Mendonça-Ferreira, L;
Carneiro, FB;
Fontes, MB;
Baggio-Saitovitch, E;
Veiga, LS;
Mardegan, JRL;
Strempfer, J;
... Bittar, EM; + view all
(2019)
Pressure effects on the structural and superconducting transitions in La₃Co₄Sn₁₃.
Journal of Alloys and Compounds
, 773
pp. 34-39.
10.1016/j.jallcom.2018.09.236.
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Abstract
La3Co4Sn13 is a superconducting material with transition temperature at Tc = 2.70 K, which presents a superlattice structural transition at T ∗ ≃ 150 K, a common feature for this class of compounds. However, for this material, it is not clear that at T ∗ the lattice distortions arise from a charge density wave (CDW) or from a distinct microscopic origin. Interestingly, it has been suggested in isostructural non-magnetic intermetallic compounds that T ∗ can be suppressed to zero temperature, by combining chemical and external pressure, and a quantum critical point is argued to be observed near these critical doping/pressure. Our study shows that application of pressure on single-crystalline La3Co4Sn13 enhances Tc and decreases T ∗ . We observe thermal hysteresis loops for cooling/heating cycles around T ∗ for P & 0.6 GPa, in electrical resistivity measurements, which are not seen in x-ray diffraction data. The hysteresis in electrical measurements may be due to the pinning of the CDW phase to impurities/defects, while the superlattice structural transition maintains its ambient pressure second-order transition nature under pressure. From our experiments we estimate that T ∗ vanishes at around 5.5 GPa, though no quantum critical behavior is observed up to 2.53 GPa.
| Type: | Article |
|---|---|
| Title: | Pressure effects on the structural and superconducting transitions in La₃Co₄Sn₁₃ |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1016/j.jallcom.2018.09.236 |
| Publisher version: | https://doi.org/10.1016/j.jallcom.2018.09.236 |
| Language: | English |
| Additional information: | This version is the author accepted manuscript. For information on re-use, please refer to the publisher’s terms and conditions. |
| Keywords: | Pressure effects, La₃Co₄Sn₁₃, Superconductivity, Electrical resistivity, Synchrotron x-ray diffraction |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > London Centre for Nanotechnology |
| URI: | https://discovery-pp.ucl.ac.uk/id/eprint/10085886 |
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