Cluster-glass percolative scenario in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mi mathvariant="normal">Ce</mml:mi><mml:msub><mml:mi mathvariant="normal">Ni</mml:mi><mml:mrow><mml:mn>1</mml:mn><mml:mo>−</mml:mo><mml:mi>x</mml:mi></mml:mrow></mml:msub><mml:msub><mml:mi mathvariant="normal">Cu</mml:mi><mml:mi>x</mml:mi></mml:msub></mml:mrow></mml:math>studied by very low-temperature ac susceptibility and dc magnetization

Marcano, N.; Sal, J.C. Gómez; Espeso, J.I.; Barquı́n, L. Fernández; Paulsen, C.

doi:10.1103/physrevb.76.224419

Cited by 81 publications

(84 citation statements)

References 44 publications

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“…On the other hand, in the case of ferromagnetic or canted AF clusters in the system, a hysteresis is expected with large initial susceptibility because clusters at first saturate along their local easy axis and only after that became aligned with the applied field [7]. In LSCNO we observe a different behavior.…”

Section: Resultsmentioning

confidence: 77%

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Magnetic Nature of a Ni Dopant in La_1.85Sr_0.15CuO₄: Spin-Glass Behavior

et al. 2010

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The magnetic properties of La1.85Sr0.15CuO4 doped with Ni was investigated in the field up to 5 T and in the temperature range from 2 K to 400 K using both dc and ac techniques. For Ni content larger than 0.05 the system exhibits irreversibility of low-field susceptibility χ(T ) below a certain temperature depending on y and a cusp at T g in χ(T ) measured after zero-field cooling. The decay of remnant magnetization below T g with time is described by a stretched-exponential function. In accordance with scaling theory, all the χ(T ) data for y = 0.50 sample taken in the vicinity of T g at different fields collapse onto two separate curves when plotted as q|t| −β vs. B 2 |t| −β−γ , where q is the spin-glass order parameter, t = (T − T g )/T g , and β and γ are the critical exponents. All these features taken together reveal existence of spin-glass phase below T g . Variation of T g with y is linear below y = 0.25 and T g extrapolates to 0 K for y → 0 what strongly suggests that spin-glass phase extends into superconducting region of the phase diagram.

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Section: Resultsmentioning

confidence: 77%

“…for y = 1, T g = 23.5 K while the bifurcation point in χ(T ) curve is located at 80 K (not shown here). This can be a manifestation of spin clusters presence in the system [7]. The temperature T g increases linearly with Ni content, at least up to y = 0.25%, and extrapolates to zero for y = 0 (see inset to Fig.…”

Section: Resultsmentioning

confidence: 82%

Magnetic Nature of a Ni Dopant in La_1.85Sr_0.15CuO₄: Spin-Glass Behavior

et al. 2010

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“…25,28 This provides more evidence for a cluster-glass state induced by Er doping in Sc 3.1 In. 16 In a cluster glass, the relaxation time τ is a measure of the proximity to the spin-glass limit.…”

Section: -2mentioning

confidence: 82%

Cluster-glass behavior induced by local moment doping in the itinerant ferromagnet Sc3.1In

Svanidze

Morosan

2013

Phys. Rev. B

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In the presented work, Sc 3.1 In, a weak itinerant ferromagnet with no magnetic constituents, is doped with Er 3+ local moment ions, to form (Sc 1−x Er x ) 3.1 In. As x increases, the Weiss-like temperature θ stays positive and nearly triples up to x = 0.10. Moreover, Er doping of as little as x = 0.02 induces a cluster-glass state, which persists up to x = 0.10, as evidenced by dc and ac susceptibility measurements, and confirmed by the Vogel-Fulcher analysis.

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“…More recently, experimental findings in CeP d 1−x Rh x [4,5] and CeN i 1−x Cu x [6,7] have enlarged the set of non-trivial behaviour in disordered f -electron systems. In both systems, there are strong indications that a glassy behaviour is present in a suitable range of doping and this behaviour has been recently identified to appear as a cluster glass state.…”

Section: Introductionmentioning

confidence: 99%

Van Hemmen-Kondo model for disordered strongly correlated electron systems

2010

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We present here a theoretical model in order to describe the competition between the Kondo effect and the spin glass behavior. The spin glass part of the starting Hamiltonian contains Ising spins with an intersite exchange interaction given by the local van Hemmen model, while the Kondo effect is described as usual by the intrasite exchange JK . We obtain, for large JK values, a Kondo phase and, for smaller JK values, a succession, with decreasing temperature, of a spin glass phase, a mixed spin glassferromagnetic one and finally a ferromagnetic phase. This model improves the theoretical description of disordered Kondo systems with respect to previous models and can account for experimental data in Cerium disordered systems like CeCu1−xN ix alloys.

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Cluster-glass percolative scenario inCeNi1−xCuxstudied by very low-temperature ac susceptibility and dc magnetization

Cited by 81 publications

References 44 publications

Magnetic Nature of a Ni Dopant in La_1.85Sr_0.15CuO₄: Spin-Glass Behavior

Magnetic Nature of a Ni Dopant in La_1.85Sr_0.15CuO₄: Spin-Glass Behavior

Cluster-glass behavior induced by local moment doping in the itinerant ferromagnet Sc3.1In

Van Hemmen-Kondo model for disordered strongly correlated electron systems

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Cluster-glass percolative scenario inCeNi1−xCuxstudied by very low-temperature ac susceptibility and dc magnetization

Cited by 81 publications

References 44 publications

Magnetic Nature of a Ni Dopant in La1.85Sr0.15CuO4: Spin-Glass Behavior

Magnetic Nature of a Ni Dopant in La1.85Sr0.15CuO4: Spin-Glass Behavior

Cluster-glass behavior induced by local moment doping in the itinerant ferromagnet Sc3.1In

Van Hemmen-Kondo model for disordered strongly correlated electron systems

Contact Info

Product

Resources

About

Magnetic Nature of a Ni Dopant in La_1.85Sr_0.15CuO₄: Spin-Glass Behavior

Magnetic Nature of a Ni Dopant in La_1.85Sr_0.15CuO₄: Spin-Glass Behavior