A.C. magnetization characteristics of Nd123 bulk superconductors

✍ Scribed by K. Waki; T. Higuchi; S.I. Yoo; M. Watahiki; N. Hayashi; N. Sakai; N. Chikumoto; M. Murakami

• Publisher: Elsevier Science
• Year: 1997
• Tongue: English
• Weight: 527 KB
• Volume: 37
• Category: Article
• ISSN: 0011-2275
• DOI: 10.1016/s0011-2275(97)00063-5

✦ Synopsis

The a.c. magnetization characteristics of NdBa$&O, (Ndl23) bulk superconductors were investigated using a.c. susceptometry. For the present study, an OCMG-processed Nd123 bulk sample (OCMG-Nd123; T, = 93.9 K) and a flux-grown Nd123 single crystal (Ndl23SC; T, = 93.2 K) were used. An MPMG-processed Y123 bulk sample (MPMG-Y123; T, = 91.6 K) was also studied for comparison. While the fundamental responses are basically the same for all samples, the third harmonic responses by sweeping the bias field, x3(&), show an interesting feature in that the x3(Hdc) curves for Nd123 samples indirectly reflect the fishtail peak of their d.c. magnetization hysteresis (M-H) curves. The boundary lines of Nd123 samples, determined from both the peak temperature (TJ of the ,Y,"( 7-I maxima and the offset of the x3(&), are commonly located at higher field-temperature region relative to that of the Y123. Using the scaling relationship of /-/x(1 -t)", where t = TIT,, all the boundary lines from the x3(/-&) and the x,"( T) maxima could be best fit with a power n of -1.2 and -1.4, respectively.