Polarized X-Ray Absorption Spectroscopic Study on Mercuric Bromide Intercalated Bi2Sr2CaCu2O Single Crystal

Strong Electronic Consequences of Intercalation in Cuprate Superconductors: The Case of a Trigonal Planar AuI3 Complex Stabilized in the Bi2Sr2CaCu2Oy Lattice

“…In isolated [Bi(OH) 2 O] - , the charge of O ax is −1.67; it increases to −1.64 upon the interaction with [Cu(OH) 4 ] 2- and then increases further to −1.56 upon the subsequent interaction with AuI 3 . Our findings are in agreement with the results of XANES spectroscopic studies on Bi2212; these revealed partial oxidations of BiO and CuO 2 layers upon Ag x I w and HgX 2 intercalation. ,, More importantly, considering that all Bi2212 samples in ref were in the slightly overdoped region of the phase diagram, our results are fully consistent with a decrease in T c upon the intercalation. , …”

“…During the past decade, the intercalation technique has been effectively applied to the Bi 2 Sr 2 CaCu 2 O y superconductor (Bi2212), extending the scope of high-T c superconductivity (HTCS) in layered cuprates. [1][2][3][4][5][6] As part of this effort, recently, a molecular AuI 3 complex was stabilized in the interlayer space of the Bi2212 lattice by Choy et al 7 Using several spectroscopic techniques, Choy et al concluded that a trigonal planar (D 3h ) AuI 3 intercalates between the two BiO layers, its plane parallel to the layer interface (see Figure 1).…”

“…During the past decade, the intercalation technique has been effectively applied to the Bi 2 Sr 2 CaCu 2 O y superconductor (Bi2212), extending the scope of high- T c superconductivity (HTCS) in layered cuprates. − …”

Evidence of Two-Dimensional Superconductivity in the Single Crystalline Nanohybrid of Organic-Bismuth Cuprate

“…E//c spectra corresponding to the transitions from 1s to out-ofplane 4p π orbitals appear at lower energies than those in the E⊥c spectra originating from the transition from 1s to in-plane 4p σ orbitals. 16 Such a remarkable angle dependence of spectral features is clearly discernible not only for the pristine Bi2212 but also for all the intercalation compounds including the organomercury intercalate. The observation of the distinct angle dependence of Cu K-edge XANES spectra can be regarded as strong evidence on the maintenance of single crystalline nature after the intercalation.…”

“…Figure represents the Cu K-edge XANES spectra of the pristine Bi2212, I−Bi2212, HgI 2 −Bi2212, and HgI 2 Py 2 −Bi2212 single crystals with polarization angles of 10° ( E // c , E : electric field of polarized X-ray) and 90° ( E ⊥ c ). Since a significant structural deformation around copper in the bismuth cuprate lifts the degeneracy of Cu 4p π and 4p σ orbitals, fine features in the E // c spectra corresponding to the transitions from 1s to out-of-plane 4p π orbitals appear at lower energies than those in the E ⊥ c spectra originating from the transition from 1s to in-plane 4p σ orbitals . Such a remarkable angle dependence of spectral features is clearly discernible not only for the pristine Bi2212 but also for all the intercalation compounds including the organomercury intercalate.…”