195Pt-NMR Evidence for Opening of Partial Charge-Density-Wave Gap in Layered LaPt2Si2with CaBe2Ge2Structure

Aoyama, Tomohiro; Kubo, T.; Matsuno, Haruki; Kotegawa, Hisashi; Tou, Hideki; Mitsuda, Akihiro; Nagano, Yutaro; Araoka, Nobutaka; Wada, Hirohumi; Yamada, Yuh

doi:10.7566/jpsj.87.124713

Cited by 5 publications

(1 citation statement)

References 14 publications

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“…First principles calculations suggest that the Fermi surface of LaPt 2 Si 2 is quasi twodimensional, and that there is coexistence of CDW order and SC in the [Si2-Pt1-Si2] layer [23,24]. The coexistence of the two orders and a partially opened CDW gap on the Fermi surface were confirmed by nuclear magnetic resonance (NMR) experiments [25]. µSR measurements of LaPt 2 Si 2 indicate that the superconductivity is well described by a two-gap s-wave model rather than a single isotropic gap [26].…”

Section: Introductionmentioning

confidence: 89%

Evolution of charge density wave order and superconductivity under pressure in LaPt2Si2

Shen

et al. 2020

Phys. Rev. B

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We report measurements of the electrical resistivity and ac magnetic susceptibility of single crystalline LaPt2Si2 under pressure, in order to investigate the interplay of superconductivity and CDW order. LaPt2Si2 exhibits a first order phase transition from a tetragonal to orthorhombic structure, accompanied by the onset of CDW order below TCDW = 76 K, while superconductivity occurs at a lower temperature of Tc = 1.87 K. We find that the application of pressure initially suppresses the CDW transition, but enhances Tc. At pressures above 2.4 GPa, CDW order vanishes, while both Tc and the resistivity A-coefficient reach a maximum value around this pressure. Our results suggest that the occurrence of a superconducting dome can be accounted for within the framework of BCS theory, where there is a maximum in the density of states upon the closure of the CDW gap.

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Section: Introductionmentioning

confidence: 89%

Evolution of charge density wave order and superconductivity under pressure in LaPt2Si2

Shen

et al. 2020

Phys. Rev. B

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Q-dependent electron-phonon coupling induced phonon softening and non-conventional critical behavior in the CDW superconductor LaPt2Si2

Nocerino,

Stuhr,

San Lorenzo

et al. 2023

Journal of Science: Advanced Materials and Devices

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Multiple unconventional charge density wave transitions in LaPt2Si2 superconductor clarified with high-energy X-ray diffraction

Nocerino,

Sanlorenzo,

Papadopoulos

et al. 2023

Commun Mater

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The quasi-2D platinum-based rare earth intermetallic LaPt2Si2 has attracted attention as it exhibits strong interplay between charge density wave order and superconductivity. However, most of the results reported on this material come from theoretical calculations, preliminary bulk investigations and powder samples, which makes it difficult to uniquely determine the temperature evolution of its crystal structure and, consequently, of its charge density wave transition. Therefore, the published literature around LaPt2Si2 is often controversial. Here, by means of high-resolution synchrotron X-ray diffraction data, we clarify some of the poorly or partially understood aspects of the physics of LaPt2Si2. In particular, we resolve the complex evolution of its crystal structure and superstructures, identifying the temperature dependence of multiple density wave transitions in good quality LaPt2Si2 single crystals. According to our findings, on cooling from room temperature LaPt2Si2 undergoes a series of subtle structural transitions which can be summarised as follows: second order commensurate tetragonal (P4/nmm)-to-incommensurate structure followed by a first order incommensurate-to-commensurate orthorhombic (Pmmn) transition and then a first order commensurate orthorhombic (Pmmn)-to-commensurate tetragonal (P4/nmm). The structural transitions are accompanied by both incommensurate and commensurate superstructural distortions of the lattice. The observed behavior is compatible with discommensuration of the CDW in this material.

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¹⁹⁵Pt-NMR Evidence for Opening of Partial Charge-Density-Wave Gap in Layered LaPt₂Si₂with CaBe₂Ge₂Structure

Cited by 5 publications

References 14 publications

Evolution of charge density wave order and superconductivity under pressure in LaPt2Si2

Evolution of charge density wave order and superconductivity under pressure in LaPt2Si2

Q-dependent electron-phonon coupling induced phonon softening and non-conventional critical behavior in the CDW superconductor LaPt2Si2

Multiple unconventional charge density wave transitions in LaPt2Si2 superconductor clarified with high-energy X-ray diffraction

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