Saved in:
| Main Authors: | , , , , , , , , , , , , |
|---|---|
| Format: | Preprint |
| Published: |
2019
|
| Subjects: | |
| Online Access: | https://arxiv.org/abs/1905.01702 |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| _version_ | 1866912583718535168 |
|---|---|
| author | Cho, Chang-woo Shen, Junying Lyu, Jian Atanov, Omargeldi Chen, Qianxue Lee, Seng Huat Hor, Yew San Gawryluk, Dariusz Jakub Pomjakushina, Ekaterina Bartkowiak, Marek Hecker, Matthias Schmalian, Jörg Lortz, Rolf |
| author_facet | Cho, Chang-woo Shen, Junying Lyu, Jian Atanov, Omargeldi Chen, Qianxue Lee, Seng Huat Hor, Yew San Gawryluk, Dariusz Jakub Pomjakushina, Ekaterina Bartkowiak, Marek Hecker, Matthias Schmalian, Jörg Lortz, Rolf |
| contents | A state of matter with a multi-component order parameter can give rise to vestigial order. In the vestigial phase, the primary order is only partially melted, leaving a remaining symmetry breaking behind, an effect driven by strong classical or quantum fluctuations. Vestigial states due to primary spin and charge-density-wave order have been discussed in the context of iron-based and cuprate materials. Here we present the observation of a partially melted superconductor in which pairing fluctuations condense at a separate phase transition and form a nematic state with broken Z3, i.e. three-state Potts-model symmetry. High-resolution thermal expansion, specific heat and magnetization measurements of the doped topological insulator NbxBi2Se3 reveal that this symmetry breaking occurs at Tnem=3.8 K above Tc=3.25 K, along with an onset of superconducting fluctuations. Thus, before Cooper pairs establish long-range coherence at Tc, they fluctuate in a way that breaks the rotational invariance at Tnem and induces a distortion of the crystalline lattice. Similar results are found for CuxBi2Se3. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_1905_01702 |
| institution | arXiv |
| publishDate | 2019 |
| record_format | arxiv |
| spellingShingle | $Z_3$-vestigial nematic order due to superconducting fluctuations in the doped topological insulator Nb$_x$Bi$_2$Se$_3$ and Cu$_x$Bi$_2$Se$_3$ Cho, Chang-woo Shen, Junying Lyu, Jian Atanov, Omargeldi Chen, Qianxue Lee, Seng Huat Hor, Yew San Gawryluk, Dariusz Jakub Pomjakushina, Ekaterina Bartkowiak, Marek Hecker, Matthias Schmalian, Jörg Lortz, Rolf Superconductivity A state of matter with a multi-component order parameter can give rise to vestigial order. In the vestigial phase, the primary order is only partially melted, leaving a remaining symmetry breaking behind, an effect driven by strong classical or quantum fluctuations. Vestigial states due to primary spin and charge-density-wave order have been discussed in the context of iron-based and cuprate materials. Here we present the observation of a partially melted superconductor in which pairing fluctuations condense at a separate phase transition and form a nematic state with broken Z3, i.e. three-state Potts-model symmetry. High-resolution thermal expansion, specific heat and magnetization measurements of the doped topological insulator NbxBi2Se3 reveal that this symmetry breaking occurs at Tnem=3.8 K above Tc=3.25 K, along with an onset of superconducting fluctuations. Thus, before Cooper pairs establish long-range coherence at Tc, they fluctuate in a way that breaks the rotational invariance at Tnem and induces a distortion of the crystalline lattice. Similar results are found for CuxBi2Se3. |
| title | $Z_3$-vestigial nematic order due to superconducting fluctuations in the doped topological insulator Nb$_x$Bi$_2$Se$_3$ and Cu$_x$Bi$_2$Se$_3$ |
| topic | Superconductivity |
| url | https://arxiv.org/abs/1905.01702 |