Magnetic order in the 2D Heavy-Fermion system CePt2In7studied byμ+SR

Må̊nsson, Martin; Prša, Krunoslav; Sassa, Yasmine; Tobash, Paul H.; Bauer, E. D.; Rusu, C.; Andreica, Daniel; Tjernberg, Oscar; Sedlák, Kamil; Grioni, M.; Durakiewicz, Tomasz; Sugiyama, Jun

doi:10.1088/1742-6596/551/1/012028

Cited by 10 publications

(9 citation statements)

References 22 publications

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“… SR experiments were in similarity to our previous studies of low-temperature magnetic properties 27 , 44 , 45 performed using a positive surface muon beam line and the GPS spectrometer at the Swiss Muon Source (S S in PSI, Switzerland). The handling of the powder sample ( g) was performed inside a glove-box (controlled He(g) atmosphere) to avoid sample degradation due to mainly humidity.…”

Section: Methodssupporting

confidence: 70%

Magnetism and ion diffusion in honeycomb layered oxide $${\hbox {K}_2\hbox {Ni}_2\hbox {TeO}_6}$$

Matsubara

Nocerino

Forslund

et al. 2020

Sci Rep

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In the quest for developing novel and efficient batteries, a great interest has been raised for sustainable K-based honeycomb layer oxide materials, both for their application in energy devices as well as for their fundamental material properties. A key issue in the realization of efficient batteries based on such compounds, is to understand the K-ion diffusion mechanism. However, investigation of potassium-ion (K$$^+$$ + ) dynamics in materials using e.g. NMR and related techniques has so far been very challenging, due to its inherently weak nuclear magnetic moment, in contrast to other alkali ions such as lithium and sodium. Spin-polarised muons, having a high gyromagnetic ratio, make the muon spin rotation and relaxation ($$\mu ^+$$ μ + SR) technique ideal for probing ions dynamics in these types of energy materials. Here we present a study of the low-temperature magnetic properties as well as K$$^+$$ + dynamics in honeycomb layered oxide material $${\hbox {K}_2\hbox {Ni}_2\hbox {TeO}_6}$$ K 2 Ni 2 TeO 6 using mainly the $$\mu ^+$$ μ + SR technique. Our low-temperature $$\mu ^+$$ μ + SR results together with complementary magnetic susceptibility measurements find an antiferromagnetic transition at $$T_{\mathrm{N}}\approx 27$$ T N ≈ 27 K. Further $${\mu}^{+}$$ μ + SR studies performed at higher temperatures reveal that potassium ions (K$$^+$$ + ) become mobile above 200 K and the activation energy for the diffusion process is obtained as $$E_{\mathrm{a}}=121 (13)$$ E a = 121 ( 13 ) meV. This is the first time that K$$^+$$ + dynamics in potassium-based battery materials has been measured using $$\mu ^+$$ μ + SR. Assisted by high-resolution neutron diffraction, the temperature dependence of the K-ion self diffusion constant is also extracted. Finally our results also reveal that K-ion diffusion occurs predominantly at the surface of the powder particles. This opens future possibilities for potentially improving ion diffusion as well as K-ion battery device performance using nano-structuring and surface coatings of the particles.

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Section: Methodssupporting

confidence: 70%

Magnetism and ion diffusion in honeycomb layered oxide $${\hbox {K}_2\hbox {Ni}_2\hbox {TeO}_6}$$

Matsubara

Nocerino

Forslund

et al. 2020

Sci Rep

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“…Consequently, people tried to seek for higher superconducting transition temperatures in CePt 2 In 7 . Nevertheless, the ground state of CePt 2 In 7 compound was determined to be antiferromagnetic instead of superconductivity, with a Neel temperature T N = 5.2 K 71 , although there is no consensus on whether the long range antiferromagnetic order is commensurate or incommensurate so far [71][72][73] .…”

Section: B Momentum Dependence Of the Hybridization Gapmentioning

confidence: 99%

“…The lattice parameters and phase transition temperatures at ambient pressure of the Ce m M n In 3m+2n family73,81 .…”

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confidence: 99%

Infrared properties of heavy fermions: evolution from weak to strong hybridizations

Chen¹,

Wang²

2016

Rep. Prog. Phys.

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In this article, we review the charge excitations of heavy fermion compounds probed by infrared spectroscopy. The article is not meant to be a comprehensive survey of experimental investigations. Rather it focuses on the dependence of charge excitations on the hybridization strength. In this context, the infrared properties of the Ce m M n In 3m+2n family are discussed in detail since the hybridization strengths differ dramatically in different members despite their similar lattice structures. Investigations on some mixed valent compounds are also presented aiming to elucidate the generic trend on the evolution. In particular, we address the scaling between hybridization energy gap ∆ dir and the hybridization strengthṼ(∝ √ WT K ) in a wide range of heavy fermions compounds which demonstrates that the periodic Anderson model can generally and quantitatively describe the low-energy charge excitations.

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“…Quantum oscillation measurements reveal the two-dimensionality of its Fermi surfaces, in accord with the layered lattice structure [14]. The long range AFM order is reported to be either commensurate or incommensurate by muon-spin rotation [15], Nuclear Quadrupolar Resonance [16] and Nuclear Magnetic Resonance measurements [17], depending on details of synthesis conditions for single or polycrystal samples. The AFM transition is suppressed by applying pressure, and superconductivity emerges in a broad dome.…”

Section: Introductionmentioning

confidence: 78%

Optical spectroscopy and ultrafast pump-probe studies on the heavy-fermion compoundCePt2In7

et al. 2016

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We report optical spectroscopy and ultrafast pump-probe measurements on the antiferromagnetic heavy fermion compound CePt 2 In 7 , a member showing stronger two dimensionality than other compounds in CeIn 3 -derived heavy-fermion family. We identify clear and typical hybridization spectral structures at low temperature from the two different spectroscopy probes. However, the strength and related energy scale of the hybridization are much weaker and smaller than that in the superconducting compounds CeCoIn 5 and CeIrIn 5 . The features are more similar to observations on the antiferromagnetic compounds CeIn 3 and CeRhIn 5 in the same family. The results clearly indicate that the Kondo interaction and hybridizations exist in the antiferromagnetic compounds but with weaker strength.

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Magnetic order in the 2D Heavy-Fermion system CePt₂In₇studied byμ⁺SR

Cited by 10 publications

References 22 publications

Magnetism and ion diffusion in honeycomb layered oxide $${\hbox {K}_2\hbox {Ni}_2\hbox {TeO}_6}$$

Magnetism and ion diffusion in honeycomb layered oxide $${\hbox {K}_2\hbox {Ni}_2\hbox {TeO}_6}$$

Infrared properties of heavy fermions: evolution from weak to strong hybridizations

Optical spectroscopy and ultrafast pump-probe studies on the heavy-fermion compoundCePt2In7

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