X-ray multiple-wave coherent interaction in a quasi-two-dimensional material NbSe2-2H.
The first observation of the X-ray multiple-wave interaction in an incommensurate charge-density-wave (CDW) modulated structure at low temperatures is reported for an example of a quasi-two-dimensional material, NbSe(2)-2H. Via the coherent interaction between the X-ray waves propagating in the CDW-modulated structure and the host structure, the phase-dependent intensity variations of a CDW reflection were detected. In accord with a centrosymmetric structure, the phases of the structure-factor triplets of two CDW reflections and a Bragg reflection of the host structure were determined to be either 0 or 180 degrees, and not to vary with temperature. Relative phase differences of the two CDW reflections are also deduced.
Du
Chao-Hung
CH
Department of Physics, Tamkang University, Tamsui 251, Taiwan. chd@mail.tku.edu.tw
Tang
Mau-Tsu
MT
Stetsko
Yuri P
YP
Lee
Yen-Ru
YR
Wang
Chung-Wei
CW
Cheng
Cheng-Wen
CW
Chang
Shih-Lin
SL
D018360:Crystallography, X-Ray; D008956:Models, Chemical; D009556:Niobium / Q000737:chemistry*; D018036:Selenium Compounds / Q000737:chemistry*; D013597:Systems Analysis; D013696:Temperature
D018036:Selenium Compounds; D009556:Niobium