TITLE

Structural, electrical, magnetic, and thermal studies of Cr-doped La0.7Ca0.3Mn1-xCrxO3 (0≤x≤1) manganites

AUTHOR(S)
Kumar, Neeraj; Kishan, H.; Rao, Ashok; Awana, V. P. S.
PUB. DATE
April 2010
SOURCE
Journal of Applied Physics;Apr2010, Vol. 107 Issue 8, p083905
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
We report detailed structural, electrical, magnetic, and specific heat studies on La0.7Ca0.3Mn1-xCrxO3 manganites. Rietveld analysis of fitted and observed x-ray diffraction patterns exhibited the single-phase nature of all the studied materials, which crystallize in Pbnm space group. Successive substitution of Cr at Mn-site in La0.7Ca0.3Mn1-xCrxO3 manganites increases the electrical resistivity and decreases the characteristic insulator-metal transition temperature (TIM) of the parent compound along with a humplike feature for higher Cr-content (x>0.06) samples. The hump structure basically signifies the onset of antiferromagnetic (AFM) interactions as inferred by both the magnetic and infrared (IR) spectroscopy studies. The systematic suppression of FM state results in a spin glass (SG)-like behavior. IR studies revealed that the vibration mode at 413 cm-1 being associated with internal bending of MnO6 octahedra, becomes softer, indicating an increase in distortion and hence the possible SG behavior. The critical exponents (α, β, and γ) are calculated from the heat capacity (CP) data near the TIM/TFM. The same exhibited variations of their values with doping. In particular, the value of β increases from 0.37(x=0.0) to 0.43(x=0.04), clearly indicating the coexistence of both long and short range magnetic orders, i.e., tendency toward SG state for Cr-doped samples. On the basis of present results, it is suggested that Cr dilutes double-exchange based FM and rather promotes the AFM based superexchange interactions via Cr3+/Mn4+ ions. Substitution of Cr systematically destroys both the metallic state and long range FM order.
ACCESSION #
50175843

 

Related Articles

  • Specific heat and magnetic order of La0.2Ca0.8MnO3. Markovich, V.; Wieckowski, J.; Gutowska, M.; Szewczyk, A.; Wisniewski, A.; Martin, C.; Gorodetsky, G. // Journal of Applied Physics;Mar2010, Vol. 107 Issue 6, p063907 

    Measurements of specific heat of the electron-doped La0.2Ca0.8MnO3 manganite are reported for 2

  • Domain mapping of a Ca-doped manganite. Turner, Joshua J.; Jordan-Sweet, Jean L.; Upton, Mary; Hill, John P.; Tokura, Yoshinori; Tomioka, Yasuhide; Kevan, Stephen D. // Applied Physics Letters;3/31/2008, Vol. 92 Issue 13, p131907 

    We have performed microdiffraction experiments to map the crystallographic domain structure of the Ca-doped manganite Pr0.5Ca0.5MnO3 by microfocusing x-rays through a glass capillary. Domain structure on the order of a few microns is observed. We suggest that this finding implies that the...

  • Structure and magnetism of the manganite LaMnO3 with defects. Chukalkin, Yu. G.; Teplykh, A. E. // Physics of the Solid State;Dec2006, Vol. 48 Issue 12, p2310 

    The structural and magnetic states of LaMnO3 samples containing various concentrations of antisite defects created by fast-neutron irradiation were studied by neutron diffraction, x-ray diffraction, and magnetic measurements. It is found that the static uncorrelated displacements of oxygen ions...

  • Anisotropic strain-stress state and intermixing in epitaxial Mo(110)/Ni(111) multilayers: An x-ray diffraction study. Abadias, G.; Debelle, A.; Michel, A.; Jaouen, C.; Martin, F.; Pacaud, J. // Journal of Applied Physics;Jan2010, Vol. 107 Issue 2, p023515 

    The present study deals with the analysis of elastic strains and stresses in high-quality heteroepitaxial Mo/Ni superlattices with periods Λ lying in the range 4.8–27.6 nm. The strain-stress state in this lattice-mismatched system grown under energetic deposition conditions (ion beam...

  • MN SUBSTITUTION EFFECT ON THE STRUCTURAL AND MAGNETIC PROPERTIES IN La0.54Ho0.11Sr0.35Mn1-xVxO3 MANGANITES. Craus, Mihail-Liviu; Simkin, Valeryi; Cornei, Nicoleta; Dobrea, Viorel // Progress of Cryogenics & Isotopes Separation;2010, Vol. 13 Issue 1, p47 

    Manganites, as La1-xSrxMnO3, are known as ferromagnetic materials, with a "bad metal" behavior, and a transition temperature close to Curie temperature. The manganites with La0.54Ho0.11Sr0.35Mn1-xVxO3 were prepared by means of sol-gel methods. The treated samples were monitorized by XRD, while...

  • Structural, Magnetic And Electrical Properties Of Mg Doped La0.75Sr0.25MnO3 Manganite. Kameli, P.; Salamati, H.; Heidarian, A. // AIP Conference Proceedings;4/24/2008, Vol. 1003 Issue 1, p163 

    In this study, the effect of Mg substitution on the structural, magnetic and electrical properties of La0.75Sr0.25-xMgxMnO3 are investigated by XRD, Ac susceptibility and electrical resistivity measurements. The results show that by increasing Mg doping level, the paramagnetic-ferromagnetic and...

  • Investigation of A-site La substituted BaTi0.96Mn0.04O3 ceramics: Searching for ferromagnetic origin. Gaoshang Gong; Yujiao Fang; Zerihun, Gebru; Chongyang Yin; Shuai Huang; Songliu Yuan // Journal of Applied Physics;2014, Vol. 115 Issue 24, p243902-1 

    Ba1-xLaxTi0.96Mn0.04O3 ceramics (x=0, 3%, 7%) were prepared by a modified Pechini method and the structure, morphology, magnetic and electric properties have been investigated. X-ray diffraction analysis reveals La3+ ions could suppress the formation of hexagonal phase effectively. The cell...

  • In situ observation of secondary phase formation in Fe implanted GaN annealed in low pressure N2 atmosphere. Talut, G.; Grenzer, J.; Reuther, H.; Shalimov, A.; Baehtz, C.; Novikov, D.; Walz, B. // Applied Physics Letters;12/7/2009, Vol. 95 Issue 23, p232506 

    The formation of secondary phases in Fe implanted GaN upon annealing in low pressure N2-atmosphere was detected by means of in situ x-ray diffraction and confirmed by magnetization measurements. A repeatable phase change from Fe3N at room temperature and Fe3-xN at 1023 K was observed in situ....

  • Unusual electronic transport properties in La[sub 0.96-x]Nd[sub x]K[sub 0.04]MnO[sub 3]. Guo, Yongquan; Roy, Sujoy; Ali, Naushad; Zhang, Xinhui; Wäppling, Roger // Journal of Applied Physics;5/15/2003, Vol. 93 Issue 10, p8089 

    Polycrystalline La[SUB0.96-x]Nd[SUB-x]K[SUB0.04]MnO[SUB3] has been studied by means of x-ray powder diffraction, dc magnetization, and electrical resistance measurement. La[SUB0.96-x]Nd[SUBx]K[SUB0.04]MnO[SUB3] initially crystallizes in a rhombohedral distorted perovskite structure. However, an...

Share

Read the Article

Courtesy of THE LIBRARY OF VIRGINIA

Sorry, but this item is not currently available from your library.

Try another library?
Sign out of this library

Other Topics