Investigation of non-magnetic iron in Lu/sub 2/Fe/sub 3/Si/sub 5/-type superconductors
Thesis/Dissertation
·
OSTI ID:6977195
A focused study on the effect of transition-metal substitution for Fe in the compounds Lu/sub 2/(Fe/sub 1-x/T/sub x/)/sub 3/Si/sub 5/ (where T = Cr, Mn, Co, Ni Cu, and Ru) is reported. The effect of these transition metals on the superconducting transition temperature shows that Cr, Co, Ni, and Ru all act as non-magnetic impurities. By fitting the experimental data T/sub c//T/sub co/ to Kaiser's equation, a good agreement with Kaiser's theory is obtained. The rate of suppression due to Co substitution is similar to that of Ru. Superconductivity persists (T/sub c/ = 0.49 K) even when 10 at. % Co is substituted for Fe. In contrast, Mn and Cu act as magnetic impurities and suppress T/sub c/ in a way described by the theory of Abrikosov and Gor'kov. The molar magnetic susceptibility of Lu/sub 2/Fe/sub 3/Si/sub 5/ does not follow a Curie-Weiss law, but rather increases slightly as temperature increases. The addition of Ru lowers the value of /sub X/(T), but the overall shape of /sub X/(T) is unchanged. In contrast, the substitution of the nominally magnetic transition metals Cr, Mn, Co and Ni for Fe causes /sub X/(T) to become more Curie-Weiss like. The magnetic susceptibility of the compound Lu/sub 2/CO/sub 3/Si/sub 5/ follows the Curie-Weiss law, while that of the compound Lu/sub 2/Ru/sub 3/Si/sub 5/ is diamagnetic. The electrical resistivity p(T) of the compound Lu/sub 2/Fe/sub 3/Si/sub 5/ is approximately quadratic in T at temperatures below 50 K and proportional to InT at temperature above 100 K.
- Research Organization:
- Iowa State Univ. of Science and Technology, Ames (USA)
- OSTI ID:
- 6977195
- Country of Publication:
- United States
- Language:
- English
Similar Records
Investigation of non-magnetic iron in Lu/sub 2/Fe/sub 3/Si/sub 5/-type superconductors
Effect of transition-metal substitution for Fe in superconducting Lu/sub 2/Fe/sub 3/Si/sub 5/
Magnetic properties of two new compounds: Pr[sub 2]Ni[sub 3]Si[sub 5] and Ho[sub 2]Ni[sub 3]Si[sub 5]
Technical Report
·
Sat Aug 01 00:00:00 EDT 1987
·
OSTI ID:6115833
Effect of transition-metal substitution for Fe in superconducting Lu/sub 2/Fe/sub 3/Si/sub 5/
Conference
·
Wed Dec 31 23:00:00 EST 1986
·
OSTI ID:6690578
Magnetic properties of two new compounds: Pr[sub 2]Ni[sub 3]Si[sub 5] and Ho[sub 2]Ni[sub 3]Si[sub 5]
Conference
·
Mon Oct 31 23:00:00 EST 1994
· IEEE Transactions on Magnetics (Institute of Electrical and Electronics Engineers); (United States)
·
OSTI ID:6623535
Related Subjects
36 MATERIALS SCIENCE
360104* -- Metals & Alloys-- Physical Properties
ALLOYS
CURIE-WEISS LAW
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
IRON ALLOYS
LUTETIUM ALLOYS
MAGNETIC PROPERTIES
MAGNETIC SUSCEPTIBILITY
PHYSICAL PROPERTIES
RARE EARTH ALLOYS
SILICON ALLOYS
SUPERCONDUCTIVITY
THERMODYNAMIC PROPERTIES
TRANSITION ELEMENT ALLOYS
TRANSITION TEMPERATURE
360104* -- Metals & Alloys-- Physical Properties
ALLOYS
CURIE-WEISS LAW
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
IRON ALLOYS
LUTETIUM ALLOYS
MAGNETIC PROPERTIES
MAGNETIC SUSCEPTIBILITY
PHYSICAL PROPERTIES
RARE EARTH ALLOYS
SILICON ALLOYS
SUPERCONDUCTIVITY
THERMODYNAMIC PROPERTIES
TRANSITION ELEMENT ALLOYS
TRANSITION TEMPERATURE