Specific-heat exponent and critical-amplitude ratio at the Lifshitz multicritical point

The specific-heat critical exponent, αL, associated with the uniaxial Ising-type Lifshitz point (LP) in MnP, was determined experimentally from the study of the magnetic susceptibility, {χ}, perpendicular to the easy axis, as a function of the magnetic field. According to generalized scaling theory, the divergence of {χ}, at the ferromagnetic-paramagnetic phase boundary, near the LP, is governed by {α}. We found αL between 0.4 and 0.5, in agreement with estimates from other experimentally known critical exponents in MnP. For the critical-amplitude ratio we found A⁺/A^-=0.65±{}0.05. .AE