Temperature dependence of fluctuation time scales in spin glasses

Gregory G. Kenning, J. Bowen, Paolo Sibani, G. F. Rodriguez

Publikation: Bidrag til tidsskriftTidsskriftartikelForskningpeer review

Resumé

Udgivelsesdato: 2010
OriginalsprogEngelsk
TidsskriftPhysical Review B
Vol/bind81
Sider (fra-til)014424
ISSN2469-9950
StatusUdgivet - 1. jan. 2010

Fingeraftryk

Spin glass
spin glass
temperature dependence
Aging of materials
Cooling
Spin fluctuations
Temperature
Superconducting transition temperature
cooling
decay
temperature
cut-off
transition temperature
scaling
curves
configurations
simulation

Citer dette

Kenning, G. G., Bowen, J., Sibani, P., & Rodriguez, G. F. (2010). Temperature dependence of fluctuation time scales in spin glasses. Physical Review B, 81, 014424.
Kenning, Gregory G. ; Bowen, J. ; Sibani, Paolo ; Rodriguez, G. F. / Temperature dependence of fluctuation time scales in spin glasses. I: Physical Review B. 2010 ; Bind 81. s. 014424.
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title = "Temperature dependence of fluctuation time scales in spin glasses",
abstract = "Using a series of fast cooling protocols we have probed aging effects in the spin glass state as a function of temperature. Analyzing the logarithmic decay found at very long time scales within a simple phenomenological barrier model, leads to the extraction of the fluctuation time scale of the system at a particular temperature. This is the smallest dynamical time-scale, defining a lower-cut off in a hierarchical description of the dynamics.  We find that this fluctuation time scale, which is approximately equal to atomic spin fluctuation time scales near the transition temperature, follows a generalized Arrhenius law. We discuss the hypothesis that, upon cooling to a measuring temperature within the spin glass state, there is a range of dynamically in-equivalent configurations in which the system can be trapped, and check within a numerical barrier model simulation, that this  leads to sub-aging behavior in scaling aged TRM decay curves, as recently discussed theoretically~\cite{Sibani09}.",
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Kenning, GG, Bowen, J, Sibani, P & Rodriguez, GF 2010, 'Temperature dependence of fluctuation time scales in spin glasses', Physical Review B, bind 81, s. 014424.

Temperature dependence of fluctuation time scales in spin glasses. / Kenning, Gregory G.; Bowen, J.; Sibani, Paolo; Rodriguez, G. F.

I: Physical Review B, Bind 81, 01.01.2010, s. 014424.

Publikation: Bidrag til tidsskriftTidsskriftartikelForskningpeer review

TY - JOUR

T1 - Temperature dependence of fluctuation time scales in spin glasses

AU - Kenning, Gregory G.

AU - Bowen, J.

AU - Sibani, Paolo

AU - Rodriguez, G. F.

PY - 2010/1/1

Y1 - 2010/1/1

N2 - Using a series of fast cooling protocols we have probed aging effects in the spin glass state as a function of temperature. Analyzing the logarithmic decay found at very long time scales within a simple phenomenological barrier model, leads to the extraction of the fluctuation time scale of the system at a particular temperature. This is the smallest dynamical time-scale, defining a lower-cut off in a hierarchical description of the dynamics.  We find that this fluctuation time scale, which is approximately equal to atomic spin fluctuation time scales near the transition temperature, follows a generalized Arrhenius law. We discuss the hypothesis that, upon cooling to a measuring temperature within the spin glass state, there is a range of dynamically in-equivalent configurations in which the system can be trapped, and check within a numerical barrier model simulation, that this  leads to sub-aging behavior in scaling aged TRM decay curves, as recently discussed theoretically~\cite{Sibani09}.

AB - Using a series of fast cooling protocols we have probed aging effects in the spin glass state as a function of temperature. Analyzing the logarithmic decay found at very long time scales within a simple phenomenological barrier model, leads to the extraction of the fluctuation time scale of the system at a particular temperature. This is the smallest dynamical time-scale, defining a lower-cut off in a hierarchical description of the dynamics.  We find that this fluctuation time scale, which is approximately equal to atomic spin fluctuation time scales near the transition temperature, follows a generalized Arrhenius law. We discuss the hypothesis that, upon cooling to a measuring temperature within the spin glass state, there is a range of dynamically in-equivalent configurations in which the system can be trapped, and check within a numerical barrier model simulation, that this  leads to sub-aging behavior in scaling aged TRM decay curves, as recently discussed theoretically~\cite{Sibani09}.

M3 - Journal article

VL - 81

SP - 014424

JO - Physical Review B

JF - Physical Review B

SN - 2469-9950

ER -