Microscopic Theory of Magnetic Phase Transitions in HoNi_2B_2C

Details Microscopic Theory of Magnetic Phase Transitions in HoNi_2B_2C Microscopic Theory of Magnetic Phase Transitions in HoNi_2B_2C

1997-06-26

arxiv.org/abs/cond-mat/9706268v3

Phys. Rev. B 57, 10684 (1998)

Physics

Condensed Matter

Strongly Correlated Electrons

REVTex, 13 pages, 2 figures included. Published version, widely rewritten

Scientific paper

10.1103/PhysRevB.57.10684

We present a microscopic theory for the low temperature metamagnetic phase diagram of HoNi_2B_2C 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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