Y1Ba2Cu3O7−x sintered samples have been investigated near the transition temperature by means of AC susceptibility technique. In particular, the intragranular contribution to the imaginary part of susceptibility (χ″) has been studied as a function of the field frequency (f = 17 Hz to 1070 Hz) in a narrow temperature range (few degrees) around Tc (≅92.0 K). Different frequency dependences of χ″ have been found as the temperature varies. For temperatures T<91.9 K χ″ is found to increase linearly with ln f, whereas for T≥ 91.9 K a linear frequency dependence is found. Moreover, for T<92.3K the zero frequency limit approaches to a finite value, whereas for T > 92.3K such limit is zero.
AC susceptibility study of YBCO sintered samples near the transition temperature
POLICHETTI, Massimiliano;PACE, Sandro;I. D'Acunto;
1996-01-01
Abstract
Y1Ba2Cu3O7−x sintered samples have been investigated near the transition temperature by means of AC susceptibility technique. In particular, the intragranular contribution to the imaginary part of susceptibility (χ″) has been studied as a function of the field frequency (f = 17 Hz to 1070 Hz) in a narrow temperature range (few degrees) around Tc (≅92.0 K). Different frequency dependences of χ″ have been found as the temperature varies. For temperatures T<91.9 K χ″ is found to increase linearly with ln f, whereas for T≥ 91.9 K a linear frequency dependence is found. Moreover, for T<92.3K the zero frequency limit approaches to a finite value, whereas for T > 92.3K such limit is zero.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
