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(a) Crystal structure (-plane) of . The induced and spin-helicity vector in the -CS (b) and -CS (c) states. Experimentally obtained phase diagrams for (d) , (e) , and (f) are reproduced from Ref. 16.
(a) Calculated phase diagram of . Here, the high-temperature PM phase is denoted by PM, accompanied by the paraelectric phase PE, CS order denotes cycloidal spin order, sc-AFM stands for sinusoidal collinear antiferromagnetic order. Specific heat and spin-helicity vector as a function of under various : (b) , and (c) .
(a) Calculated phase diagram. Specific heat and spin-helicity vector as a function of under: (b) , (c) , and (d) .
Calculated spin-helicity correlation functions (a) and (b) under at .
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