| CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES |
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Thermal conductivity in near-nodal superconductors |
| Hui Meng1, Huan Zhang1, Wan-Sheng Wang2, Qiang-Hua Wang1,3** |
1National Laboratory of Solid State Microstructures & School of Physics, Nanjing University, Nanjing 210093
2Department of Physics, Ningbo University, Ningbo 315211
3Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing 210093
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| Cite this article: |
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Hui Meng, Huan Zhang, Wan-Sheng Wang et al 2018 Chin. Phys. Lett. 35 127402 |
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Abstract The universal behavior of thermal conductivity at low temperatures is usually taken as the signature of gap nodes in superconductors. Here we show that in near-nodal superconductors the thermal conductivity obeys a two-parameter scaling law, and can develop super-universal behavior if the temperature is about half the gap minimum. However, when the temperature is fixed at about one quarter of the gap minimum, the thermal conductivity can develop a dip versus the scattering rate, which is in excellent agreement with the behavior of the experimental thermal conductivity in Sr$_2$RuO$_4$. Our theory is useful to correctly analyze the thermal conductivity in any near-nodal superconductor.
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Received: 16 October 2018
Published: 23 November 2018
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| PACS: |
74.25.fc
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(Electric and thermal conductivity)
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74.20.-z
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(Theories and models of superconducting state)
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74.20.Rp
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(Pairing symmetries (other than s-wave))
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| Fund: Supported by the National Key Research and Development Program of China under Grant No 2016YFA0300401, and the National Natural Science Foundation of China under Grant Nos 11574134 and 11604168. |
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