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Competing 4 f-elect...
Competing 4 f-electron dynamics in Ce(Ru1-xFex)(2)Al-10 (0
- Article/chapterEnglish2013
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LIBRIS-ID:oai:lup.lub.lu.se:8f5f444c-f8c8-4e0c-8c8c-9811c8776bd8
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https://lup.lub.lu.se/record/3979764URI
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https://doi.org/10.1103/PhysRevB.87.224415DOI
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Language:English
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Summary in:English
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We have carried out muon spin relaxation (mu SR), neutron diffraction, and inelastic neutron scattering (INS) investigations on polycrystalline samples of Ce(Ru1-xFex)(2)Al-10 (x = 0, 0.3, 0.5, 0.8, and 1) to investigate the nature of the ground state (magnetic ordered versus paramagnetic) and the origin of the spin-gap formation as evident from the bulk measurements in the end members. Our zero-field mu SR spectra clearly reveal coherent two-frequency oscillations at low temperature in x = 0, 0.3, and 0.5 samples, which confirm the long-range magnetic ordering of the Ce moment with Neel temperature T-N = 27, 26, and 21 K, respectively. On the other hand, the mu SR spectra of x = 0.8 and x = 1 down to 1.4 K and 0.045 K, respectively, exhibit a temperature-independent Kubo-Toyabe term, confirming a paramagnetic ground state. The long-range magnetic ordering in x = 0.5 below 21 K has been confirmed through the neutron diffraction study. INS measurements of x = 0 clearly reveal the presence of a sharp inelastic excitation near 8 meV between 5 K and 26 K, due to an opening of a gap in the spin excitation spectrum, which transforms into a broad response at and above 30 K. Interestingly, at 4.5 K, the spin-gap excitation broadens in x = 0.3 and exhibits two clear peaks at 8.4(3) and 12.0(5) meV in x = 0.5. In the x = 0.8 sample, which remains paramagnetic down to 1.2 K, there is a clear signature of a spin gap of 10-12 meV at 7 K, with a strong wave-vector-dependent intensity. Evidence of a spin gap of 12.5(5) meV has also been found in x = 1. The observation of a spin gap in the paramagnetic samples (x = 0.8 and 1) is an interesting finding in this study, and it challenges our understanding of the origin of the semiconducting gap in CeT2Al10 (T = Ru and Os) compounds in terms of a hybridization gap opening only a small part of the Fermi surface, gapped spin waves, or a spin-dimer gap.
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Hillier, A. D.
(author)
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Muro, Y.
(author)
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Kajino, J.
(author)
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Takabatake, T.
(author)
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Peratheepan, P.
(author)
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Strydom, A. M.
(author)
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Deen, PascaleLund University,Lunds universitet,European Spallation Source ESS AB,Stiftelser och övriga anknutna verksamheter,Other Institutions and Utilities(Swepub:lu)esss-pdn
(author)
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Demmel, F.
(author)
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Stewart, J. R.
(author)
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Taylor, J. W.
(author)
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Smith, R. I.
(author)
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Ramos, S.
(author)
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Adams, M. A.
(author)
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European Spallation Source ESS ABStiftelser och övriga anknutna verksamheter
(creator_code:org_t)
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In:Physical Review B (Condensed Matter and Materials Physics)87:221098-0121
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Adroja, D. T.
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Hillier, A. D.
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Muro, Y.
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Kajino, J.
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Takabatake, T.
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Peratheepan, P.
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Strydom, A. M.
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Deen, Pascale
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Demmel, F.
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Stewart, J. R.
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Taylor, J. W.
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Smith, R. I.
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Ramos, S.
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Adams, M. A.
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- NATURAL SCIENCES
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Lund University