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Heavy-fermion behavior and spin-glass freezing in Si-stabilized amorphous alloys based on UPt3

Wehrle, Veronika; Müller, Thomas; Schröder, Almut; Sürgers, Christoph; Löhneysen, Hilbert von

Abstract:
U-Pt-Si and U-(Pt, Pd)-Si alloys have been prepared in the amorphous state by splat-cooling. The average nearest-neighbor distance is the same as the U-Pt distance in UPt3. The low-temperature behavior of these alloys (with composition (U0.25Pt0.75)1-xSx, x=0.18, 0.20, 0.25; and (U0.25(Pt1-yPdy)0.75)0.8Si0.2, y=0.05 and 0.1) has been studied by specific heat C, magnetization and resistivity measurements in the temperature range 1.5 K to 20 K and for magnetic fields up to 6 T. Some samples were investigated down to 0.1 K and the specific heat for one sample was measured in fields up to 22 T. With gamma0 = C/T{\textbackslash}T--{\textgreater}0 between 0.25 and 0.35 J/mole UK2, the alloys can be classified as heavy-fermion materials. As opposed to UPt3, the alloys exhibit spin-glass behavior with a concomitant decrease of gamma0. The magnetization exhibits typical spin-glass features (e.g., an irreversibility line). An inverse relationship between gamma0 and T(max) (temperature of C/T maximum which is proportional to the spin-glass freezing temperature), irrespective of the Pd content, is observed. The behavior can be qualitatively des ... mehr


Zugehörige Institution(en) am KIT Physikalisches Institut (PHI)
Publikationstyp Zeitschriftenaufsatz
Jahr 1992
Sprache Englisch
Identifikator ISSN: 0722-3277
KITopen ID: 132692
Erschienen in Zeitschrift für Physik B: Condensed Matter
Band 89
Heft 2
Seiten 161-167
Bemerkung zur Veröffentlichung Sonderdrucknummer 93S73
Schlagworte liquid behavior, magnetic-fields
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