Search for a spin glass state in PrAu2Si2 by μSR

Noakes, D. R.; Kalvius, Georg Michael; Wäppling, R.; Schreier, E.; Krimmel, A.; Loidl, A.

doi:10.1016/j.ssc.2004.04.045

Cited by 4 publications

(6 citation statements)

References 19 publications

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“…Both data sets are however in full accord with the recent SR study which found no static order in PrAu 2 Si 2 down to 40 mK. 11 We turn now to the diffraction data, and concentrate on PrAu 2 Si 2 as it is here that the presence or absence of Au/Si substitution is critical, and also the Au-Si scattering length contrast is superior to that of Au-Ge in both x rays ͑Z Si = 14, Z Ge = 32, Z Au =79͒ and neutrons ͓b c = 4.15͑Si͒, 8.18͑Ge͒, 7.90͑Au͒ fm͔. Figure 3 shows x-ray and neutron diffraction data for PrAu 2 Si 2 .…”

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confidence: 88%

“…10 A more recent muon spin relaxation ͑SR͒ study of the same materials offers an intriguing solution to the problem. Noakes et al found no evidence for static order down to 40 mK in PrAu 2 Si 2 , suggesting that the Pr moments remained dynamic at temperatures well below T f ϳ 3.2 K. 11 We have used 197 Au Mössbauer spectroscopy and revisited the x-ray and neutron diffraction data on this system in order to address two key questions: ͑i͒ what, if any, is the nature of the Pr ordering? ͑ii͒ what level of chemical disorder is present in PrAu 2 Si 2 ?…”

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confidence: 99%

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Site disorder and spin-glass ordering in PrAu2Si2

Ryan

Voyer

Swainson

et al. 2005

Journal of Applied Physics

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We have used 197 Au Mössbauer spectroscopy along with both neutron and x-ray diffraction to search for site disorder and noncollinear magnetic ordering in PrAu 2 Si 2. There is no evidence of a transferred hyperfine field at the Au site down to 1.7 K allowing us to rule out both collinear antiferromagnetic order and spin-glass ordering of the Pr moments. Full-pattern Rietveld refinement of both neutron and x-ray diffraction data taken over a wide angle range allows us to exclude Au/Si site disorder at the 1% level. We conclude that the Pr moments do not order above 1.7 K in PrAu 2 Si 2 , and that the susceptibility peak is likely a dynamic effect.

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confidence: 88%

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confidence: 99%

Site disorder and spin-glass ordering in PrAu2Si2

Ryan

Voyer

Swainson

et al. 2005

Journal of Applied Physics

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“…However, sample S3 seems to have been well annealed, and the impurities and possible site disorder of some Au and Si atoms may have been almost completely removed, making its structure close to the ideal ordered ThCr 2 Si 2 type, and therefore no SG state is formed. It should be emphasized that the observed result for S3 is consistent with the μSR [10] and Mössbauer [11] measurements that exclude the existence of SG state. Note that, considering that PrAu 2 Si 2 has a singlet ground state and the interionic exchange coupling is very close to the critical value to induce magnetic order, the SG behavior reported in reference [8] for this system was once interpreted to originate from the dynamic fluctuations of the CF levels [12].…”

Section: Resultssupporting

confidence: 87%

“…However, the μSR spectroscopy down to 40 mK shows no evidence that the SG state is formed in PrAu 2 Si 2 [10]. Moreover, subsequent Mössbauer studies down to 1.7 K along with neutron and x-ray diffraction (XRD) measurements [11] also exclude both SG ordering and collinear antiferromagnetic order of the Pr moments (the samples used are those used in the research works reported in references [8,9]).…”

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confidence: 98%

Transition from spin glass to paramagnetism in the magnetic properties of PrAu₂Si₂

Li¹,

Shimizu²,

Nakamura³

et al. 2022

J. Phys.: Condens. Matter

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It is unexpected that a spin-glass transition, which generally occurs only in system with some form of disorder, was observed in the ThCr2Si2-type compound PrAu2Si2 at a temperature of 3 K. This puzzling phenomenon was later explained based on a novel dynamic frustration model that does not involve static disorder. We present the results of re-veriﬁcation of the reported spin-glass behaviors by measuring the physical properties of three polycrystalline PrAu2Si2 samples annealed under different conditions. Indeed, in the sample annealed at 827 ◦C for one week, a spin-glass transition does occur at a temperature of T f~2.8 K as that reported previously in the literature. However, it is newly found that the spin-glass eﬀect is actually more pronounced in the as-cast sample, and almost completely disappears in the well-annealed (at 850 ◦C for 4 weeks) sample. The annealing effect observed in PrAu2Si2, that is, spin glass to paramagnetism transition is discussed by comparing with earlier results reported on the same system and other isomorphic compounds.

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“…It is believed that a small amount of Au and Si atoms in this sample may occupy other sites of the ThCr 2 Si 2 type structure and cause the observed SG effect [8]. However, µSR spectroscopy down to 40 mK shows no evidence that the SG state is formed in PrAu 2 Si 2 [10]. Moreover, the subsequent Mössbauer studies down to 1.7 K along with neutron and x-ray diffraction measurements [11] also exclude both SG ordering and collinear antiferromagnetic order of the Pr moments.…”

Section: Introductionmentioning

confidence: 79%

Disappearance of spin glass behavior in ThCr2Si2-type intermetallic PrAu2Si2

Li,

Shimizu,

Nakamura

et al. 2021

Preprint

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It is unexpected that a spin-glass transition, which generally occurs only in the system with some form of disorder, was observed in the ThCr 2 Si 2 -type compound PrAu 2 Si 2 at a temperature of ∼3 K. This puzzling phenomenon was later explained based on a novel dynamic frustration model that does not involve static disorder. We present the results of re-verification of the reported spin-glass behaviors by measuring the physical properties of three polycrystalline PrAu 2 Si 2 samples annealed under different conditions. Indeed, in the sample annealed at 827 • C for one week, a spin-glass transition does occur at a temperature of T f ∼ 2.8 K as that reported previously in the literature. However, it is newly found that the spin-glass effect is actually more pronounced in the as-cast sample, and almost completely disappears in the well-annealed (at 850 • C for 4 weeks) sample. The apparent sample dependence of the magnetic characteristics of PrAu 2 Si 2 is discussed by comparing it with similar phenomena observed in the isomorphic compounds URh 2 Ge 2 and CeAu 2 Si 2 . Our experimental results strongly suggest that the spin-glass behavior observed in the as cast and insufficient annealed samples is most likely due to the presence of small amount of crystalline impurities and/or partial site disorder on the Au and Si sublattices, and thus is not the inherent characteristic of ideal ThCr 2 Si 2 -type PrAu 2 Si 2 . The perfectly ordered PrAu 2 Si 2 should be regarded as a paramagnetic system with obvious crystal-field effects.

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Search for a spin glass state in PrAu2Si2 by μSR

Cited by 4 publications

References 19 publications

Site disorder and spin-glass ordering in PrAu2Si2

Site disorder and spin-glass ordering in PrAu2Si2

Transition from spin glass to paramagnetism in the magnetic properties of PrAu₂Si₂

Disappearance of spin glass behavior in ThCr2Si2-type intermetallic PrAu2Si2

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Search for a spin glass state in PrAu2Si2 by μSR

Cited by 4 publications

References 19 publications

Site disorder and spin-glass ordering in PrAu2Si2

Site disorder and spin-glass ordering in PrAu2Si2

Transition from spin glass to paramagnetism in the magnetic properties of PrAu2Si2

Disappearance of spin glass behavior in ThCr2Si2-type intermetallic PrAu2Si2

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Transition from spin glass to paramagnetism in the magnetic properties of PrAu₂Si₂