Rietveld analysis of Tl2Ba2Can−1CunO4+2n (n=1, 2 and 3) by powder x-ray diffraction

Shimakawa, Yuichi; Kubo, Yoshimi; Manako, T.; Nakabayashi, Yukinobu; Igarashi, H.

doi:10.1016/0921-4534(88)90111-6

Cited by 91 publications

(15 citation statements)

References 15 publications

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“…Let us compare the calculated results with experiment. The diffraction studies of Tl 2 Ba 2 CaCu 2 O 8 suggested the substitution of Ca for Tl [2][3][4]11]. The calculated energetics of possible antisite substitutions is in agreement with this result.…”

Section: Resultssupporting

confidence: 73%

“…The authors of this paper showed that the force model provided a stable lattice dynamics and satisfactory agreement with some experimental phonon properties. We performed the relaxation of the perfect model crystallite and compared the final positions of the ions in the unit cell with the experimental ones [11]. The largest deviation from the experimental data is less than 0.3 Å.…”

Section: Theoretical Methodsmentioning

confidence: 99%

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Computer simulation of point defects and oxygen migration in

Moseev¹

1998

Modelling Simul. Mater. Sci. Eng.

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Section: Resultssupporting

confidence: 73%

Section: Theoretical Methodsmentioning

confidence: 99%

Computer simulation of point defects and oxygen migration in

Moseev¹

1998

Modelling Simul. Mater. Sci. Eng.

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“…Figure 6 shows the crystal structure of Tl-2201 such as reported in Ref. [63]. The simplest way to explore the possible consequences of our hypothesis consists in dividing the structure into regions A and B (denoted in Fig.…”

Section: Possible Extension Of the Ilt Scenario For Single Layer Comp...mentioning

confidence: 97%

Correlation between the Josephson coupling energy and the condensation energy in bilayer cuprate superconductors

et al. 2001

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We review some previous studies concerning the intra-bilayer Josephson plasmons and present new ellipsometric data of the c-axis infrared response of almost optimally doped Bi2Sr2CaCu2O8. The c-axis conductivity of this compound exhibits the same kind of anomalies as that of underdoped YBa2Cu3O 7−δ . We analyze these anomalies in detail and show that they can be explained within a model involving the intra-bilayer Josephson effect and variations of the electric field inside the unit cell. The Josephson coupling energies of different bilayer compounds obtained from the optical data are compared with the condensation energies and it is shown that there is a reasonable agreement between the values of the two quantities. We argue that the Josephson coupling energy, as determined by the frequency of the intra-bilayer Josephson plasmon, represents a reasonable estimate of the change of the effective c-axis kinetic energy upon entering the superconducting state. It is further explained that this is not the case for the estimate based on the use of the simplest "tight-binding" sum rule. We discuss possible interpretations of the remarkable agreement between the Josephson coupling energies and the condensation energies. The most plausible interpretation is that the interlayer tunneling of the Cooper pairs provides the dominant contribution to the condensation energy of the bilayer compounds; in other words that the condensation energy of these compounds can be accounted for by the interlayer tunneling theory. We suggest an extension of this theory, which may also explain the high values of Tc in the single layer compounds Tl2Ba2CuO6 and HgBa2CuO4, and we make several experimentally verifiable predictions. determines U 0 . Van der Marel and Tsvetkov [12] proposed a phenomenological model of the dielectric response of such a superlattice of inter-bilayer and intra-bilayer Josephson junctions. They showed that it exhibits a transverse resonance between the two zero crossings corresponding to the two plasmons. It has been suggested [13] that this new excitation ("transverse plasma excitation"), which can be visualized as a resonant oscillation of the condensate density between the two closely spaced copper-oxygen planes, has indeed been observed as an additional absorption peak which appears at low temperature in the spectra of the infrared c-axis conductivity of underdoped Y123 [14,15,16,17]. Very recently, this interpretation has been put on a firm basis by a detailed analysis of the c-axis conductivity data for Y123 with different oxygen concentrations [18,19]. Note that the observation of the transverse plasma excitation also implies the existence of the second (intra-bilayer) Josephson plasmon which is a vital ingredient of the ILT theory. This opens a possibility to test also for bilayer compounds the relationship between the Josephson coupling energy and the condensation energy predicted by the ILT theory (Eq. (1)).In this paper we review some of the previous experimental observations of the transverse plasma excitatio...

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“…The impurity phases were identi"ed by EDS and characteristic XRD peaks to be small amounts of either the lower homologue 2201 (20), Ca CuO (21), Ba CuO (22), or BaCuO (23). The impurities found in the samples, added to the re"nements, are listed in Table 2.…”

Section: X-ray Powder Diwractionmentioning

confidence: 99%