Switching of Magnetic Ordering in CeRhIn<sub>5</sub>under Hydrostatic Pressure

Aso, Naofumi; Ishii, Kiwamu; Yoshizawa, H.; Fujiwara, T.; Uwatoko, Yoshiya; Chen, Genfu; Sato, Noriaki; Miyake, Kazumasa

doi:10.1143/jpsj.78.073703

Cited by 34 publications

(45 citation statements)

References 16 publications

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“…Two points are noteworthy; (i) the measurements reported in Ref. [19,21] were carried out in pressure cells, which typically reduces the signal-to-noise ratio, making an accurate determination of the size of magnetic moments more difficult, and (ii) measurements performed with longer wavelengths seem to report larger magnetic moments. Extinction effects, which decrease the intensity of strong nuclear peaks and thus overestimate the magnetic moment, explain the latter point; as described above, extinction effects are significantly worse for longer wavelengths.…”

Section: Resultsmentioning

confidence: 99%

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

Fobes

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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Section: Resultsmentioning

confidence: 99%

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

Fobes

Bauer

Thompson

et al. 2017

J. Phys.: Condens. Matter

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“…4(b), suggest a possible origin for this difference. 66) On cooling initially below T N , magnetic scattering intensity appears at Q1, which is associated with the propagation wavevector at ambient pressure, but with further cooling, intensity at Q1 begins to decrease and scattering grows at a slightly different Q2. The temperature at which scattering …”

Section: Cerhinmentioning

confidence: 97%

“…67) Thus, a more realistic interpretation of the magnetism in CeRhIn 5 is that it arises from ''nearly localized'' 4f electrons that hybridize weakly with p,d band electrons to give a density of states at the Fermi energy with some 4f character. With applied pressure, the ordered moment decreases by $25% as the critical pressure P1 is approached, 66) implying additional band mixing. At a higher pressure of $2:3 GPa, de Haas-van Alphen frequencies jump sharply to larger values and the mass of electrons diverges.…”

Section: -4mentioning

confidence: 99%

Progress in Heavy-Fermion Superconductivity: Ce115 and Related Materials

2012

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Ce115 and related Ce compounds are particularly suited to detailed studies of the interplay of antiferromagnetic order, unconventional superconductivity and quantum criticality due to their availability as high quality single crystals and their tunability by chemistry, pressure and magnetic field. Neutron-scattering, NMR and angle-resolved thermodynamic measurements have deepened the understanding of this interplay. Very low temperature experiments in pure and lightly doped CeCoIn 5 have elaborated the FFLO-like magnetic state near the field-induced quantum-critical point. New, related superconducting materials have broadened the phase space for discovering underlying principles of heavy-fermion superconductivity and its relationship to nearby states.

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“…pressure and low temperature preclude to perform neutron diffraction experiments, which were carried out either under pressure [8,9] or under magnetic field [10]. Another possible route is to substitute Sn for In, which acts as a positive pressure in the the phase diagram.…”

Section: Pacs Numbersmentioning

confidence: 99%

Switching of the magnetic order inCeRhIn5−xSnxin the vicinity of its quantum critical point

et al. 2014

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We report neutron diffraction experiments performed in the tetragonal antiferromagnetic heavy fermion system CeRhIn5−xSnx in its (x, T ) phase diagram up to the vicinity of the critical concentration xc ≈ 0.40, where long range magnetic order is suppressed. The propagation vector of the magnetic structure is found to be kIC=(1/2, 1/2, k l ) with k l increasing from k l =0.298 to k l =0.410 when x increases from x=0 to x=0.26. Surprisingly, for x=0.30, the order has changed drastically and a commensurate antiferromagnetism with kC=(1/2, 1/2, 0) is found. This concentration is located in the proximity of the quantum critical point where superconductivity is expected.

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Switching of Magnetic Ordering in CeRhIn₅under Hydrostatic Pressure

Cited by 34 publications

References 16 publications

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

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

Progress in Heavy-Fermion Superconductivity: Ce115 and Related Materials

Switching of the magnetic order inCeRhIn5−xSnxin the vicinity of its quantum critical point

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Switching of Magnetic Ordering in CeRhIn5under Hydrostatic Pressure

Cited by 34 publications

References 16 publications

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

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

Progress in Heavy-Fermion Superconductivity: Ce115 and Related Materials

Switching of the magnetic order inCeRhIn5−xSnxin the vicinity of its quantum critical point

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Product

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Switching of Magnetic Ordering in CeRhIn₅under Hydrostatic Pressure

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

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