Resistivity of positive-J spin glasses: Study ofLaGd under hydrostatic pressure

Larsen, Ulf; Peukert, H.; Schilling, J. S.

doi:10.1007/bf01365367

Cited by 2 publications

(2 citation statements)

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“…The curves show a pronounced maximum at about T g = 30 K. A careful analysis of the χ AC data indicates that T g increases by about 1.5 K when the probe AC field frequency is increased from 340 to 5000 Hz (figure 4). The character of the curves shown in figure 4 is similar to the one reported by Larsen et al (1980) for spin-glass fcc Gd 8 La 92 alloy. Magnetization experiments were performed on the sample studied here in order to obtain more information on the magnetic structure of the alloy below T g .…”

Section: Resultssupporting

confidence: 83%

“…Dilute Gd-La alloys (>90 at.% La) were also extensively studied by other authors due to interest in the effects of the magnetic impurities of Gd in the La matrix. These dilute alloys have an fcc structure and showed magnetic transitions at low temperatures which were interpreted as being as of spin-glass type (Finnemore et al 1968, Larsen et al 1980.…”

Section: Introductionmentioning

confidence: 99%

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Low field magnetic studies of some alloys

Larica¹,

Nunes²,

Freitas

1999

J. Phys.: Condens. Matter

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Polycrystalline pure Gd and Gd 1−x La x (x = 0.15, 0.25, 0.27 and 0.50) alloys have been studied by low field magnetic susceptibility (χ AC ), magnetization and electrical resistivity measurements. Measurements were also performed on samples with low demagnetizing factor geometry in order to study the ground state properties of these systems. For hexagonal closepacked (hcp) samples the effect of spin reorientation is indicated by a broad peak in the susceptibility curve and it shifts rapidly to lower temperatures with increasing La content in Gd metal. The spin reorientation effect is not observed in the samples with La concentration higher than 15%. The χ AC and resistivity measurements indicate a ferromagnetic transition at T C = 225 K for 15% La concentration. For the Sm-type structure sample, with x = 0.27, two magnetic transition peaks are observed at 135 K and 113 K and helical antiferromagnetic order is suggested. Finally, the results for the x = 0.50 alloy with double hexagonal close-packed (dhcp) crystalline structure indicate a spin-glass magnetic phase type, below T g = 30 K. Observed magnetization remanent effects, in this latter case, give additional support for the presence of the spin-glass phase.

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Section: Resultssupporting

confidence: 83%

Section: Introductionmentioning

confidence: 99%