Electronic and magnetic properties of the topological semimetal candidate NdSbTe

Abstract

ZrSiS-type materials represent a large material family with unusual coexistence of topological nonsymmorphic Dirac fermions and nodal-line fermions. As a special group of ZrSiS-family, LnSbTe (Ln = Lanthanide rare earth) compounds provide a unique opportunity to explore new quantum phases due to the intrinsic magnetism induced by Ln. Here we report the single crystal growth and characterization of NdSbTe, a previously unexplored LnSbTe compound. NdSbTe has an antiferromagnetic ground state with field-driven metamagnetic transitions similar to other known LnSbTe, but exhibits distinct enhanced electronic correlations characterized by large a Sommerfeld coefficient of 115 mJ/mol K 2 , which is the highest among

Charge density wave and weak Kondo effect in a Dirac semimetal CeSbTe

“…According to a previous study, the bulk band structure (without considering CDW) features a Dirac cone near the X point, protected by the nonsymmorphic crystal symmetry [33], i.e., the system is a Dirac semimetal. Similar Dirac cones have also been reported in isoelectronic GdSbTe [56] and NbSbTe [57]. With the observation of the CDW order, it is important to investigate how the CDW order affects the Dirac cone.…”

Magnetic Topological Semimetal Phase with Electronic Correlation Enhancement in SmSbTe

“…The magnetic property characterization of SmSbTe is presented in Figure . Similar to other LnSbTe compounds (Ln = Ce, Nd, Gd, and Ho), [ 26,40–43 ] SmSbTe displays an antiferromagnetic (AFM) order with a Néel temperature T N ≈ 3.7 ± 0.2 K. The slight variation of 0.2 K is possibly due to tiny variations in composition of the multiple crystals we measured. The probed T N is independent of magnetic field strength (Figure 2a, inset) though, a situation in stark contrast with CeSbTe and NdSbTe, where T N is suppressed upon increasing the magnetic field.…”

“…The probed T N is independent of magnetic field strength (Figure 2a, inset) though, a situation in stark contrast with CeSbTe and NdSbTe, where T N is suppressed upon increasing the magnetic field. [ 26,39,43 ] The AFM nature of the magnetic transition can be determined by the absence of irreversibility between zero‐field‐cooling (ZFC) and field‐cooling (FC) measurements in the temperature dependence of the susceptibility χ ( T ) (Figure 2a), and by the linear field dependence at low fields and below T N in isothermal magnetization M ( H ) (Figure 2b). In addition, χ ( T ) is found to follow a modified Curie–Weiss law χ mol = χ 0 + C /( T – θ ) above 20 K, where χ 0 is the temperature‐independent part of the susceptibility, C is the Curie temperature, and θ is the Weiss temperature.…”

“…Such LnSbTe materials provide a platform to further investigate exotic quantum states. [ 38–43 ] New phenomena such as Kondo effects, charge density waves (CDW), and correlation enhancement have been discovered in various LnSbTe compounds. [ 39,43,44 ] Those quantum phenomena, together with the non‐trivial topology generated by the Sb layer in LnSbTe, [ 25,26,41,45 ] offer great opportunities for exploring topological physics and for developing topological quantum material‐based devices.…”

“…The study of magnetic LnSbTe compounds is in an early stage with only few materials discovered, such as CeSbTe, GdSbTe, NdSbTe, and HoSbTe. [ 25,26,38–43,45,46 ] Here, we report the investigation of the previously unexplored SmSbTe member of the family. Our combined magnetization and specific heat measurements revealed antiferromagnetism and signatures of electronic correlation enhancement.…”