Real-space ordering of doped holes in La2-xSrxNiO4 is revealed in magnetic and electronic-transport anomalies at low temperatures. The ordering is most pronounced for a hole concentration nh of 1/3 below 235 K where a superlattice with a modulation wave vector δ of 1/3 has been found. For nh=1/2, another charge-ordered state with δ=0 is also indicated below ∼340 K. Our results are, furthermore, suggestive of mesoscopic hole segregation for 0.2≤x≤0.4 forming the nh=1/3 and δ=1/3 state below 235 K.
All Science Journal Classification (ASJC) codes
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics