NMR studies of coexistence of superconductivity and CDW in LaPt2Si2

International Conference on Strongly Correlated Electron Systems 2016

Aoyama, Taisuke^1 ; Kubo, Tetsuro^1 ; Matsuno, Haruki^1 ; Kotegawa, Hisashi^1 ; Tou, Hideki^1 ; Mitsuda, Akihiro^2 ; Nagano, Yutaro^2 ; Araoka, Nobutaka^2 ; Wada, Hirohumi^2 ; Yamada, Yuh^3

Department of Physics, Kobe University, Hyogo, Kobe

657-8501, Japan^1

Department of Physics, Kyushu University, Fukuoka

819-0395, Japan^2

Department of Physics, Niigata University, Niigata

950-2181, Japan^3

关键词: Charge density wave state;    Knight shifts;    NMR measurements;    NMR spectrum;    Polycrystalline powders;    Single-crystalline;    Superconducting state;    Temperature dependence;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/807/6/062002/pdf
DOI  :  10.1088/1742-6596/807/6/062002

来源: IOP

【 摘 要 】

We carried out139La-,29Si- and195Pt-NMR measurements of LaPt2Si2which shows coexistence of a superconducting state and a charge density wave (CDW) state. Slight gradual decreasing ∼0.006% are observed in Knight shifts of139La and29Si-line C from 200K to 5K. The decreasing are much less than the previous195Pt-NMR spectra PeakD's shifts reported in T. Kubo et al, so the decreasing can be expected following195Pt-Knight shift decreasing. LaPt2Si2has two types of Pt-sites: Pt(1)2a(Wycoff position) and Pt(2)2c. By carrying out single crystalline195Pt-NMR, the site assignments of195Pt-NMR spectra to each respective Pt sites are succeeded for both H||a and ||c. Associating for 1/T1T results for polycrystalline powder reported by T. Kubo et al, Pt(1)-site may contributes to the CDW order below T∗. It is necessary to measure the temperature dependences of line1's 1/T1T by using single crystalline LaPt2Si2.