Low temperature magnetoelectric effects on Co3B7O13I

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Abstract
A linear and a quadratic magnetoelectric effect have been detected in cobalt-iodine boracite (Co3B7O13I). Second order αB32 (linear effect) and third order β311 and β322 (quadratic effect) magnetoelectric coefficients have been measured versus temperature from 4 K to 70 K. The values of the coefficients obtained at 4 K are: α32 = 4.17 × 10−11 s.m−1, β311 = -3.0 × 10−48 s.A−1, β322 = -1.9 × 10−18 s.A−1 and β333 = -1.7 × 10−19 s.A−1.