Microscopic Theory of Magnetic Phase Transitions in HoNi2B2C
Abstract
We present a microscopic theory for the low temperature metamagnetic phase diagram of HoNi2B2C that agrees well with experiments.For the same model we determined the zero field ground state as a function of temperature and find the c-axis commensurate to incommensurate transition in the expected temperature range. The complex behaviour of the system originates from the competition between the crystalline electric field and the Ruderman-Kittel-Kasuya-Yosida interaction, whose effective form is obtained. No essential influence of superconductivity has to be invoked to understand the magnetic phase diagram of this material.
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