Superconductivity, magnetic susceptibility, and magnetic resonance studies of the pseudobinary systems Eu/sub 1. 2/Mo/sub 6/Se/sub 8/-Eu/sub 1. 2/Mo/sup 6/Se/sup 8/ and LaMo/sub 6/Se/sub 8/-EuMo/sub 6/Se/sub 8/

Journal Article · Wed Apr 11 04:00:00 EST 1984 · Inorg. Chem.; (United States)

DOI:https://doi.org/10.1021/ic00176a018· OSTI ID:6213380

Tarascon, J M; Harrison, M R; Johnson, D C; Sienko, M J

Superconducting critical temperatures, measured by an ac mutual-inductance technique at ambient pressure, show for series La/sub 1-x/Eu/sub x/Mo/sub 6/Se/sub 8/ approximately the same behaviour as previously reported for the series La/sub 1-x/Yb/sub x/Mo/sub 6/Se/sub 8/; the decrease in the transition temperature with increasing x and the absence of superconductivity above 1.5 K for compositions with x>0.8 may be explained solely in terms of the theory of Abrikosov and Gor'kov. This is not the case for the corresponding sulfide systems. None of the compositions in the series Eu/sub 1.2/Mo/sub 6/(S/sub 1-x/Se/sub x/)/sub 8/ were found to be superconducting at ambient pressure above 1.5 K. Magnetic susceptibility measurements have been carried out by the Faraday method over the temperature range 2-300 K and confirm that the europium ions are divalent over the entire composition range for both series. X-Band electron spin resonance spectra obtained from the europium ions may be explained by assuming a spin Hamiltonian containing crystal field terms that are much larger than the Zeeman interaction term. In addition, measurements on the compositions in the series Eu/sub 1.2/Mo/sub 6/(S/sub 1-x/Se/sub x/)/sub 8/ reveal the presence of a europium-containing impurity phase, EuS/sub 1-x/Se/sub x/, in substantial quantities.

• Research Organization: Cornell Univ., Ithaca, NY
• OSTI ID: 6213380
• Journal Information: Inorg. Chem.; (United States), Journal Name: Inorg. Chem.; (United States) Vol. 236:8; ISSN INOCA
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360603* -- Materials-- Properties
ABSORPTION SPECTRA
CHALCOGENIDES
CORRELATIONS
DATA
DATA ANALYSIS
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
ELECTRON SPIN RESONANCE
EUROPIUM COMPOUNDS
EUROPIUM SELENIDES
EUROPIUM SULFIDES
EXPERIMENTAL DATA
FARADAY METHOD
HAMILTONIANS
IMPURITIES
INFORMATION
LANTHANUM COMPOUNDS
LANTHANUM SELENIDES
MAGNETIC PROPERTIES
MAGNETIC RESONANCE
MAGNETIC SUSCEPTIBILITY
MATHEMATICAL OPERATORS
MOLYBDENUM COMPOUNDS
MOLYBDENUM SELENIDES
MOLYBDENUM SULFIDES
NUMERICAL DATA
PHYSICAL PROPERTIES
QUANTUM OPERATORS
RARE EARTH COMPOUNDS
REFRACTORY METAL COMPOUNDS
RESONANCE
SELENIDES
SELENIUM COMPOUNDS
SPECTRA
STRUCTURAL CHEMICAL ANALYSIS
SULFIDES
SULFUR COMPOUNDS
SUPERCONDUCTIVITY
THERMODYNAMIC PROPERTIES
TRANSITION ELEMENT COMPOUNDS
TRANSITION TEMPERATURE