Low temperature magnetic and resistive behavior of the (Eu/sub 1-x/Sn/sub x/)/sub y/Mo/sub 6/S/sub 8/ system
Magnetoresistance and ac susceptibility measurements were made on sintered samples of the compounds (Eu/sub 1-x/Sn/sub x/)/sub y/Mo/sub 6/S/sub 8/ for x = 0 and 0.1 at y = 1.2 and x = 0 and 0.15 at y = 1.0. All samples show negative temperature coefficients of resistance in zero field in the range 4 to 0.02 K. For the pure x = 0 samples the resistance becomes constant below 0.5 K. The magnetoresistance is large and negative for all samples; at 2.4 T and below 0.5 K it is about 11% for y = 1.0 and 40% for y = 1.2. For the finite x samples the presence of superconducting second phases made detailed interpretation of the low field resistance data for x = 0.1, y = 1.2, and most of the data for x = 0.15, y = 1.0 somewhat ambiguous. The magnetoresistance saturates for all the samples below 1/sup 0/K in fields of approx. 2 T or greater. The susceptibility of all the samples has a peak near 0.3/sup 0/K. The resistive behavior of the samples is characteristic of a magnetic semiconductor. The susceptibility results point to magnetic ordering of the system near 0.3/sup 0/K. 5 figures.
- Research Organization:
- Los Alamos National Laboratory (LANL), Los Alamos, NM (United States); California Univ., San Diego, La Jolla (USA)
- DOE Contract Number:
- W-7405-ENG-36
- OSTI ID:
- 6928082
- Report Number(s):
- LA-UR-80-2827; CONF-801134-4; TRN: 80-019306
- Resource Relation:
- Conference: 26. annual conference on magnetism and magnetic metals, Dallas, TX, USA, 11 Nov 1980
- Country of Publication:
- United States
- Language:
- English
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ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
EUROPIUM SULFIDES
MAGNETIC PROPERTIES
MOLYBDENUM SULFIDES
TIN SULFIDES
CHEMICAL COMPOSITION
MAGNETIC SUSCEPTIBILITY
MAGNETORESISTANCE
QUANTITY RATIO
TEMPERATURE DEPENDENCE
ULTRALOW TEMPERATURE
CHALCOGENIDES
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
EUROPIUM COMPOUNDS
MOLYBDENUM COMPOUNDS
PHYSICAL PROPERTIES
RARE EARTH COMPOUNDS
SULFIDES
SULFUR COMPOUNDS
TIN COMPOUNDS
TRANSITION ELEMENT COMPOUNDS
400201* - Chemical & Physicochemical Properties