Neutron depolarization measurements on HgCr₂Se₄ under pressure

Abstract:

To probe the dependence of the magnetic interactions on structure and atomic distances, the pressure dependent magnetic phase diagram of chromium spinel HgCr₂Se₄ was investigated. The pressure was applied with purposely built diamond anvil cells. The magnetic state of the samples was probed by neutron depolarization, where a pair of focusing neutron supermirror guides was used, increasing the signal intensity by a factor 20. Given the strong competition between FM and AFM exchange in HgCr₂Se₄ and parent compounds, the different ground states and physical phenomena observed are likely a consequence of complex coupling of structural distortions with the magnetic degrees of freedom.

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