Abstract
The authors have experimentally observed both charge-density-wave and quantum Hall effect in bulk CaCu${}_{4}$\penalty1000\-\allowhyphens{}As${}_{2}$, where two-dimensional parallel conduction channels play an important role in transport properties.
Highlights
Low-dimensional layered materials manifest an inherent tendency towards the formation of symmetry reduced charge density wave (CDW) states with exotic properties
Temperature-dependent single-crystal x-ray diffraction in conjunction with thermodynamic and transport measurements reveal that CaCu4As2 undergoes a structural or CDW transition below 51 K
The quantum Hall effect (QHE) [1,2] and charge density wave (CDW) [3,4,5] are exotic physical properties that are generally observed in low-dimensional systems
Summary
The sharp drop in the resistivity is first-order-like, as confirmed from the observed hysteresis [inset of Fig. 2(c)]. This drop in resistivity occurs due to a structural/CDW transition. (d) For I [0001] and B [12 ̄10], in the presence of an applied magnetic field, below 51 K, the figure shows a slight increase in resistivity with decreasing temperatures, as is typically observed in CDW systems. From the temperature dependence of the oscillation amplitude, we find the effective mass m∗ as 0.28 ± 0.02 me [Inset of Fig. 3(b)]. The obtained value of vF is in close agreement with the estimated values in the ab-plane of KCu4As2 and SrCu4As2, where a similar type of corrugated cylindrical Fermi pockets reveal the 2D character [24]
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
