paper

Magnetism and Correlated Electrons in LaCr $_{2}$ Ge $_{2}$ N

arXiv:2512.20843 · doi:10.1103/2twh-qbdn

Abstract

We report the synthesis, structure and physical properties of a new quaternary nitride LaCr $_{2}$ Ge $_{2}$ N. The compound crystallizes in the CeCr $_{2}$ Si $_{2}$ C-type structure (P4/mmm), featuring distinctive Cr $_{2}$ N square sheets within Cr $_{2}$ Ge $_{2}$ N block layers. Physical characterizations reveal enhanced electron correlations evidenced by a Sommerfeld coefficient substantially larger than band calculations and pressure-induced deviation from Fermi-liquid behavior. Magnetic measurements show short-range antiferromagnetic correlations developing around 460 K, followed by long-range magnetic ordering at 14 K. Additionally, subtle anomalies at 378 K suggest possible electronic ordering. First-principles calculations reveal nearly-flat Cr-3d bands near the Fermi level and predict a striped antiferromagnetic ground state. This work demonstrates how electron count variation in the CeCr $_{2}$ Si $_{2}$ C-type structure family leads to magnetic ordering in LaCr $_{2}$ Ge $_{2}$ N, contrasting with the paramagnetic behavior of LnCr $_{2}$ Si $_{2}$ C compounds.

8 pages, 5 figures, 3 tables. Accepted for publication in Physical Review B

Magnetism and Correlated Electrons in LaCr2​Ge2​N

Abstract

Magnetism and Correlated Electrons in LaCr $_{2}$ Ge $_{2}$ N