Anomalous scaling of Δ C versus T c in the Fe-based superconductors: the $${S}_{\pm }$$-wave pairing state model
Abstract
The strong power law behavior of the specific heat jump $${\rm{\Delta }}C\;$$ versus T c $$({\rm{\Delta }}C/{T}_{{\rm{c}}}\sim {T}_{{\rm{c}}}^{\alpha },\alpha \approx 2)$$, first observed by Bud'ko et al (2009 Phys. Rev. B 79 220516), has been confirmed with several families of the Fe-based superconducting compounds with various dopings. We tested a minimal two band BCS model to understand this anomalous behavior and showed that this non-BCS relation between $${\rm{\Delta }}C\;$$ versus T c is a generic property of the multiband superconducting state paired by a dominant interband interaction ($${V}_{\mathrm{inter}}\gt {V}_{\mathrm{intra}}$$) reflecting the relation $$\frac{{{\rm{\Delta }}}_{{\rm{h}}}}{{{\rm{\Delta }}}_{{\rm{e}}}}\sim \sqrt{\frac{{N}_{{\rm{e}}}}{{N}_{{\rm{h}}}}}$$ near T c, as in the $${S}_{\pm }$$-wave pairing state. We also found that this $${\rm{\Delta }}C\;$$ versus T c power law can continuously change from the ideal BNC scaling to a considerable deviation by a moderate variation of the impurity scattering rate $${{\rm{\Gamma }}}_{0}$$ (non-pair-breaking). Finally, as a result, our model provides a consistent explanation why the electron-doped Fe-based superconductors follow the ideal BNC scaling very well while the hole-doped systems often show varying degree of deviations.
- Authors:
- Publication Date:
- Research Org.:
- Univ. of Florida, Gainesville, FL (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Basic Energy Sciences (BES)
- OSTI Identifier:
- 1236522
- Alternate Identifier(s):
- OSTI ID: 1236523; OSTI ID: 1254478
- Grant/Contract Number:
- FG02-86ER45268; 2013-R1A1A2-057535
- Resource Type:
- Published Article
- Journal Name:
- New Journal of Physics
- Additional Journal Information:
- Journal Name: New Journal of Physics Journal Volume: 18 Journal Issue: 2; Journal ID: ISSN 1367-2630
- Publisher:
- IOP Publishing
- Country of Publication:
- United Kingdom
- Language:
- English
- Subject:
- 71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; Fe-based superconductors; specific heat jump versus Tc,BNC scailing, S±-pairing state, two band model
Citation Formats
Bang, Yunkyu, and Stewart, G. R. Anomalous scaling of Δ C versus T c in the Fe-based superconductors: the ${S}_{\pm }$-wave pairing state model. United Kingdom: N. p., 2016.
Web. doi:10.1088/1367-2630/18/2/023017.
Bang, Yunkyu, & Stewart, G. R. Anomalous scaling of Δ C versus T c in the Fe-based superconductors: the ${S}_{\pm }$-wave pairing state model. United Kingdom. https://doi.org/10.1088/1367-2630/18/2/023017
Bang, Yunkyu, and Stewart, G. R. Mon .
"Anomalous scaling of Δ C versus T c in the Fe-based superconductors: the ${S}_{\pm }$-wave pairing state model". United Kingdom. https://doi.org/10.1088/1367-2630/18/2/023017.
@article{osti_1236522,
title = {Anomalous scaling of Δ C versus T c in the Fe-based superconductors: the ${S}_{\pm }$-wave pairing state model},
author = {Bang, Yunkyu and Stewart, G. R.},
abstractNote = {The strong power law behavior of the specific heat jump ${\rm{\Delta }}C\;$ versus T c $({\rm{\Delta }}C/{T}_{{\rm{c}}}\sim {T}_{{\rm{c}}}^{\alpha },\alpha \approx 2)$, first observed by Bud'ko et al (2009 Phys. Rev. B 79 220516), has been confirmed with several families of the Fe-based superconducting compounds with various dopings. We tested a minimal two band BCS model to understand this anomalous behavior and showed that this non-BCS relation between ${\rm{\Delta }}C\;$ versus T c is a generic property of the multiband superconducting state paired by a dominant interband interaction (${V}_{\mathrm{inter}}\gt {V}_{\mathrm{intra}}$) reflecting the relation $\frac{{{\rm{\Delta }}}_{{\rm{h}}}}{{{\rm{\Delta }}}_{{\rm{e}}}}\sim \sqrt{\frac{{N}_{{\rm{e}}}}{{N}_{{\rm{h}}}}}$ near T c, as in the ${S}_{\pm }$-wave pairing state. We also found that this ${\rm{\Delta }}C\;$ versus T c power law can continuously change from the ideal BNC scaling to a considerable deviation by a moderate variation of the impurity scattering rate ${{\rm{\Gamma }}}_{0}$ (non-pair-breaking). Finally, as a result, our model provides a consistent explanation why the electron-doped Fe-based superconductors follow the ideal BNC scaling very well while the hole-doped systems often show varying degree of deviations.},
doi = {10.1088/1367-2630/18/2/023017},
journal = {New Journal of Physics},
number = 2,
volume = 18,
place = {United Kingdom},
year = {Mon Feb 01 00:00:00 EST 2016},
month = {Mon Feb 01 00:00:00 EST 2016}
}
https://doi.org/10.1088/1367-2630/18/2/023017
Web of Science
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