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Extra info for BS EN 1015-6:1999: Methods of test for mortar for masonry. Determination of bulk density of fresh mortar

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3 General Optical Properties of Cuprates 27 Beside the observed anomalies on the phonon modes, TJP mode has a complicated behavior. For instance, it has been found that the TJP mode can split in the existence of the phonon modes [50]; some impurity doping such as Zn to Cu sites in the planes can suppress this mode; and in the existence of a magnetic field TJP mode can be suppressed. Moreover, it has been shown that the observed frequency range of the TJP mode is not always the same energy range, but it changes with changing the doping level [48, 51].

2. Instead of using the empirical formula we determined the doping levels of the samples by the literature values [3], which has been evaluated from the relation between the c-axis lattice constant versus oxygen concentration. Since the doping levels do not change with Zn-substitution, we determined the doping level of the Zn-substituted samples based on the Zn-free ones. This determination works well, since we can see a specific behavior in the optical conductivity, that will be explained in later chapters.

B shows the same plot after subtracting the phonon modes. Inset the conductivity at 50 cm−1 normalized with respect to the room temperature conductivity (open circles) together with Knight shift (solid line). Reprinted with permission from Ref. [36]. 3 General Optical Properties of Cuprates 23 Fig. 21 Optical conductivity of underdoped NdBa2 Cu3 O y (T c = 85 K). a High energy transfer with pseudogap opening. b Behavior of the superconducting state (Low energy suppression without high energy transfer).

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