Intrinsic electronic superconducting phases at 60 K and 90 K in double-layer Yba_2Cu_3O<6+δ>
著者
本間, 龍也
(Honma, Tatsuya)
Hor, PH
上位タイトル
Physical Review B
Vol.75,
No.1
(2007.
)
,p.012508-1-
012508-4
識別番号
ISSN
1098-0121
抄録
We study superconducting transition temperature (T_c) of oxygen-doped double-layer high-temperature superconductors YBa_2Cu_3O<6+δ> (0≤δ≤1) as a function of the oxygen dopant concentration (δ) and planar hole-doping concentration (P_<pl>). We find that T_c, while clearly influenced by the development of the chain ordering as seen in the T_c vs plot, lies on a universal curve originating at the critical hole concentration (P_c)=1/16 in the T_c vs P_<pl> plot. Our analysis suggests that the universal behavior of T_c(P_<pl>) can be understood in terms of the competition and collaboration of chemical phases and electronic phases that exist in the system. We conclude that the global superconductivity behavior of Yba_2Cu_3O<6+δ> as a function of doping is electronically driven and dictated by pristine electronic phases at magic doping numbers that follow the hierarchical order based on P_c, such as 2×P_c, 3×P_c, and 4×P_c. We find that there are at least two intrinsic electronic superconducting phases of T_c=60 K at 2×P_c=1/8 and T_c=90 K at 3×P_c=3/16.
注記
Honma, T. ; Hor, P. H., Physical Review B, 75-1, 012508, 2007. "Copyright (2007) by the American Physical Society."
