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Local structure studies of the underdoped-overdoped transition in YBa_2Cu_3O_x. Measurement of the yttrium y-ray absorption fine structure | | J. Röhler
; P. W. Loeffen
; S. Müllender
; K. Conder
; E. Kaldis
; | | Date: |
29 Dec 1996 | | Subject: | Superconductivity | cond-mat.supr-con | | Affiliation: | 1 and 2), P. W. Loeffen , S. Müllender , K. Conder , E. Kaldis ( U Köln, ESRF, ETH Zürich | | Abstract: | We have measured the extended x-ray absorption-fine-structure (EXAFS) at the Y-K edge of YBa_2Cu_3O_x for x=6.801, 6.947, 6.968, 6.984 at T=20-300 K. Across the underdoped-overdoped transition the Y-Cu2 pairs exhibit harmonic vibrations which freeze out in the superconducting phase, whereas the Y-O2,3 pairs exhibit strong anharmonicities with a singularity at T_c. In the underdoped regime the average spacing O2,3-Cu2 increases with x due to displacements of Cu2 towards Ba, but the average position of O2,3 along c is almost unaffected. Optimum doping is a notable point in the x-T phase diagram, also concerning the lattice degrees of freedom. Here the O2,3-Cu2 spacing (buckling) is largest, and in the superconducting phase the Cu2 position along the c-axis is independent on temperature. In the overdoped regime increasing x displaces the Cu2 along c further towards Ba, but the O2,3 layer starts to shift in the same direction, thus decreasing the O2,3-Cu2 spacing. | | Source: | arXiv, cond-mat/9701208 | | Services: | Forum | Review | PDF | Favorites | |
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