Superconducting State Properties of CuBa2Ca3Cu4O10+δ

Abstract

The superconducting state properties of the CuBa2Ca3Cu4O10+δ (Cu-1234) system, with a transition temperature as high as 117.5 K, were investigated. The ac magnetic susceptibility measurements confirmed a very sharp transition to the superconducting state. The upper critical field, Hc2, as high as 91 T, and the irreversibility field, Hirr, as high as 21 T at 77 K, were determined using dc SQUID magnetization measurements. The intragrain critical current density, jc, estimated from a magnetic hysteresis loop, is as high as 5 × 109 A/m2 in a self-generated magnetic field at 77 K. However, the intergrain critical current density in the studied material is smaller by four orders of magnitude due to very weak intergrain connections.

Design and Numerical Study of Magnetic Energy Storage in Toroidal Superconducting Magnets Made of YBCO and BSCCO

“…The graph from Figure 11 shows this variation. A 13% higher value was obtained for the stored energy for the most compact torus, which is in good agreement with results from the literature [14].…”

“…The superconducting critical temperature is about 6.1 K under normal conditions, which is found to be very sensitive to stress. Subjected to a small compressive strain of 1.08%, the superconducting critical temperature increases to 9.3 K. In [14] an intensive studied type II cuprate superconducting is described. It is the high-pressure and high-temperature synthesized CuBa 2 Ca 3 Cu 4 O 10+δ (Cu-1234) that has a relatively high superconducting transition temperature Tc of about 116 K at the ambient pressure, low crystallographic anisotropy and absence of toxic elements.…”

AC Magnetic Susceptibility: Mathematical Modeling and Experimental Realization on Poly-Crystalline and Single-Crystalline High-Tc Superconductors YBa2Cu3O7−δ and Bi2−xPbxSr2Ca2Cu3O10+y

“…The most popular ones are based on the coaxial adjustment of one, two and four PUCs, in the so-called zeroth-, first-and second-derivative configuration [3][4][5][6][7][8]. Due to the flexibility in the choice of PUC configuration and the relatively low-cost realization, ACMS is surely one of the most popular among the plethora of important experimental techniques used to assess the properties of magnetic [9][10][11][12][13] and superconducting [14][15][16][17][18][19][20][21] materials from room temperature down to cryogenic conditions [1]. Also, referring to dynamic phenomena, due to its inherent versatility in the frequency domain (from Hz to tens of kHz), ACMS is the technique of choice in many areas of physics and materials science used to investigate out-of-equilibrium processes such as domain wall motion and domain reversal in ferromagnets [9,10], and flux flow and creep/depinning of vortices in superconductors [1,14,16,20,21].…”