TY - JOUR
T1 - Effect of substituting Fe and Ru for Ni on the thermopower of MgCNi3
AU - Sulkowski, C.
AU - Klimczuk, T.
AU - Cava, R. J.
AU - Rogacki, K.
N1 - Copyright:
Copyright 2007 Elsevier B.V., All rights reserved.
PY - 2007/8/1
Y1 - 2007/8/1
N2 - The intermetallic perovskite MgCNi3 is a superconductor with a Tc =7 K. Substitution of Fe and Ru for Ni decreases Tc monotonically as the doping concentration is increased. Here we report thermopower measurements S(T) on MgCNi3, MgCNi3-x Fex, and MgCNi3-x Rux. For MgCNi3 the thermopower is negative, -12.5 μV/K, at 300 K. The absolute value of S decreases as x increases in MgCNi3-x Fex and MgCNi3-x Rux. The sign of S changes from negative to positive at low temperatures for values of x>0.01. These data show that the carriers in MgCNi3 are electrons, and by increasing x and decreasing temperature, the participation of hole carriers clearly increases. The influence of the magnetic moments of the Fe atoms on the thermopower is not visible.
AB - The intermetallic perovskite MgCNi3 is a superconductor with a Tc =7 K. Substitution of Fe and Ru for Ni decreases Tc monotonically as the doping concentration is increased. Here we report thermopower measurements S(T) on MgCNi3, MgCNi3-x Fex, and MgCNi3-x Rux. For MgCNi3 the thermopower is negative, -12.5 μV/K, at 300 K. The absolute value of S decreases as x increases in MgCNi3-x Fex and MgCNi3-x Rux. The sign of S changes from negative to positive at low temperatures for values of x>0.01. These data show that the carriers in MgCNi3 are electrons, and by increasing x and decreasing temperature, the participation of hole carriers clearly increases. The influence of the magnetic moments of the Fe atoms on the thermopower is not visible.
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U2 - 10.1103/PhysRevB.76.060501
DO - 10.1103/PhysRevB.76.060501
M3 - Article
AN - SCOPUS:34547561287
SN - 1098-0121
VL - 76
JO - Physical Review B - Condensed Matter and Materials Physics
JF - Physical Review B - Condensed Matter and Materials Physics
IS - 6
M1 - 060501
ER -