Anomalous impurity effect in the heavy-fermion superconductor CeCu$_2$Si$_2$
Recent observations of contradictory impurity effect in the heavy-fermion superconductor CeCu$_2$Si$_2$ at ambient pressure have hindered the identification of its pairing symmetry. Here we perform theoretical analyses with both intraband and interband impurity scatterings for the nodeless $s^\pm$-wave pairing, and report an anomalous nonmonotonic variation of its $T_c$ suppression with the scattering strength. Our results reproduce the prominent reduction of $T_c$ in good agreement with earlier experiments by atomic substitution and explains as well its robustness against electron irradiation. We ascribe the latter to the screening of the interband impurity potential in the strong scattering or unitary region. This resolves the seeming contradiction in different experimental probes and provides an important support to the nodeless $s^\pm$-wave scenario in CeCu$_2$Si$_2$ at ambient pressure. Our theory may be extended to other narrow band systems such as twisted bilayer graphene and the recently discovered bilayer or trilayer nickelate superconductors, and provide a useful way to distinguish different paring candidates thereof..
| Medienart: |
|
|---|
Preprint| Erscheinungsjahr: |
2024 |
|---|---|
| Erschienen: |
2024 |
| Enthalten in: |
arXiv.org - (2024) vom: 03. März Zur Gesamtaufnahme - year:2024 |
|---|
| Sprache: |
Englisch |
|---|
| Beteiligte Personen: |
Zhao, Shan [VerfasserIn] |
|---|
| Links: |
Volltext [kostenfrei] |
|---|
| Themen: |
530 |
|---|
| Förderinstitution / Projekttitel: |
|
|---|
| PPN (Katalog-ID): |
XCH042772443 |
|---|
| LEADER | 01000naa a22002652 4500 | ||
|---|---|---|---|
| 001 | XCH042772443 | ||
| 003 | DE-627 | ||
| 005 | 20240306114456.0 | ||
| 007 | cr uuu---uuuuu | ||
| 008 | 240306s2024 xx |||||o 00| ||eng c | ||
| 035 | |a (DE-627)XCH042772443 | ||
| 035 | |a (chemrXiv)2403.01455 | ||
| 040 | |a DE-627 |b ger |c DE-627 |e rakwb | ||
| 041 | |a eng | ||
| 100 | 1 | |a Zhao, Shan |e verfasserin |4 aut | |
| 245 | 1 | 0 | |a Anomalous impurity effect in the heavy-fermion superconductor CeCu$_2$Si$_2$ |
| 264 | 1 | |c 2024 | |
| 336 | |a Text |b txt |2 rdacontent | ||
| 337 | |a Computermedien |b c |2 rdamedia | ||
| 338 | |a Online-Ressource |b cr |2 rdacarrier | ||
| 520 | |a Recent observations of contradictory impurity effect in the heavy-fermion superconductor CeCu$_2$Si$_2$ at ambient pressure have hindered the identification of its pairing symmetry. Here we perform theoretical analyses with both intraband and interband impurity scatterings for the nodeless $s^\pm$-wave pairing, and report an anomalous nonmonotonic variation of its $T_c$ suppression with the scattering strength. Our results reproduce the prominent reduction of $T_c$ in good agreement with earlier experiments by atomic substitution and explains as well its robustness against electron irradiation. We ascribe the latter to the screening of the interband impurity potential in the strong scattering or unitary region. This resolves the seeming contradiction in different experimental probes and provides an important support to the nodeless $s^\pm$-wave scenario in CeCu$_2$Si$_2$ at ambient pressure. Our theory may be extended to other narrow band systems such as twisted bilayer graphene and the recently discovered bilayer or trilayer nickelate superconductors, and provide a useful way to distinguish different paring candidates thereof. | ||
| 650 | 4 | |a Physics - Superconductivity |7 (dpeaa)DE-84 | |
| 650 | 4 | |a Physics - Strongly Correlated Electrons |7 (dpeaa)DE-84 | |
| 650 | 4 | |a 530 |7 (dpeaa)DE-84 | |
| 700 | 1 | |a Liu, Weifu |4 aut | |
| 700 | 1 | |a Yang, Yi-feng |4 aut | |
| 700 | 1 | |a Feng, Shiping |4 aut | |
| 700 | 1 | |a Liu, Bin |4 aut | |
| 773 | 0 | 8 | |i Enthalten in |t arXiv.org |g (2024) vom: 03. März |
| 773 | 1 | 8 | |g year:2024 |g day:03 |g month:03 |
| 856 | 4 | 0 | |u https://arxiv.org/abs/2403.01455 |z kostenfrei |3 Volltext |
| 912 | |a GBV_XCH | ||
| 951 | |a AR | ||
| 952 | |j 2024 |b 03 |c 03 | ||