<i>Q</i>-dependence of the spin fluctuations in the intermediate valence compound CePd<sub>3</sub>

Fanelli, Victor; Lawrence, J. M.; Goremychkin, E. A.; Osborn, R.; Bauer, E. D.; McClellan, K. J.; Thompson, J. D.; Booth, C. H.; Christianson, A. D.; Riseborough, Peter S.

doi:10.1088/0953-8984/26/22/225602

Cited by 18 publications

(37 citation statements)

References 28 publications

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“…Various heavy fermion and Kondo insulator systems feature quasielastic paramagnetic scattering, albeit with widely-varying material-dependent reciprocal-space structure, and energy and temperature scales [60][61][62][63][64][65][66] . More generally, calculations show that the intensity of the magnetic scattering due to a hybridized band structure is strongest at the BZ boundaries 61,67 , which has been confirmed in some intermediate valent materials 61,65,68,69 . At the heart of the effect are strong interband transitions across an indirect hybridization gap, from the valence band maximum at the BZ edge to the conduction band minimum located at the BZ center of, for example, the archetypal hybridized bands…”

Section: Relation To Electronic Structurementioning

confidence: 69%

Symmetry and correlations underlying hidden order inURu2Si2

et al. 2015

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Section: Relation To Electronic Structurementioning

confidence: 69%

Symmetry and correlations underlying hidden order inURu2Si2

et al. 2015

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“…In the case of the latter, the system is described by the Anderson lattice model and at low temperatures, renormalized bands with a hybridization gap and large effective masses are expected to emerge. A Q dependence of the magnetic scattering would be strong evidence for coherent behavior, as observed in CePd 3 [24]. It would therefore be interesting to study the INS response of single crystals of CeRuSi 3 and to compare the results to both the Anderson impurity and Anderson lattice models.…”

Section: Discussionmentioning

confidence: 95%

Evidence for a hybridization gap in noncentrosymmetricCeRuSi3

et al. 2015

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Inelastic neutron scattering (INS) and specific heat measurements have been performed on the intermediate valence compound CeRuSi 3 , which is isostructural to the noncentrosymmetric pressure-induced superconductors CeRhSi 3 , CeIrSi 3 , and CeCoGe 3 . INS measurements at 7 K reveal a broad peak at (58.5 ± 1.4) meV, while at 300 K, broad quasielastic scattering is observed. This indicates a large Kondo temperature of T K ∼ 680 K. The magnetic contribution to the specific heat (C mag ) has a value of γ = 62.5(1) mJ/mol K 2 at low temperatures and above about 100 K can be well accounted for by the Coqblin-Schrieffer model with a characteristic temperature of T 0 = 680 K, which is further evidence that CeRuSi 3 is in the intermediate valence regime.

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“…Notably, a significant Kondo interaction may also provide an alternative explanation for the observed spin gap that does not rely on the existence of magnetic anisotropy. For temperatures smaller than the Kondo temperature it is well-known from neutron spectroscopy experiments on intermediate valence compounds [11][12][13] that the Kondo interaction gaps out low energy spin fluctuations. For this scenario, the size of the observed gap is directly determined by the Kondo temperature 6 .…”

Section: Introductionmentioning

confidence: 99%

Low temperature magnetic structure of CeRhIn₅by neutron diffraction on absorption-optimized samples

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Bauer

Thompson

et al. 2017

J. Phys.: Condens. Matter

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Abstract. Two aspects of the ambient pressure magnetic structure of heavy fermion material CeRhIn 5 have remained under some debate since its discovery: whether the structure is indeed an incommensurate helix or a spin density wave, and what is the precise magnitude of the ordered magnetic moment. By using a single crystal sample optimized for hot neutrons to minimize neutron absorption by Rh and In, here we report an ordered moment of = 0.54(2) + . In addition, by using spherical neutron polarimetry measurements on a similar single crystal sample, we have confirmed the helical nature of the magnetic structure, and identified a single chiral domain. IntroductionThe Doniach phase diagram explores a competition in energy scales common to heavy fermion materials, between the Ruderman-Kittel-Kasuya-Yosida (RKKY) and Kondo interactions, which scale as ~. and ~0 1/3 , respectively, where J is the dimensionless Kondo coupling constant [1]. On one side of the phase diagram exists localized magnetism due to RKKY and on the other a totally Kondo-quenched paramagnetic state. Perhaps the most interesting scenarios are those in the middle of the phase diagram where the Kondo and RKKY energy scales are comparable. To find systems of this nature it is imperative to accurately measure these energy scales. CeRhIn 5 is one such system where these scales are believed to be competing.The temperature-pressure phase diagram of CeRhIn 5 is prototypical for heavy fermion materials; at ambient pressure, it displays incommensurate antiferromagnetic (AFM) order below T N = 3.8 K, and with increasing applied pressure T N is suppressed to a quantum critical point at P c = 2.25 GPa around which a broad dome of unconventional superconductivity emerges [2][3][4][5]. In detail, however, the properties of the AFM ground state in CeRhIn 5 deviate from prototypical behavior. Namely, the ground state magnetic order was reported to be helical, rather than spin-density-wave-type (SDW) by neutron measurements [2] and was later confirmed by 115 In NQR measurements [6,7]. Notably, the Ce magnetic moments were found to lie in the tetragonal ab-plane with the helix propagating along c [8]. Recent neutron spectroscopy measurements observed a small energy gap Δ = 0.25 meV in the spin wave spectra of the AFM state [9], but in the absence of magnetic anisotropies in the plane containing the spiraling spins a gapless Goldstone mode is expected for an incommensurate helical magnetic structure. Although an in-plane interaction invariant under the C 4 symmetry of the tetragonal structure may be possible, the gapless Goldstone mode is protected by translational symmetry of the magnetic helix along c. In principle, a sufficiently strong C 4 magnetic anisotropy (comparable to the exchange interactions along c), would distort the magnetic helix and break the associated translational symmetry, resulting in the formation of a spin gap. However, distortion of the helix would also lead to higher harmonic diffraction peaks, which have never been

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Q-dependence of the spin fluctuations in the intermediate valence compound CePd₃

Cited by 18 publications

References 28 publications

Symmetry and correlations underlying hidden order inURu2Si2

Symmetry and correlations underlying hidden order inURu2Si2

Evidence for a hybridization gap in noncentrosymmetricCeRuSi3

Low temperature magnetic structure of CeRhIn₅by neutron diffraction on absorption-optimized samples

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Q-dependence of the spin fluctuations in the intermediate valence compound CePd3

Cited by 18 publications

References 28 publications

Symmetry and correlations underlying hidden order inURu2Si2

Symmetry and correlations underlying hidden order inURu2Si2

Evidence for a hybridization gap in noncentrosymmetricCeRuSi3

Low temperature magnetic structure of CeRhIn5by neutron diffraction on absorption-optimized samples

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Product

Resources

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Q-dependence of the spin fluctuations in the intermediate valence compound CePd₃

Low temperature magnetic structure of CeRhIn₅by neutron diffraction on absorption-optimized samples