TY - JOUR
T1 - Compensation effect in an exchange enhanced superconductor
T2 - [(La.993Lu.007)1-xGdx]Ru2
AU - Jones, T. E.
AU - Chock, E. P.
AU - Chaikin, P. M.
PY - 1976/11
Y1 - 1976/11
N2 - We have measured the upper critical field, Hc2, of alloys of the form [(La.993Lu.007)1-xGdx]Ru2. For large (x{greater-than or approximate}0.02) concentrations of Gd, the critical fields are re-entrant. For small (x{less-than or approximate}0.01) concentrations of Gd, the critical fields cross the pure sample critical fields and rise above them due to compensation of the externally applied magnetic field by the negative effective internal field of the magnetic impurity. Compensation occurs at relatively low fields (25 KG) in this system as a result of substantial exchange enhancement. From the concentration and critical field of the most compensated sample, we find a value for the exchange integral, J(0) = -(15+-2) meV, and a susceptibility enhancement factor in excellent agreement with EPR, specific heat and static susceptibility measurements.
AB - We have measured the upper critical field, Hc2, of alloys of the form [(La.993Lu.007)1-xGdx]Ru2. For large (x{greater-than or approximate}0.02) concentrations of Gd, the critical fields are re-entrant. For small (x{less-than or approximate}0.01) concentrations of Gd, the critical fields cross the pure sample critical fields and rise above them due to compensation of the externally applied magnetic field by the negative effective internal field of the magnetic impurity. Compensation occurs at relatively low fields (25 KG) in this system as a result of substantial exchange enhancement. From the concentration and critical field of the most compensated sample, we find a value for the exchange integral, J(0) = -(15+-2) meV, and a susceptibility enhancement factor in excellent agreement with EPR, specific heat and static susceptibility measurements.
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U2 - 10.1016/0038-1098(76)90734-1
DO - 10.1016/0038-1098(76)90734-1
M3 - Article
AN - SCOPUS:49549127987
SN - 0038-1098
VL - 20
SP - 635
EP - 638
JO - Solid State Communications
JF - Solid State Communications
IS - 7
ER -