High Field Magnetization of UPt2Si2

Grachtrup, Dirk Schulze; Bleckmann, Matthias; Süllow, S.; Willenberg, Benjamin; Rakoto, H.; Skourski, Y.; Mydosh, J. A.

doi:10.1007/s10909-009-0106-6

Cited by 3 publications

(7 citation statements)

References 9 publications

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“…Recently, in a brief report on a reinvestigation of the high-field magnetization, we presented arguments against this interpretation. 33 Here we will present a full account of our high-field studies, adding to our arguments in favor of an alternative view of the properties of UPt 2 Si 2 . In particular, we report on the discovery of new field-induced phases in UPt 2 Si 2 , which we tentatively associate to Lifshitz-type transitions.…”

Section: Introductionmentioning

confidence: 98%

Field-induced phases in UPt2Si2

et al. 2012

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The tetragonal compound UPt 2 Si 2 has been characterized as a moderately mass-enhanced system with an antiferromagnetic (AFM) ground state below T N = 32 K. Here, we present an extensive study of the behavior in high magnetic fields. We have performed pulsed field magnetization and static field resistivity measurements on single crystalline samples UPt 2 Si 2. Along the crystallographic a axis, at low temperatures, we find a metamagnetic-like transition in fields of the order 40 T, possibly indicating a first-order transition. Along the crystallographic c axis, in magnetic fields of B 24 T, we find distinct anomalies in both properties. From our analysis of the data we can distinguish new high-field phases above the AFM ground state. We discuss the emergence of these new phases in the context of Fermi surface effects and the possible occurrence of a Lifshitz or electronic topological transition, this in contrast to previous modelings of UPt 2 Si 2 based on crystal electric field effects.

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Section: Introductionmentioning

confidence: 98%

Field-induced phases in UPt2Si2

et al. 2012

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“…The normal contribution ρ reflects terms dependent on the resistivity and/or magnetization (reported in Refs. [24][25][26]). Therefore, adding to the data published in Ref.…”

Section: Resultsmentioning

confidence: 99%

“…Then, the upturn in ρ xy at the phase I-III boundary might be attributed to the corresponding upturn in the magnetization M (see Refs. [24][25][26]). Conversely, at the phase III-V boundary the downturn in ρ xy is clearly at odds with the upturn in M. It implies that this phase transition is accompanied by a carrier density change, which may involve a qualitative change of the Fermi surface as in an ETT.…”

Section: Resultsmentioning

confidence: 99%

“…Moreover, for fields B c axis, above 24 T the experimental data strongly deviate from the CEF theoretical predictions. In particular, a complex series of field-induced phases is observed above 24 T which cannot be attributed only to spin reorientation processes and/or crystal-field effects [23][24][25][26]. As an alternative to the CEF model, we have proposed that an itinerant picture of the properties of UPt 2 Si 2 is more appropriate, a view supported by recent band structure calculations [27].…”

Section: Introductionmentioning

confidence: 83%

“…For magnetic fields B a axis, aside from the suppression of AFM order, there is a hysteretic high-field (∼40 T) regime whose nature is not understood as yet [25,26] (see Fig. 7 below).…”

Section: Introductionmentioning

confidence: 99%

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Magnetic phase diagram and electronic structure of UPt2Si2 at high magnetic fields: A possible field-induced Lifshitz transition

et al. 2017

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We have measured the Hall effect, magnetotransport, and magnetostriction on the field-induced phases of single-crystalline UPt 2 Si 2 in magnetic fields up to 60 T at temperatures down to 50 mK, firmly establishing the phase diagram for magnetic fields B a and c axes. Moreover, for the B c axis we observe strong changes in the Hall effect at the phase boundaries. From a comparison to band structure calculations utilizing the concept of a dual nature of the uranium 5f electrons, we propose that these represent field-induced topological changes of the Fermi surface due to at least one Lifshitz transition. Furthermore, we find a unique history dependence of the magnetotransport and magnetostriction data, indicating that the proposed Lifshitz-type transition is of a discontinuous nature, as predicted for interacting electron systems.

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