Phase diagram of the La$_{1-x}$Ca$_{x}$MnO$_{3}$ compound for $0.5\leq x\leq 0.9$

M. Pissas; G. Kallias

doi:10.1103/PhysRevB.68.134414

paper

Phase diagram of the La $_{1 - x}$ Ca $_{x}$ MnO $_{3}$ compound for $0.5 \leq x \leq 0.9$

arXiv:cond-mat/0205410 · doi:10.1103/PhysRevB.68.134414

Abstract

We have studied the phase diagram of La $_{1 - x}$ Ca $_{x}$ MnO $_{3}$ for $0.5 \leq x \leq 0.9$ using neutron powder diffraction and magnetization measurements. At 300 K all samples are paramagnetic and single phase with crystallographic symmetry $P nma$ . As the temperature is reduced a structural transition is observed which is to a charge-ordered state only for certain x. On further cooling the material passes to an antiferromagnetic ground state with Neel temperature $T_{N}$ that depends on x. For $0.8 \leq x \leq 0.9$ the structural transformation occurs at the same temperature as the magnetic transition. Overall, the neutron diffraction patterns were explained by considering four phase boundaries for which La $_{1 - x}$ Ca $_{x}$ MnO $_{3}$ forms a distinct phase: the CE phase at $x = 0.5 - 0.55$ , the charge-ordered phase at x=2/3, the monoclinic and C-type magnetic structure at $x = 0.80 - 0.85$ and the G-type magnetic structure at x=1. Between these phase boundaries the magnetic reflections suggest the existence of mixed compounds containing both phases of the adjacent phase boundaries in a ratio determined by the lever rule.

Phase diagram of the La $_{1 - x}$ Ca $_{x}$ MnO $_{3}$ compound for $0.5 \leq x \leq 0.9$

Abstract

References in corpus (3)

Cited by in corpus (11)

Phase diagram of the La1−x​Cax​MnO3​ compound for 0.5≤x≤0.9

Abstract

References in corpus (3)

Cited by in corpus (11)

Phase diagram of the La $_{1 - x}$ Ca $_{x}$ MnO $_{3}$ compound for $0.5 \leq x \leq 0.9$