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Magnetism of Pd1-xN...
Magnetism of Pd1-xNix alloys near the critical concentration for ferromagnetism
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Kalvius, G. M. (författare)
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- Hartmann, Ola (författare)
- Uppsala universitet,Materialfysik
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- Wäppling, Roger (författare)
- Uppsala universitet,Materialfysik
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Guenther, A. (författare)
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Krimmel, A. (författare)
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Loidl, A. (författare)
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MacLaughlin, D. E. (författare)
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Bernal, O. O. (författare)
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Nieuwenhuys, G. J. (författare)
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Aronson, M. C. (författare)
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Dickey, R. P. (författare)
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Maple, M. B. (författare)
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Amato, A. (författare)
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Baines, C. (författare)
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(creator_code:org_t)
- 2014
- 2014
- Engelska.
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Ingår i: Physical Review B. Condensed Matter and Materials Physics. - 1098-0121 .- 1550-235X. ; 89:6, s. 064418-
- Relaterad länk:
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https://urn.kb.se/re...
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https://doi.org/10.1...
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Abstract
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- We report results of a muon spin rotation and relaxation (mu SR) study of dilute Pd1-xNix alloys, with emphasis on Ni concentrations x = 0.0243 and 0.025. These are close to the critical value x(cr) for the onset of ferromagnetic long-range order (LRO), which is a candidate for a quantum critical point. Additional control data were taken for pure nonmagnetic Pd, and for an alloy where ferromagnetism is well established (x = 0.05). The 2.43 and 2.5 at.% Ni alloys exhibit similar mu SR properties. Both samples are fully magnetic, with average zero-temperature muon local fields < B-loc(T = 0)> = 2.0 and 3.8 mT and Curie temperatures T-C = 1.0 and 2.03 K for 2.43 and 2.5 at.% Ni, respectively. The temperature dependence of < B-loc > suggests ordering of Ni spin clusters rather than isolated spins. Just above T-C, the temperature where LRO vanishes, a two-phase region is found with coexisting separate volume fractions of quasistatic short-range order (SRO) and paramagnetism. The SRO fraction decreases to zero with increasing temperature a few kelvin above T-C. This mixture of SRO and paramagnetism is consistent with the notion of an inhomogeneous alloy with Ni clustering. The measured values of T-C extrapolate to x(cr) = 0.0236 +/- 0.0027. The dynamic muon spin relaxation in the vicinity of T-C differs for the two samples: a relaxation-rate maximum at T-C is observed for x = 0.0243, reminiscent of critical slowing down, whereas for x = 0.025 no dynamic relaxation is observed within the mu SR time window. The data suggest a mean-field-like transition in this alloy.
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Kalvius, G. M.
-
Hartmann, Ola
-
Wäppling, Roger
-
Guenther, A.
-
Krimmel, A.
-
Loidl, A.
-
visa fler...
-
MacLaughlin, D. ...
-
Bernal, O. O.
-
Nieuwenhuys, G. ...
-
Aronson, M. C.
-
Dickey, R. P.
-
Maple, M. B.
-
Amato, A.
-
Baines, C.
-
visa färre...
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Physical Review ...
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Uppsala universitet