A mu SR study of paramagnetic fluctuations in rare-earth-aluminium intermetallics

Hartmann, O.; Karlsson, E.; Wäppling, R.; Chappert, J.; Yaouanc, A.; Asch, L.; Kalvius, G. M.

doi:10.1088/0305-4608/16/10/025

Cited by 61 publications

(14 citation statements)

References 25 publications

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“…Another important result to outline is the significant increase of the relaxation rate with temperature in the paramagnetic state. This effect constitutes a clear indication of the presence of short-range magnetic correlations above the Curie temperature [31,32].…”

Section: µSr Resultsmentioning

confidence: 85%

A combined study of the magnetic properties of GdCrO₄

Jimenez-Melero

Gubbens

Steenvoorden

et al. 2006

J. Phys.: Condens. Matter

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We have performed a detailed study of the magnetic properties of GdCrO 4 at low temperatures by complementary use of different macroscopic and microscopic physical techniques. A ferromagnetic order is established in this oxide below T C = 22 K. The ordered magnetic moments of the Cr 5+ ions are located along the crystallographic c-axis, forming an angle of ≈24• with the ordered moments of the Gd 3+ ions. Surprisingly, only 20% of the Gd 3+ sublattice orders at the Curie temperature of 22 K, while the remaining 80% stays paramagnetic down to around 10 K. This 80% of the Gd 3+ ions may be ascribed to a lowtemperature orthorhombic phase. Moreover, the Gd 3+ magnetic order seems to be triggered by a relatively large transferred hyperfine field coming from the Cr 5+ sublattice.

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Section: µSr Resultsmentioning

confidence: 85%

A combined study of the magnetic properties of GdCrO₄

Jimenez-Melero

Gubbens

Steenvoorden

et al. 2006

J. Phys.: Condens. Matter

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“…Similar behavior is observed in the disordered FM Pd-Mn(2 %) [13] which becomes a spin glass by tuning the impurity concentration: The muon relaxation rate in transverse fields is proportional to the magnetization confirming randomly placed spins. In contrast, homogeneous itinerant magnets of stoichiometric compounds show only a very weak λ T F well above the FM transition T c [14]. Spin correlation and dynamics are better probed in zero and longitudinal fields [15] undisturbed by dephasing.…”

Section: Muon Spin Rotationmentioning

confidence: 96%

Evidence for magnetic clusters in Ni_1-xV_xclose to the quantum critical concentration

Wang

Ubaid-Kassis

Schroeder

et al. 2015

J. Phys.: Conf. Ser.

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The d-metal alloy Ni1−xVx undergoes a quantum phase transition from a ferromagnetic ground state to a paramagnetic ground state as the vanadium concentration x is increased. We present magnetization, ac-susceptibility and muon-spin relaxation data at several vanadium concentrations near the critical concentration xc ≈ 11.6 % at which the onset of ferromagnetic order is suppressed to zero temperature. Below xc, the muon data reveal a broad magnetic field distribution indicative of long-range ordered ferromagnetic state with spatial disorder. We show evidence of magnetic clusters in the ferromagnetic phase and close to the phase boundary in this disordered itinerant system as an important generic ingredient of a disordered quantum phase transition. In contrast, the temperature dependence of the magnetic susceptibility above xc is best described in terms of a magnetic quantum Griffiths phase with a power-law distribution of fluctuation rates of dynamic magnetic clusters. At the lowest temperatures, the onset of a short-range ordered cluster-glass phase is recognized by an increase in the muon depolarization in transverse fields and maxima in ac-susceptibility.

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“…For example, in PrAl 2 a rate at least one order of magnitude faster was determined from mSR measurements well above the magnetic ordering temperature [16]. On the other hand, in PrAu 2 Si 2 the estimates above show that the condition for the fully spin-dynamic regime 1=t f q D is still valid.…”

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confidence: 85%