Superconducting Transition Temperatures and Transport Properties of LaFe1-yRuyAsO0.89F0.11 and LaFeAsO0.89-xF0.11+x
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概要
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The transport behaviors and superconducting transition temperatures $T_{\text{c}}$ of the title systems have been experimentally studied for various $x$ and $y$ values. Together with results reported previously by our group, data are now available for many sets of samples of RFe1-yMyAsO0.89F0.11 with $\text{R} = \text{La}$ and Nd and $\text{M} = \text{Co}$, Mn and Ru and for RFeAsO0.89-xF0.11+x. Dopings of Co and Mn atoms introduce electrons and holes into the FeAs planes, respectively. They also introduce, more or less, randomness effects. Ru atoms introduce scattering centers within the FeAs planes without changing the number of carrier electrons or holes. In contrast, F atoms introduce electron carriers, but not randomness effects or scattering centers into the FeAs planes. From these studies, we can conclude that there are two appreciable mechanisms of $T_{\text{c}}$ suppression by the dopings. The disappearance of or reduction in the area of the hole Fermi surfaces around the $\Gamma$ point in the reciprocal space has been clearly shown as one of the mechanisms, irrespective of whether or not doped atoms are within the conducting planes. The other mechanism is the electron localization observed for the Mn doping. The rates of the $T_{\text{c}}$ suppression due to the scattering by nonmagnetic Ru and Co atoms have been found to be negligible compared with that expected from the pair breaking theory, indicating that the systems do not have the $S_{\pm}$ symmetry of the superconducting order parameter.
- Physical Society of Japanの論文
- 2010-09-15
著者
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Satomi Erika
Department Of Physics Division Of Material Science Nagoya University
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Kobayashi Yoshiaki
Department Of Physics Division Of Material Science Nagoya University
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Sato Masatoshi
Department Of Agro-environmental Science Obihiro University Of Agriculture And Veterinary Medicine
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LEE Sang
Department of Acupuncture & Moxibustion, College of Oriental Medicine, Kyung Hee University
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Satomi Erika
Department of Physics, Division of Material Science, Nagoya University, Furocho, Chikusa-ku, Nagoya 464-8602, Japan
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Lee Sang
Department of Physics, Division of Material Science, Nagoya University, Furocho, Chikusa-ku, Nagoya 464-8602, Japan
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