HTS properties

The superior physical and technical properties determine the application of HTS and favour their utilization in electrical or magnetic components. Except of the critical temperature Tc where the material switches into the superconducting state for many applications the critical current density Jc (B,T) and their dependency on the temperature T and on the magnetic flux density B is the most relevant technical parameter. Although the HTS current state-of –the –art is satisfactory in many fields of applications, R&D activities are continually striving to obtain higher Jc values at bulks, thin films and wires.

Jc (T, B)

Fig.:  YBCO critical current density Jc (T, B)

Ref. Kyushu Univ., JP

Table: Material properties of Y1Ba2Cu3O7-δ

Transition temperature Tc

Electrical Resistance ρ300

Density (lattice constants)

Specific heat k300

Heat transfer coefficient  λ

Lin. thermal expansion coeff.

Tensile strength

Critical current density Jc

Critical field HC2 parallel c axis:

HC2 perpend. c axis:

92 K  (-181o C)

0.6 – 0.7 mΩcm

6.38 g/cm³

0.18 Ws/K g

4 W/ K  m

6-12 x 10 -6 / K

25 MPa

105 A/cm² (77 K, 0 T)

8x106 A/cm² (4.2 K, 0 T)

128 T (4.2 K)

240 T (4.2 K)

It should be noticed, that most of the material parameters above show a strong anisotropic behaviour.