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M-E and P-H loops of x = 1.6 sample at 10 K. a M-E loops after + E and + H ab poled or −E and + H ab poled conditions measured at H ab = 0. The inset shows the schematic measurement configuration. b The Δ P-H ab curves measured from state 1 and state 2 in a after + E and + H poled condition
