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Quasi-particle evidence for the nematic state above $T_{\rm{c}}$ in Sr$_x$Bi$_2$Se$_3$
Superconductivity · Submitted 24 Feb 2019
abstract compiled · 2026-09-23 · no language-model review
The authors' main claim By angle-resolved specific heat measurements, we report bulk quasi-particle evidence of nematicity in the topological superconductor Sr$_x$Bi$_2$Se$_3$.
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The abstract, sentence by sentence
In the electronic nematic state, an electronic system has a lower symmetry than the crystal structure of the same system. Electronic nematic states have been observed in various unconventional superconductors such as cuprate- and iron-based, heavy-fermion, and topological superconductors. The relation between nematicity and superconductivity is a major unsolved problem in condensed matter physics. By angle-resolved specific heat measurements, we report bulk quasi-particle evidence of nematicity in the topological superconductor Sr$_x$Bi$_2$Se$_3$. The specific heat exhibited a clear 2-fold symmetry despite the 6-fold symmetric lattice. Most importantly, the 2-fold symmetry appeared in the normal state above the superconducting transition temperature. This is explained by the angle-dependent Zeeman effect due to the anisotropic density of states in the nematic phase. Such results highlight the interrelation between nematicity and unconventional superconductivity.
background contribution method result interpretation main claim
| # | sentence | role | the authors' own work | states the main conclusion | strength |
|---|---|---|---|---|---|
| s0 | In the electronic nematic state, an electronic system has a lower symmetry than the crystal structure of the same system. | background 1.00 | 0.03 | 0.03 | asserted 1.00 |
| s1 | Electronic nematic states have been observed in various unconventional superconductors such as cuprate- and iron-based, heavy-fermion, and topological superconductors. | background 1.00 | 0.04 | 0.02 | asserted 1.00 |
| s2 | The relation between nematicity and superconductivity is a major unsolved problem in condensed matter physics. | background 0.69 | 0.03 | 0.02 | asserted 1.00 |
| s3 | By angle-resolved specific heat measurements, we report bulk quasi-particle evidence of nematicity in the topological superconductor Sr$_x$Bi$_2$Se$_3$. | contribution 0.98 | 0.97 | 0.74 | asserted 1.00 |
| s4 | The specific heat exhibited a clear 2-fold symmetry despite the 6-fold symmetric lattice. | result 1.00 | 0.93 | 0.12 | asserted 1.00 |
| s5 | Most importantly, the 2-fold symmetry appeared in the normal state above the superconducting transition temperature. | result 1.00 | 0.93 | 0.66 | asserted 1.00 |
| s6 | This is explained by the angle-dependent Zeeman effect due to the anisotropic density of states in the nematic phase. | interpretation 1.00 | 0.46 | 0.09 | asserted 0.97 |
| s7 | Such results highlight the interrelation between nematicity and unconventional superconductivity. | interpretation 1.00 | 0.22 | 0.27 | asserted 0.85 |
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The paper
Original abstract
In the electronic nematic state, an electronic system has a lower symmetry than the crystal structure of the same system. Electronic nematic states have been observed in various unconventional superconductors such as cuprate- and iron-based, heavy-fermion, and topological superconductors. The relation between nematicity and superconductivity is a major unsolved problem in condensed matter physics. By angle-resolved specific heat measurements, we report bulk quasi-particle evidence of nematicity in the topological superconductor Sr$_x$Bi$_2$Se$_3$. The specific heat exhibited a clear 2-fold symmetry despite the 6-fold symmetric lattice. Most importantly, the 2-fold symmetry appeared in the normal state above the superconducting transition temperature. This is explained by the angle-dependent Zeeman effect due to the anisotropic density of states in the nematic phase. Such results highlight the interrelation between nematicity and unconventional superconductivity.
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4 arXiv papers cite this in 7 sentences
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Uses its data or values 1 paper
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For Sr however, the reported ratios in [ref] all leads to $C > 1$, violating the stability bound.].
Half Quantum Vortices in Nematic Superconductor · Ginzburg-landau Theory · 0.87
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