摘要本文主要研究了2H.FexNbSe2单晶样品的输运性质和磁性质。Fe掺杂对2H.NbSe2的超导转变和电荷密度波(CDW)转变都产生压制作用,并且对CDW的压制更明显。实验中发现在最小掺杂浓度x=0.002时已不能在电阻率曲线上观察到CDW转变,但在x=0.005时还可以看到超导相变(从2H-NbSe2中的7K降为5K)。本次实验Fe掺杂浓度在0....
ARPESFermi surfaceSuperconducting gapWe have studied the Fermi surface (FS) and superconducting gap of 2H-NbSe2, using angle-resolved photoemission spectroscopy with an energy resolution of 2.2 meV and an angle resolution of ±0.13°. We succeeded in distinguishing all FS sheets predicted from band...
We have used the triple-axis neutron-scattering technique to study 2H-TaSe2 and 2H-NbSe2 which undergo charge-density wave transitions at T0=122.3 K and T0=33.5 K, respectively. The transitions in both compounds appear to be second-order and involve atomic displacements of Σ1 symmetry. ...
Fig. 4: The temperature dependence of 2H-TaSe2 and 2H-NbSe2 plasmons. a The temperature evolution of the plasmon spectra of 2H-TaSe2 (sample T4, W = 700 nm, d = 20 nm) above TC1. b Same as a but below TC1. c The temperature-dependent plasmon spectra of 2H-NbSe2...
Electrical transport properties in 2H-NbS2, -NbSe2, -TaS2 and -TaSe2 Detailed measurements of the resistivity and the Hall coefficient have been made on high-quality single crystals of 2metallic transition-metal dichalcogenides between 4.2 K and 300 K, in order to investigate the carrier scatter...
We conduct Angle Resolved Photoemission Spectroscopy (ARPES) investigation on 2H-TaS2, a prototypical incommensurate Charge Density Wave (CDW) material. A comparative study of the low-energy electronic structures of 2H-TaS2 and two other related compounds, 2H-TaSe2 and 2H-NbSe2, identies several...
ARPESWe have studied the Fermi surface (FS) and superconducting gap of 2H-NbSe2, using angle-resolved photoemission spectroscopy with an energy resolution of 2.2 meV and an angle resolution of ±0.13°. We succeeded in distinguishing all FS sheets predicted from band calculations and found ...