Evidence of a structural quantum critical point in (CaxSr1-x)3Rh4Sn13 from a lattice dynamics study
| cam.issuedOnline | 2018-10-04 | |
| datacite.issupplementedby.url | https://doi.org/10.17863/CAM.31763 | |
| dc.contributor.author | Cheung, YW | |
| dc.contributor.author | Hu, YJ | |
| dc.contributor.author | Imai, M | |
| dc.contributor.author | Tanioku, Y | |
| dc.contributor.author | Kanagawa, H | |
| dc.contributor.author | Murakawa, J | |
| dc.contributor.author | Moriyama, K | |
| dc.contributor.author | Zhang, W | |
| dc.contributor.author | Lai, KT | |
| dc.contributor.author | Yoshimura, K | |
| dc.contributor.author | Grosche, FM | |
| dc.contributor.author | Kaneko, K | |
| dc.contributor.author | Tsutsui, S | |
| dc.contributor.author | Goh, SK | |
| dc.contributor.orcid | Grosche, Malte [0000-0002-3912-9819] | |
| dc.date.accessioned | 2018-12-08T00:30:30Z | |
| dc.date.available | 2018-12-08T00:30:30Z | |
| dc.date.issued | 2018 | |
| dc.description.abstract | Approaching a quantum critical point (QCP) has been an effective route to stabilize superconductivity. While the role of magnetic QCPs has been extensively discussed, similar exploration of a structural QCP is scarce due to the lack of suitable systems with a continuous structural transition that can be conveniently tuned to 0~K. Using inelastic X-ray scattering, we examine the phonon spectrum of the nonmagnetic quasi-skutterudite (Ca$_{x}$Sr$_{1-x}$)$_3$Rh$_4$Sn$_{13}$, which represents a precious system to explore the interplay between structural instabilities and superconductivity by tuning the Ca concentration $x$. We unambiguously detect the softening of phonon modes around the M point on cooling towards the structural transition. Intriguingly, at $x=0.85$, the soft mode energy squared at the M point extrapolates to zero at $(-5.7 \pm 7.7)$~K, providing the first compelling microscopic evidence of a structural QCP in (Ca$_{x}$Sr$_{1-x}$)$_3$Rh$_4$Sn$_{13}$. The enhanced phonon density-of-states at low energy provides the essential ingredient for realizing strong-coupling superconductivity near the structural QCP. | |
| dc.identifier.doi | 10.17863/CAM.33819 | |
| dc.identifier.eissn | 2469-9969 | |
| dc.identifier.issn | 2469-9950 | |
| dc.identifier.uri | https://www.repository.cam.ac.uk/handle/1810/286509 | |
| dc.language.iso | eng | |
| dc.publisher | American Physical Society (APS) | |
| dc.publisher.url | http://dx.doi.org/10.1103/PhysRevB.98.161103 | |
| dc.subject | cond-mat.supr-con | |
| dc.subject | cond-mat.supr-con | |
| dc.subject | cond-mat.str-el | |
| dc.title | Evidence of a structural quantum critical point in (CaxSr1-x)3Rh4Sn13 from a lattice dynamics study | |
| dc.type | Article | |
| dcterms.dateAccepted | 2018-09-21 | |
| prism.issueIdentifier | 16 | |
| prism.publicationDate | 2018 | |
| prism.publicationName | Physical Review B | |
| prism.volume | 98 | |
| rioxxterms.licenseref.startdate | 2018-10-04 | |
| rioxxterms.licenseref.uri | http://www.rioxx.net/licenses/all-rights-reserved | |
| rioxxterms.type | Journal Article/Review | |
| rioxxterms.version | AM | |
| rioxxterms.versionofrecord | 10.1103/PhysRevB.98.161103 |
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