期刊
JOURNAL OF ALLOYS AND COMPOUNDS
卷 773, 期 -, 页码 34-39出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2018.09.236
关键词
Pressure effects; La3Co4Sn13; Superconductivity; Electrical resistivity; Synchrotron x-ray diffraction
资金
- Fundacao Carlos Chagas Filho de Amparo a Pesquisa do Estado do Rio de Janeiro (FAPERJ) [E-26/010.001045/2015]
- Conselho Nacional de Desenvlovimento Cientifico e Tecnologico (CNPq) [400633/2016-7]
- Fundacao de Amparo a Pesquisa do Estado de Sao Paulo (FAPESP) [2011/19924-2, 2012/04870-7]
La3Co4Sn13 is a superconducting material with transition temperature at T-c = 2.70 K, which presents a superlattice structural transition at T* similar or equal to 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 T-c and decreases T*. We observe thermal hysteresis loops for cooling/heating cycles around T* for P greater than or similar to 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. (C) 2018 Elsevier B.V. All rights reserved.
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