Soft-x-ray absorption spectroscopy of heterostructured high-Tc superconducting nanohybrids: X−Bi2Sr2CaCu2O8 [X=I, HgI2, and (Py−CH3)2HgI4]

J. M. Chen; S. C. Chang; R. S. Liu; J. M. Lee; M. Park; J. H. Choy

doi:10.1103/PhysRevB.71.094501

← Back to search

Soft-x-ray absorption spectroscopy of heterostructured high-Tc superconducting nanohybrids: X−Bi2Sr2CaCu2O8 [X=I, HgI2, and (Py−CH3)2HgI4]

J. M. Chen, S. C. Chang, R. S. Liu, J. M. Lee, M. Park, J. H. Choy

DOI 10.1103/PhysRevB.71.094501 · Physical Review B

T1

Active bibliographic source — not scientific approval

Bibliographic access preserves source history; it does not approve extracted materials or validate reported claims. Review warnings on each occurrence separately.

Abstract

Unoccupied electronic states of X−Bi2Sr2CaCu2O8 [X-Bi2212, X=I, HgI2, and (Py−CH3)2−HgI4, Py=pyridine] have been probed by O K-edge and Cu L-edge x-ray absorption near-edge structure (XANES) spectra using a bulk-sensitive x-ray-fluorescence-yield technique. In the O 1s absorption edge of X-Bi2212, the pre-edge feature at ∼528.3eV is attributed to transitions into O 2p hole states located in the CuO2 planes. As deduced from O K-edge and Cu L-edge x-ray absorption spectra, the hole concentration in the CuO2 planes of X-Bi2212 increases for X=I and HgI2, but decreases for X=(Py−CH3)2HgI4, relative to pristine Bi2212. The present XANES results clearly demonstrate that the hole density within the CuO2 planes of intercalated Bi2Sr2CaCu2O8 can be not only decreased but also increased, depending on the chemical character of the intercalants.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
Bi2Sr2CaCu2O8 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown
La2CuO4-δFy Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown
Sr2CuO2F2+δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown
HgBa2Sr2Cu2(CO3)O7 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown
(Hg0.3Pb0.7)Sr4Cu2(CO3)O7 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown
(Tl0.5Pb0.5)Sr4Cu2(CO3)O7 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown
(Bi0.5Hg0.5)Sr4Cu2(CO3)O7 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown