High-energy spin fluctuation in low-Tc iron-based superconductor LaFePO0.9
Abstract
Spin fluctuations are widely believed to play an important role in the superconducting mechanisms of unconventional high temperature superconductors. Spin fluctuations have been observed in iron-based superconductors as well. However, in some iron-based superconductors such as LaFePO0.9, they have not been observed by inelastic neutron scattering (INS). LaFePO0.9 is an iron-based superconductor with a low superconducting transition temperature (Tc= 5 K), where line nodes are observed in the superconducting gap function. The line-node symmetry typically originates from sign reversal of the order parameter in spin-fluctuation-mediated superconductivity. This contradiction has been a long-standing mystery of this superconductor. Herein, spin fluctuations were found at high energies such as 30–50 meV with comparable intensities to an optimally doped LaFeAs(O, F). Based on this finding, the line-node symmetry can be explained naturally as spin-fluctuation-mediated superconductivity.
- Authors:
-
[1];
[2];
[2];
[3];
- Comprehensive Research Organization for Science and Society (CROSS), Ibaraki (Japan); Japan Atomic Energy Agency (JAEA), Ibaraki (Japan); National Institute of Advanced Industrial Science and Technology (AIST), Ibaraki (Japan)
- Japan Atomic Energy Agency (JAEA), Ibaraki (Japan)
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
- Institut Laue-Langevin (ILL), Grenoble Cedex (France)
- Publication Date:
- Research Org.:
- Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Basic Energy Sciences (BES)
- OSTI Identifier:
- 1523760
- Grant/Contract Number:
- AC05-00OR22725
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Scientific Reports
- Additional Journal Information:
- Journal Volume: 8; Journal Issue: 1; Journal ID: ISSN 2045-2322
- Publisher:
- Nature Publishing Group
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY
Citation Formats
Ishikado, Motoyuki, Shamoto, Shin-ichi, Kodama, Katsuaki, Kajimoto, Ryoichi, Nakamura, Mitsutaka, Hong, Tao, and Mutka, Hannu. High-energy spin fluctuation in low-Tc iron-based superconductor LaFePO0.9. United States: N. p., 2018.
Web. doi:10.1038/s41598-018-33878-x.
Ishikado, Motoyuki, Shamoto, Shin-ichi, Kodama, Katsuaki, Kajimoto, Ryoichi, Nakamura, Mitsutaka, Hong, Tao, & Mutka, Hannu. High-energy spin fluctuation in low-Tc iron-based superconductor LaFePO0.9. United States. https://doi.org/10.1038/s41598-018-33878-x
Ishikado, Motoyuki, Shamoto, Shin-ichi, Kodama, Katsuaki, Kajimoto, Ryoichi, Nakamura, Mitsutaka, Hong, Tao, and Mutka, Hannu. Mon .
"High-energy spin fluctuation in low-Tc iron-based superconductor LaFePO0.9". United States. https://doi.org/10.1038/s41598-018-33878-x. https://www.osti.gov/servlets/purl/1523760.
@article{osti_1523760,
title = {High-energy spin fluctuation in low-Tc iron-based superconductor LaFePO0.9},
author = {Ishikado, Motoyuki and Shamoto, Shin-ichi and Kodama, Katsuaki and Kajimoto, Ryoichi and Nakamura, Mitsutaka and Hong, Tao and Mutka, Hannu},
abstractNote = {Spin fluctuations are widely believed to play an important role in the superconducting mechanisms of unconventional high temperature superconductors. Spin fluctuations have been observed in iron-based superconductors as well. However, in some iron-based superconductors such as LaFePO0.9, they have not been observed by inelastic neutron scattering (INS). LaFePO0.9 is an iron-based superconductor with a low superconducting transition temperature (Tc= 5 K), where line nodes are observed in the superconducting gap function. The line-node symmetry typically originates from sign reversal of the order parameter in spin-fluctuation-mediated superconductivity. This contradiction has been a long-standing mystery of this superconductor. Herein, spin fluctuations were found at high energies such as 30–50 meV with comparable intensities to an optimally doped LaFeAs(O, F). Based on this finding, the line-node symmetry can be explained naturally as spin-fluctuation-mediated superconductivity.},
doi = {10.1038/s41598-018-33878-x},
journal = {Scientific Reports},
number = 1,
volume = 8,
place = {United States},
year = {Mon Nov 05 00:00:00 EST 2018},
month = {Mon Nov 05 00:00:00 EST 2018}
}
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Figures / Tables:
Figure 1: Magnetic susceptibilities (a) and X-ray diffraction patterns (b) of measured powder samples of LaFePO0.9 and LaFeAsO0.918F0.082. Zero field cooling (ZFC) and field cooling (FC) processes are shown in (a) by arrows with solid and broken lines, respectively. The diffraction pattern of LaFePO0.9 is vertically shifted for clarity.
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Works referencing / citing this record:
High- iron phosphide superconductivity enhanced by reemergent antiferromagnetic spin fluctuations in probed by NMR
journal, September 2019
- Sakano, F.; Nakamura, K.; Kouchi, T.
- Physical Review B, Vol. 100, Issue 9
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