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Partial Conductivity of YSZ Doped with 10 mol% $TiO_2$
Kobayashi, Kiyoshi,Kai, Yukiharu,Yamaguchi, Shu,Kawashima, Tsuyoshi,Iguchi, Yoshiaki The Korean Ceramic Society 1998 The Korean journal of ceramics Vol.4 No.2
Using Hebb-Wagner's asymmetric cell, partial conductivities of holes and electrons in yttria stabilized zirconia doped with 10 mol% TiO2 have been estimated by a dc polarization measurement. The current interrruption method and ac impedance measurements have been also made to evaluate the ionic conductivity and to examine the consistency of the partial conductivities. Partial conductivities of electrons(σn) and holes (σp) were found to be pro-peortional to -1/4 and 1/4 power of partial pressure of oxygen gas, respectively, except for σn at reducing conditions. In comparison with 5 mol% doped YSZ, σn was found to increase with the increase of TiO2 concentration, but σp stayed at almost a constant value.
Takayoshi Kouchi,Kyohei Yoshinaga,Tomoya Asano,Mitsuharu Yashima,Hidekazu Mukuda,Sotaro Nishioka,Tsuyoshi Kawashima,Shigeki Miyasaka,Akira Iyo 한국물리학회 2023 새물리 Vol.73 No.12
We performed isotope <SUP>121,123</SUP>Sb-NMR studies to investigate the role of nematic fluctuations for superconductivity in Sb-substituted iron-based compounds LaFe(As<SUB>1-x</SUB>Sb<SUB>x</SUB>)O<SUB>1-y</SUB>F<SUB>y</SUB>. The temperature(T) dependence of nuclear spin relaxation rate(1=T₁) of <SUP>121,123</SUP>Sb were measured in the parent compound LaFe(As<SUB>0.6</SUB>Sb<SUB>0.4</SUB>)O(F0Sb40) and the lightly electron doped LaFe(As<SUB>0.7</SUB>Sb<SUB>0.3</SUB>)O<SUB>0.9</SUB>F<SUB>0.1</SUB>(F10Sb30). In the F0Sb40, the <SUP>121,123</SUP>(1=T₁) were enhanced upon cooling toward structural transition temperature (T<SUB>s</SUB> ~ 135 K) and show a peak at T<SUB>s</SUB>. The isotopic ratio (<SUP>123</SUP>T₁<SUP>-1</SUP> /<SUP>121</SUP>T₁<SUP>-1</SUP> ) reveals that the electric quadrupole relaxation originated from the dynamics of electric field gradient at Sb site is enhanced toward Ts. It is due to the presence of critically enhanced nematic fluctuations of the stripe-type order of Fe-3d<SUB>xz</SUB> (or 3d<SUB>yz</SUB>) orbitals. In the F10Sb30(T<SUB>c</SUB> ~ 20 K), the nematic fluctuations were significantly suppressed, but it remains a small enhancement below 80 K while keeping the C₄ symmetry. These results suggested that the orbital degrees of freedom remain even in the tetragonal structure of the lightly electron doped superconducting phase (SC1) of La1111 compounds. Here, we discuss the contribution of nematic fluctuations in Fe-pnictide superconductivity by mean of the electric quadrupole moment of isotope <SUP>121,123</SUP>Sb nuclei.