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arXiv · 1408.6585

The magnitude of the magnetic exchange interaction in the heavy fermion antiferromagnet CeRhIn$_5$

Pinaki Das·S. -Z. Lin·N. J. Ghimire·K. Huang·F. Ronning·E. D. Bauer·J. D. Thompson·C. D. Batista·G. Ehlers·M. Janoschek
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Abstract

We have used high-resolution neutron spectroscopy experiments to determine the complete spin wave spectrum of the heavy fermion antiferromagnet CeRhIn$_5$. The spin wave dispersion can be quantitatively reproduced with a simple $J_1$-$J_2$ model that also naturally explains the magnetic spin-spiral ground state of CeRhIn$_5$ and yields a dominant in-plane nearest-neighbor magnetic exchange constant $J_0$ = 0.74 meV. Our results pave the way to a quantitative understanding of the rich low-temperature phase diagram of the prominent Ce$T$In$_5$ ($T$ = Co, Rh, Ir) class of heavy fermion materials.

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Pinaki Das, S. -Z. Lin, N. J. Ghimire, K. Huang, F. Ronning, E. D. Bauer, J. D. Thompson, C. D. Batista, G. Ehlers, M. Janoschek. 2014-08-27. The magnitude of the magnetic exchange interaction in the heavy fermion antiferromagnet CeRhIn$_5$. https://doi.org/10.1103/physrevlett.113.246403

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