On the superconducting symmetry of Fe-based systems — Impurity effect studies and neutron scattering measurements-
Abstract
To identify the superconducting symmetry of Fe-based superconductors, we studied effects of nonmagnetic-impurities on Tc, magnetic excitation spectra x" and NMR 1/T1 - T curve, which are sensitive to the relative signs between the order parameters on the disconnected Fermi surfaces in reciprocal space, because the symmetry is closely connected with the pairing mechanism: If the signs are opposite (symmetry S±), the mechanism is considered to be a magnetic one, but when the signs are the same (symmetry S++), a novel mechanism is plausible because the ordinary phonon mechanism cannot realize the Tc value as high as ~55 K found in Ln1111 (Ln=lanthanide). Results are as follows: (a) The very small rates of Tc-suppression by impurity atoms M of LnFe1-yMyAs0.89-xF0.11+x (M=Ni, Co, Ru) can be explained only by S++. (b) The x"-data for Ba(Fe, Co)2As2 (Tc ~ 23 K) and Ca-Fe-Pt-As crystals seem to be well explained by S++ rather than by S±. (c) The nuclear magnetic resonance data can be consistently understood by S++, too. These results suggest the S++ symmetry and a novel pairing mechanism, which can be considered to be related to the elastic softening of C66 induced by the orbital fluctuation of the system.
- Authors:
-
- Comprehensive Research Organization for Science and Society, Ibaraki (Japan); Nagoya Univ. (Japan). Graduate School of Science
- Nagoya Univ. (Japan)
- Comprehensive Research Organization for Science and Society, Ibaraki (Japan)
- Japan Atomic Energy Agency (JAEA), Ibaraki (Japan)
- Centre CEA of Saclay (France)
- Publication Date:
- Research Org.:
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). High Flux Isotope Reactor (HFIR); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Spallation Neutron Source (SNS)
- Sponsoring Org.:
- USDOE Office of Science (SC)
- OSTI Identifier:
- 1319154
- Grant/Contract Number:
- AC05-00OR22725
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Journal of the Korean Physical Society
- Additional Journal Information:
- Journal Volume: 62; Journal Issue: 12; Journal ID: ISSN 0374-4884
- Publisher:
- Korean Physical Society
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; 47 OTHER INSTRUMENTATION; Fe pnictide superconductors; magnetic excitation spectra; superconducting symmetry; impurity effects; NMR
Citation Formats
Sato, Masatoshi, Kobayashi, Yoshiaki, Kawamata, Takayuki, Yasui, Yukio, Suzuki, Kazunori, Itoh, M., Kajimoto, Ryoichi, Ikeuchi, Kazuhiko, Arai, M., and Bourges, Phillipe. On the superconducting symmetry of Fe-based systems — Impurity effect studies and neutron scattering measurements-. United States: N. p., 2013.
Web. doi:10.3938/jkps.62.1726.
Sato, Masatoshi, Kobayashi, Yoshiaki, Kawamata, Takayuki, Yasui, Yukio, Suzuki, Kazunori, Itoh, M., Kajimoto, Ryoichi, Ikeuchi, Kazuhiko, Arai, M., & Bourges, Phillipe. On the superconducting symmetry of Fe-based systems — Impurity effect studies and neutron scattering measurements-. United States. https://doi.org/10.3938/jkps.62.1726
Sato, Masatoshi, Kobayashi, Yoshiaki, Kawamata, Takayuki, Yasui, Yukio, Suzuki, Kazunori, Itoh, M., Kajimoto, Ryoichi, Ikeuchi, Kazuhiko, Arai, M., and Bourges, Phillipe. Tue .
"On the superconducting symmetry of Fe-based systems — Impurity effect studies and neutron scattering measurements-". United States. https://doi.org/10.3938/jkps.62.1726. https://www.osti.gov/servlets/purl/1319154.
@article{osti_1319154,
title = {On the superconducting symmetry of Fe-based systems — Impurity effect studies and neutron scattering measurements-},
author = {Sato, Masatoshi and Kobayashi, Yoshiaki and Kawamata, Takayuki and Yasui, Yukio and Suzuki, Kazunori and Itoh, M. and Kajimoto, Ryoichi and Ikeuchi, Kazuhiko and Arai, M. and Bourges, Phillipe},
abstractNote = {To identify the superconducting symmetry of Fe-based superconductors, we studied effects of nonmagnetic-impurities on Tc, magnetic excitation spectra x" and NMR 1/T1 - T curve, which are sensitive to the relative signs between the order parameters on the disconnected Fermi surfaces in reciprocal space, because the symmetry is closely connected with the pairing mechanism: If the signs are opposite (symmetry S±), the mechanism is considered to be a magnetic one, but when the signs are the same (symmetry S++), a novel mechanism is plausible because the ordinary phonon mechanism cannot realize the Tc value as high as ~55 K found in Ln1111 (Ln=lanthanide). Results are as follows: (a) The very small rates of Tc-suppression by impurity atoms M of LnFe1-yMyAs0.89-xF0.11+x (M=Ni, Co, Ru) can be explained only by S++. (b) The x"-data for Ba(Fe, Co)2As2 (Tc ~ 23 K) and Ca-Fe-Pt-As crystals seem to be well explained by S++ rather than by S±. (c) The nuclear magnetic resonance data can be consistently understood by S++, too. These results suggest the S++ symmetry and a novel pairing mechanism, which can be considered to be related to the elastic softening of C66 induced by the orbital fluctuation of the system.},
doi = {10.3938/jkps.62.1726},
journal = {Journal of the Korean Physical Society},
number = 12,
volume = 62,
place = {United States},
year = {Tue Jul 09 00:00:00 EDT 2013},
month = {Tue Jul 09 00:00:00 EDT 2013}
}
Web of Science