What material properties need to be specified in a thermal-electrical analysis in ABAQUS?

Referring to Section 17.1.3 of the ABAQUS User's manual you will require the heat transfer properties as well as the electrical properties. These are listed below :

• Heat Transfer properties
  • *CONDUCTIVITY
  • *LATENT HEAT
  • *SPECIFIC HEAT
  • *HEAT GENERATION
• Electrical properties
  • *DIELECTRIC
  • *ELECTRICAL CONDUCTIVITY
  • *JOULE HEAT FRACTION
  • *PIEZOELECTRIC

This forms the complete set of properties. If Piezoelectric elements are not used then *PIEZOELECTRIC and *DIELECTRIC properties will not be required. 
If only the steady state heat transfer response is of interest then *SPECIFIC HEAT properties are not required. Similarly if there are no phase changes involved then *LATENT HEAT is not required. 
*JOULE HEAT FRACTION is used to specify the fraction of electrical energy that will be released as heat. 
Example problem 5.2.1 - thermal-electrical modelling of an automotive fuse illustrates the thermal-electrical analysis. 
ABAQUS allows for redundant material properties to be specified. It will simply ignore the material properties not required for the current analysis. 
Typical example of material properties : 

*MATERIAL, NAME=ZINC
*CONDUCTIVITY
 0.1121,  20.0
 0.1103, 100.0
*ELECTRICAL CONDUCTIVITY
 16.75E3,  20.0
 12.92E3, 100.0
*JOULE HEAT FRACTION
  1.0
*DENSITY
  7.14E-6
*SPECIFIC HEAT
  389.0