Frequency dependence of the ac susceptibility of Eu/sub x/Sr/sub 1-x/S

Journal Article · Mon Mar 01 00:00:00 EST 1982 · J. Appl. Phys.; (United States)

DOI:https://doi.org/10.1063/1.330780· OSTI ID:5584122

Holtzberg, F; Francavilla, T L; Huang, C Y; Tholence, J L

The ac susceptibility of Eu/sub 0.44/Sr/sub 0.56/S and Eu/sub 0.48/Sr/sub 0.52/ has been measured at low frequency (17 Hz<..nu..<2100 Hz) and at 9 x 10/sup 9/ Hz. A strong frequency dependence of the real part of the susceptibility is observed below the spin-glass transition temperature T/sub f/. Moreover, the increase of T/sub f/ with frequency ..nu.. can be described with a Fulcher law ..nu.. = ..nu../sub 0/ exp(-E/sub a//k(T/sub f/-T/sub 0/)), with ..nu../sub 0/ = 10/sup 13/ s/sup -1/ and T/sub 0/ = 1.3 and 1.65 K, respectively, for x = 0.44 and 0.48. These data, compared to a similar analysis of other ac measurements indicate that (T/sub f/(..nu..)-T/sub 0/) and E/sub a//k remain almost constant for x between 0.15 and 0.48. Both T/sub f/(..nu..) and T/sub 0/ increase linearly with x in the same concentration range. This confirms that the spin-glass transition becomes less time dependent for an increasing fraction of interacting impurities (the ferromagnetism is observed for x>0.5 in this system).

• Research Organization: International Business Machines, Yorktown Heights, New York 10598
• OSTI ID: 5584122
• Journal Information: J. Appl. Phys.; (United States), Vol. 53:3
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
EUROPIUM COMPOUNDS
MAGNETIC SUSCEPTIBILITY
EUROPIUM SULFIDES
STRONTIUM COMPOUNDS
STRONTIUM SULFIDES
EXPERIMENTAL DATA
FREQUENCY DEPENDENCE
GHZ RANGE 01-100
HZ RANGE
KHZ RANGE 01-100
SPIN GLASS STATE
TRANSITION TEMPERATURE
ALKALINE EARTH METAL COMPOUNDS
CHALCOGENIDES
DATA
FREQUENCY RANGE
GHZ RANGE
INFORMATION
KHZ RANGE
MAGNETIC PROPERTIES
NUMERICAL DATA
PHYSICAL PROPERTIES
RARE EARTH COMPOUNDS
SULFIDES
SULFUR COMPOUNDS
THERMODYNAMIC PROPERTIES
360603* - Materials- Properties