Specific heat and magnetic order in LaMnO_{3+δ}

Abstract

Magnetic and specific-heat measurements are performed in three different samples of LaMnO_{3+δ}, with δ=0.11, 0.15 and 0.26, presenting important disorder effects, such as carrier localization, due to high amounts of La and Mn vacancies. For the samples with δ=0.11 and 0.15, magnetic measurements show signatures of a two-step transition: as the temperature is lowered, the system enters a ferromagnetic phase followed by a disorder-induced cluster-glass state. Spin-wave-like contributions and an unexpected large linear term are observed in the specific heat as a function of temperature. In the sample with the highest vacancy content, δ=0.26, the disorder is sufficient to suppress even short-range ferromagnetic order and yield a spin-glass-like state.

RevTeX 2-col, 8 pages, 5 ps figures included, submitted to PRB

Cited by in corpus (16)

• Specific heat and magnetization study on single crystals of a frustrated, quasi one-dimensional oxide: Ca3Co2O6
• Anomalous field-dependent specific heat in charge-ordered Pr${}_{1-x}$Ca${}_x$MnO${}_3$ and La${}_{0.5}$Ca${}_{0.5}$MnO${}_3$
• Specific heat and magnetic measurements in Nd0.5Sr0.5MnO3, Nd0.5Ca0.5MnO3 and Ho0.5Ca0.5MnO3 samples
• Specific heat at low temperatures and magnetic measurements in Nd0.5Sr0.5MnO3 and R0.5Ca0.5MnO3 (Nd, Sm, Dy and Ho) samples
• Magnetic phases evolution in the LaMn1-xFexO3+y system
• Specific heat study of single crystalline Pr${}_{0.63}$ Ca${}_{0.37}$ MnO${}_3$ in presence of a magnetic field
• Hyperfine and crystal field interactions in multiferroic HoCrO${}_3$
• The magnetic and electronic properties of Oxyselenides - influence of transition metal ions and lanthanides
• Ferromagnetic insulating state in manganites:55Mn study
• Local polarization in oxygen-deficient LaMnO${}_3$ induced by charge localization in the Jahn-Teller distorted structure
• Large magnetoresistance in low temperature metallic region of manganite compounds (La0.7-2xEux)(Ca0.3Srx)MnO3 (0.05<x<0.15)
• Disorder effects at low temperatures in La_{0.7-x}Y_{x}Ca_{0.3}MnO_{3} manganites
• Spectral evolution in an insulator exhibiting linear specific heat
• Low-temperature specific heat of La0.78Pb0.22MnO3-d manganite
• Polaronic Heat Capacity in The Anderson - Hasegawa Model
• Frustrated Metastable Behavior of Magnetic and Transport Properties in Charge Ordered La1-xCaxMnO3+d Manganites