195Pt-NMR evidence for opening of partial charge-density-wave gap in layered LAPt2Si2 with CaBe2Ge2 structure

Taisuke Aoyama, Tetsuro Kubo, Haruki Matsuno, Hisashi Kotegawa, Hideki Tou, Akihiro Mitsuda, Yutaro Nagano, Nobutaka Araoka, Hirofumi Wada, Yuh Yamada

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Abstract

We carried out 195Pt-NMR measurements for a single-crystal LaPt2Si2, which is expected to show the coexistence of a superconducting state and a charge density wave (CDW) state. LaPt2Si2 crystallizes to a quasi-two-dimensional CaBe2Ge2-type crystal structure consisting of two types of Pt2Si2 layers: Pt1 and Pt2. From both the Knight shift, 195K, and the NMR relaxation rate divided by the temperature, 1=T1T, the electronic density of states at the Fermi level, N(εF), for only the Pt1 site decreases below the CDW transition temperature T+ = 112 K, whereas N(εF) for the Pt2 site does not change. These results suggest that the CDW occurs only in the Pt1 layers below 112 K. Furthermore, above T+, we also found that both195K and 1=T1T decrease upon cooling only for the Pt1 site. The temperature dependences of K and 1=T1T for the Pt1 site can be explained by assuming a two bands model consisting of a wide band and a narrow band near the Fermi level. The CDW transition is expected to occur only in the narrow band of the Pt1 site, while the wide band of the Pt1-site does not contribute to the CDW transition. The present result strongly indicates that the CDW gap opens partially at the Fermi surface.

Original languageEnglish
Article number124713
Journaljournal of the physical society of japan
Volume87
Issue number12
DOIs
Publication statusPublished - Jan 1 2018

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

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