Spectroscopy of RKKY spin glasses (abstract)

Lévy, Laurent P. ; Ogielski, Andrew T.

[S.l.] : American Institute of Physics (AIP)
Published 1987
ISSN:
1089-7550
Source:
AIP Digital Archive
Topics:
Physics
Notes:
We have measured the nonlinear susceptibilities χ4, χ6, χ8 of dilute AgMn spin glasses above and below the transition temperature Tg as a function of temperature, magnetic field, and frequency. In the static limit, these quantities display very well-defined singularities at Tg with very weak magnetic field dependence. At very low frequencies, we show that the nonlinear susceptibilities χ2n can be related to 2n spin-spin correlation functions by Kubo formulas, and that their measured critical exponents are consistent with the usual scaling hypothesis. Thus, we can infer β=0.9, γ=2.1, and δ=3.0. The nonlinear susceptibilities scale above the transition as power laws of frequency with exponents which depend weakly on temperature. To relate these exponents by dynamic scaling require several ansatz which validity are investigated. In a magnetic field, only one singularity is observed at the same temperature Tg as in zero field, but the frequency dependence of the nonlinear susceptibilities weakens below the transition. We also discuss the frequency dependence of the linear and nonlinear susceptibilities below the spin-glass transition.
Type of Medium:
Electronic Resource
URL:
_version_ 1798289676388270081
autor Lévy, Laurent P.
Ogielski, Andrew T.
autorsonst Lévy, Laurent P.
Ogielski, Andrew T.
book_url http://dx.doi.org/10.1063/1.338541
datenlieferant nat_lic_papers
hauptsatz hsatz_simple
identnr NLZ218745931
issn 1089-7550
journal_name Journal of Applied Physics
materialart 1
notes We have measured the nonlinear susceptibilities χ4, χ6, χ8 of dilute AgMn spin glasses above and below the transition temperature Tg as a function of temperature, magnetic field, and frequency. In the static limit, these quantities display very well-defined singularities at Tg with very weak magnetic field dependence. At very low frequencies, we show that the nonlinear susceptibilities χ2n can be related to 2n spin-spin correlation functions by Kubo formulas, and that their measured critical exponents are consistent with the usual scaling hypothesis. Thus, we can infer β=0.9, γ=2.1, and δ=3.0. The nonlinear susceptibilities scale above the transition as power laws of frequency with exponents which depend weakly on temperature. To relate these exponents by dynamic scaling require several ansatz which validity are investigated. In a magnetic field, only one singularity is observed at the same temperature Tg as in zero field, but the frequency dependence of the nonlinear susceptibilities weakens below the transition. We also discuss the frequency dependence of the linear and nonlinear susceptibilities below the spin-glass transition.
package_name American Institute of Physics (AIP)
publikationsjahr_anzeige 1987
publikationsjahr_facette 1987
publikationsjahr_intervall 8014:1985-1989
publikationsjahr_sort 1987
publikationsort [S.l.]
publisher American Institute of Physics (AIP)
reference 61 (1987), S. 4103-4103
search_space articles
shingle_author_1 Lévy, Laurent P.
Ogielski, Andrew T.
shingle_author_2 Lévy, Laurent P.
Ogielski, Andrew T.
shingle_author_3 Lévy, Laurent P.
Ogielski, Andrew T.
shingle_author_4 Lévy, Laurent P.
Ogielski, Andrew T.
shingle_catch_all_1 Lévy, Laurent P.
Ogielski, Andrew T.
Spectroscopy of RKKY spin glasses (abstract)
We have measured the nonlinear susceptibilities χ4, χ6, χ8 of dilute AgMn spin glasses above and below the transition temperature Tg as a function of temperature, magnetic field, and frequency. In the static limit, these quantities display very well-defined singularities at Tg with very weak magnetic field dependence. At very low frequencies, we show that the nonlinear susceptibilities χ2n can be related to 2n spin-spin correlation functions by Kubo formulas, and that their measured critical exponents are consistent with the usual scaling hypothesis. Thus, we can infer β=0.9, γ=2.1, and δ=3.0. The nonlinear susceptibilities scale above the transition as power laws of frequency with exponents which depend weakly on temperature. To relate these exponents by dynamic scaling require several ansatz which validity are investigated. In a magnetic field, only one singularity is observed at the same temperature Tg as in zero field, but the frequency dependence of the nonlinear susceptibilities weakens below the transition. We also discuss the frequency dependence of the linear and nonlinear susceptibilities below the spin-glass transition.
1089-7550
10897550
American Institute of Physics (AIP)
shingle_catch_all_2 Lévy, Laurent P.
Ogielski, Andrew T.
Spectroscopy of RKKY spin glasses (abstract)
We have measured the nonlinear susceptibilities χ4, χ6, χ8 of dilute AgMn spin glasses above and below the transition temperature Tg as a function of temperature, magnetic field, and frequency. In the static limit, these quantities display very well-defined singularities at Tg with very weak magnetic field dependence. At very low frequencies, we show that the nonlinear susceptibilities χ2n can be related to 2n spin-spin correlation functions by Kubo formulas, and that their measured critical exponents are consistent with the usual scaling hypothesis. Thus, we can infer β=0.9, γ=2.1, and δ=3.0. The nonlinear susceptibilities scale above the transition as power laws of frequency with exponents which depend weakly on temperature. To relate these exponents by dynamic scaling require several ansatz which validity are investigated. In a magnetic field, only one singularity is observed at the same temperature Tg as in zero field, but the frequency dependence of the nonlinear susceptibilities weakens below the transition. We also discuss the frequency dependence of the linear and nonlinear susceptibilities below the spin-glass transition.
1089-7550
10897550
American Institute of Physics (AIP)
shingle_catch_all_3 Lévy, Laurent P.
Ogielski, Andrew T.
Spectroscopy of RKKY spin glasses (abstract)
We have measured the nonlinear susceptibilities χ4, χ6, χ8 of dilute AgMn spin glasses above and below the transition temperature Tg as a function of temperature, magnetic field, and frequency. In the static limit, these quantities display very well-defined singularities at Tg with very weak magnetic field dependence. At very low frequencies, we show that the nonlinear susceptibilities χ2n can be related to 2n spin-spin correlation functions by Kubo formulas, and that their measured critical exponents are consistent with the usual scaling hypothesis. Thus, we can infer β=0.9, γ=2.1, and δ=3.0. The nonlinear susceptibilities scale above the transition as power laws of frequency with exponents which depend weakly on temperature. To relate these exponents by dynamic scaling require several ansatz which validity are investigated. In a magnetic field, only one singularity is observed at the same temperature Tg as in zero field, but the frequency dependence of the nonlinear susceptibilities weakens below the transition. We also discuss the frequency dependence of the linear and nonlinear susceptibilities below the spin-glass transition.
1089-7550
10897550
American Institute of Physics (AIP)
shingle_catch_all_4 Lévy, Laurent P.
Ogielski, Andrew T.
Spectroscopy of RKKY spin glasses (abstract)
We have measured the nonlinear susceptibilities χ4, χ6, χ8 of dilute AgMn spin glasses above and below the transition temperature Tg as a function of temperature, magnetic field, and frequency. In the static limit, these quantities display very well-defined singularities at Tg with very weak magnetic field dependence. At very low frequencies, we show that the nonlinear susceptibilities χ2n can be related to 2n spin-spin correlation functions by Kubo formulas, and that their measured critical exponents are consistent with the usual scaling hypothesis. Thus, we can infer β=0.9, γ=2.1, and δ=3.0. The nonlinear susceptibilities scale above the transition as power laws of frequency with exponents which depend weakly on temperature. To relate these exponents by dynamic scaling require several ansatz which validity are investigated. In a magnetic field, only one singularity is observed at the same temperature Tg as in zero field, but the frequency dependence of the nonlinear susceptibilities weakens below the transition. We also discuss the frequency dependence of the linear and nonlinear susceptibilities below the spin-glass transition.
1089-7550
10897550
American Institute of Physics (AIP)
shingle_title_1 Spectroscopy of RKKY spin glasses (abstract)
shingle_title_2 Spectroscopy of RKKY spin glasses (abstract)
shingle_title_3 Spectroscopy of RKKY spin glasses (abstract)
shingle_title_4 Spectroscopy of RKKY spin glasses (abstract)
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source_archive AIP Digital Archive
timestamp 2024-05-06T08:04:37.335Z
titel Spectroscopy of RKKY spin glasses (abstract)
titel_suche Spectroscopy of RKKY spin glasses (abstract)
topic U
uid nat_lic_papers_NLZ218745931