An unusual hollow cylindrical Fermi surface of a quasi-two-dimensional compound CeAgSb₂

Electronic structure of LaAgSb2 and CeAgSb2 studied by high-resolution angle-resolved photoemission spectroscopy

“…We found hole-like FS centered at the G(Z) point, in good agreement with the hole pocket in the band calculation of LaAgSb 2 [3,4].…”

“…High-quality single crystals of LaAgSb 2 and CeAgSb 2 were grown by the self-flux method [3]. ARPES measurements were performed with GAMMADATA-SCIENTA SES-2002 spectrometer with a high-flux helium discharging lamp and a toroidal grating monochromator at Tohoku University.…”

“…Rare-earth intermetallic compounds RAgSb 2 (R: rare earth) have attracted much attention as they show interesting physical properties such as magnetic ordering and anisotropic transport [1][2][3]. RAgSb 2 crystallizes in a tetragonal structure, and planes of Ag atoms intercalate into the unit cell of the respective CeSb 2 with a stacking sequence of CeSb-Sb-CeSb-Ag layers, showing a quasitwo-dimensional character with anisotropic transport properties [1][2][3].…”

“…RAgSb 2 crystallizes in a tetragonal structure, and planes of Ag atoms intercalate into the unit cell of the respective CeSb 2 with a stacking sequence of CeSb-Sb-CeSb-Ag layers, showing a quasitwo-dimensional character with anisotropic transport properties [1][2][3]. It has been reported that CeAgSb 2 shows a ferromagnetic transition at T C ¼ 9.7 K with a relatively small net ferromagnetic moment (0.4 m B per Ce atom), simultaneously accompanied with a sharp drop in the electrical resistivity [1][2][3]. On the other hand, in nonmagnetic LaAgSb 2 , the resistivity and magnetization show a distinct anomaly at about 210 K [1], suggesting a possible charge-density-wave (CDW) or spin-density-wave (SDW) formation below this temperature.…”

Structure and magnetic properties of the REAuBi2 (RE=La–Nd, Sm) phases

“…This is the case for the RETX 2 compounds when X is either Sb or Bi. Examples include strong magnetic anisotropy and a magnetic field-induced quantum critical point (QCP) in CeAuSb 2 [4] ferromagnetism in the Kondo lattice systems CeNiSb 2 and CeAgSb 2 [5,6], quasi 2D fermions and quantum magnetoresistance in LaAgBi 2 [7], superconductivity in LaPd 1 À x Bi 2 [8], heavy fermion behavior in CeTBi 2 (T ¼Ni, Cu, Ag) [9], and a compound recently reported as CeAu 0.92 Bi 1.6 [10]. Typically, Cebased ternary intermetallic systems are most studied due to the potential for heavy-fermion superconductivity (like CeCoIn 5 [11] and CeIrIn 5 [12]), Ce valence fluctuation, and interesting magnetism from electron correlations; as such there have been several studies on CeTSb 2 and CeTBi 2 (T¼ Mn, Fe, Co, Ni, Cu, Zn, Pd, Ag, Au) systems [9,13,14].…”