ISSN:
1572-9605
Keywords:
YBa2(Cu1−x Zn x )3O7−y
;
electrical resistivity
;
specific heat
;
magnetic susceptibility
;
electron paramagnetic resonance (EPR)
Source:
Springer Online Journal Archives 1860-2000
Topics:
Electrical Engineering, Measurement and Control Technology
,
Physics
Notes:
Abstract The temperature and Zn concentration dependence of the electrical resistivity, specific heat, magnetic susceptibility, and electron paramagnetic resonance (EPR) spectra of YBa2(Cu1−x Zn x )3O7−y withy∼0.1 has been measured forx≤0.16. In addition, the temperature and field dependence of the magnetization has been measured for 2〈T〈300K and 0〈H〈9.0T, along with the temperature and quasihydrostatic pressure dependence of the electrical resistivity for selected samples for 0〈P〈13 GPa. The substitution of Zn for Cu in YBa2Cu3O7−y causes a rapid and nearly linear depression of the superconducting transition temperature,T c , withT c going to 0 K forx≥ 0.10. YBa2(Cu1−x Zn x )3O7−y retains the YBa2Cu3O7-y orthorhombic structure forx≤0.16 for both the superconducting and nonsuperconducting samples. Initially, the unit cell volume increases nearly linearly with Zn content; however, an abrupt change occurs in the vicinityx=0.8–0.10. Forx〈0.10, the temperature dependence of the electrical resistivity,ρ(T), is metallic-like (dρ/dT〉0) andρ increases gradually with increasing Zn content. However, forx≥ 0.10,ρ(T) becomes semiconductor-like, with a very rapid increase of the resistivity with increasingx. The electrical resistivity, magnetic susceptibility, EPR spectra, and specific heat all indicate that thed-holes associated with the Cu ions become localized in the nonsuperconducting phase,x〉-0.10.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00617952
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