer CaCuO 2 (IL) and the average interval of c (or c /2) was close to the c -parameter of the IL. All the samples showed high T c values of about 100 and 80 K for Hg- and F-system, respectively. In addition, the T c was almost constant for n ⩾ 5 for both systems. We have shown that the T c variations can be explained using inhomogeneous charge distribution model as follows. The high T c value is maintained because the charge reservoir layer supplies enough carriers for superconductivity to the adjacent CuO 2 planes (OP) even for large n . The T c is independent of n because the carrier concentration of OP is insensitive to n for large n .