Li4CuSbO5.5 (39.7 mg) powder was sealed inside a high purity quartz tube (Suprasil medium wall EPR tubes, Goss Scientific). 
Magnetic measurements were carried out using a SQUID magnetometer MPMS3 from Quantum Design. 
Data were collected over the temperature range 2-300 K with applied fields of 40 and 60 kOe as indicated in the filename. 
M(H) data were collected at 2, 10, 50 and 300 K as indicated by the filename. 
Each datafile contains file headers.