Field-induced magnetic transitions in the quasi-two-dimensional heavy-fermion antiferromagnets Ce_{n}RhIn_{3n+2} (n=1 or 2)

A. L. Cornelius; P. G. Pagliuso; M. F. Hundley; J. L. Sarrao

doi:10.1103/PhysRevB.64.144411

paper

Field-induced magnetic transitions in the quasi-two-dimensional heavy-fermion antiferromagnets Ce_{n}RhIn_{3n+2} (n=1 or 2)

arXiv:cond-mat/0104446 · doi:10.1103/PhysRevB.64.144411

Abstract

We have measured the field-dependent heat capacity in the tetragonal antiferromagnets CeRhIn $_{5}$ and Ce $_{2}$ RhIn $_{8}$ , both of which have an enhanced value of the electronic specific heat coefficient $γ \sim 400$ mJ/mol-Ce K $^{2}$ above $T_{N}$ . For $T < T_{N},$ the specific heat data at zero applied magnetic field are consistent with the existence of an anisotropic spin-density wave opening a gap in the Fermi surface for CeRhIn $_{5},$ while Ce $_{2}$ RhIn $_{8}$ shows behavior consistent with a simple antiferromagnetic magnon. From these results, the magnetic structure, in a manner similar to the crystal structure, appears more two-dimensional in CeRhIn $_{5}$ than in Ce $_{2}$ RhIn $_{8}$ where only about 12% of the Fermi surface remains ungapped relative to 92% for Ce $_{2}$ RhIn $_{8}$ . When $B ∣∣ c,$ both compounds behave in a manner expected for heavy fermion systems as both $T_{N}$ and the electronic heat capacity decrease as field is applied. When the field is applied in the tetragonal basal plane ( $B ∣∣ a$ ), CeRhIn $_{5}$ and Ce $_{2}$ RhIn $_{8}$ have very similar phase diagrams which contain both first- and second-order field-induced magnetic transitions .

15 pages, 4 figures

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Magnetic Structure of Heavy Fermion Ce2RhIn8

Field-induced magnetic transitions in the quasi-two-dimensional heavy-fermion antiferromagnets Ce_{n}RhIn_{3n+2} (n=1 or 2)

Abstract

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