Critical magnetic fields

Three important characteristics of the superconducting state are the critical temperature, the critical magnetic field, and the critical current. These parameters can be varied by using different materials or giving them special metallurgical treatments. 

Superconductivity exists within the boundaries of three limiting parameters which must not be exceeded the critical temperature (T ), the critical magnetic field (H ) and the critical current demsity (J ). 

Transition temperature in Kelvin, critical magnetic field in gauss (1CT4T). 

Thermodynamic calculations, 14 86t Thermodynamic critical magnetic fields, 23 809-811... 

Hc2- k-(ET)2Cu(NCS)2 gave higher upper critical magnetic field H 2 values in the two-dimensional plane than the Pauli limited magnetic field //pauii [226, 227]. 

In Table 3, some data for a family of the most promising A-15 type materials are presented with their critical magnetic fields, and the derivative of critical field with respect to transition temperature (all about 2.5 in value). These data were reported by Hulm and... 

Figure 6.10 Temperature dependence of critical magnetic field for a superconductor. Reprinted, by permission, from L. Solymar and D. Walsh, Lectures on the Electrical Properties of Materials, 5th ed., p. 429. Copyright 1993 by Oxford University Press.

Table 6.1 Critical Temperature and Critical Magnetic Field of a Number of Superconducting Elements...

Figure 13.17 (a) Typical graph of critical magnetic field 3Cc as a function of temperature for a type I superconductor. Magnetic fields greater than 3tc suppress the superconducting transition, (b) Critical magnetic fields for several type I superconductors. 

Her critical magnetic field compound to indicate that die composition is... 

Xiang Y., Lin Z. Y., Li T., Shi J., Huang J. W. and Ji L. N., A homeotropical Alignment Nematic Liquid Crystal Doped with FeTPPCl will Dramatically Decrease the Critical Magnetic Field for the Bend Reorientation in a Static Magnetic Field. Mol. Cryst. Liq. Cryst. 339 (2000) pp. 139-143. 

Superconductivity is the absence of resistance to dc conduction this occurs only below a critical temperature Tc, a critical magnetic field (which is a function of T and current density j), and a critical current density j, which is a function of T and H. For alloys, does not exceed 23 -24 K (by contrast, some of the recently discovered ceramic high-Tc cuprate superconductors, such as HgBa2Ca2Cu30j , have Tc values as high as 140 K and can have comparable y c values), Designers of superconducting solenoid magnets... 

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