Evidence of electronic phase separation in Er[sup 3+]-doped La[sub 0.8]Sr[sub 0.2]MnO[sub 3]

Ravindranath, V.; Rao, M. S. Ramachandra; Suryanarayanan, R.; Rangarajan, G.
April 2003
Applied Physics Letters;4/28/2003, Vol. 82 Issue 17, p2865
Academic Journal
Er[SUP3+] doping at the La site in La[SUB0.8]Sr[SUB0.2]MnO[SUB3] showed an unusual increase in Curie/peak resistivity temperature (T[SUBC]/T[SUBP]) above a certain nominal dopant concentration (x ⩾ 0.086). This increase is attributed to the presence of a cation-deficient ErMnO[SUB3] phase. Further, with increase in T[SUBP] the overall resistivity of these compounds also decreases. We explain these results assuming the presence of a nanoscale mixture of charge-ordered antiferromagnetic insulating (CO-AFMI) phase in a ferromagnetic metallic matrix, wherein the increase in T[SUBC]/T[SUBP] with increase in Er[SUP3+] content is due to the local destruction of the CO-AFMI phase by the presence of the cation-deficient ErMnO[SUB3] phase. We thus provide an indirect evidence of electronic phase separation in these compounds.


Related Articles

  • Critical behavior of the specific heat of manganites La1-xAgxMnO3 (x=0.1,0.15,0.2) near the Curie point. Gamzatov, A. G.; Khizriev, K. Sh.; Batdalov, A. B.; Abdulvagidov, Sh. B.; Aliev, A. M.; Melnikov, O. V.; Gorbenko, O. Yu. // Low Temperature Physics;Mar2009, Vol. 35 Issue 3, p214 

    An investigation of the critical behavior of the specific heat of the manganites La1-xAgxMnO3 ×(x=0.1,0.15,0.2) near the Curie temperature is carried out. The behavior of the universal critical parameters near the phase transition point is established. All of the samples studied correspond...

  • Phase separation induced by cation disorder and strain in (La,Y)2/3(Ca,Sr)1/3MnO3 films. Cai, H. L.; Wu, X. S.; Wang, Z. H.; Lu, X. M.; Gao, J. // Journal of Applied Physics;Apr2009, Vol. 105 Issue 7, p07D714 

    Effects of cation disorder and strain on the surface morphologies and transport properties of thin films with different A-site cation disorder, which was achieved by Y and Sr codoping into La2/3Ca1/3MnO3, have been investigated. A metal-insulator transition (MIT) was observed on all films except...

  • Interfacial magnetism in CaRuO3/CaMnO3 superlattices grown on (001) SrTiO3. He, C.; Zhai, X.; Mehta, V. V.; Wong, F. J.; Suzuki, Y. // Journal of Applied Physics;Apr2011, Vol. 109 Issue 7, p07D729 

    We have studied epitaxially grown superlattices of CaRuO3/CaMnO3 as well as an alloy film of CaMn0.5Ru0.5O3 on (001) SrTiO3 substrates. In contrast to previous experiments, we have studied CRO/CMO superlattices with a constant CRO thickness and variable CMO thickness. All superlattices exhibit...

  • Lattice parameter variation and magnetization studies on titanium-, zirconium-, and tin-substituted nickel-zinc ferrites. Das, A. R.; Ananthan, V. S.; Khan, D. C. // Journal of Applied Physics;4/15/1985, Vol. 57 Issue 8, p4189 

    Presents a study which reported the variation of lattice parameter, saturation magnetization and Curie temperature on the addition of titanium, zirconium and tin to some nickel-zinc ferrite compositions. Materials and methods used; Computational approach; Results and discussion.

  • Strain of interatomic bonds and crystallochemical aspects of AB B O3 oxides with perovskite structure. Olekhnovich, N. M. // Crystallography Reports;Mar2006, Vol. 51 Issue 2, p169 

    A method for determining the strain characteristics of interatomic bonds in crystals of ternary oxides AB B O3 with perovskite structure, i.e., AB B O3 ( B″ = Nb, Ta, Sb, Re, or Bi) and AB B O3 ( B″ = Mo, W, Re, Os, or U), is developed. A linear relationship is established between...

  • Structural and electromagnetic characteristics of perovskites in La1-c-xSrc+xMn1-xMe4+xO3 systems (Me=Ge, Ti). Badelin, A.; Datskaya, Z.; Epifanova, I.; Estemirova, S.; Karpasyuk, V.; Smirnov, A. // EPJ Web of Conferences;2013, Issue 40, p15004-p.1 

    Experimental data are shown for the influence of substituting quadrivalent ions on the concentration phase transitions "rhombohedral-orthorhombic structure" and "semiconductor-metal" in ceramic manganites of specifically designed system La3+1-c-xSr2+c+xMn4+1-c-xMn4+cMe4+xO3 (c=0.15, 0.17, 0.19;...

  • Curie temperature of Nd[sub 0.7](Ca, Sr, Ba)[sub 0.3]MnO[sub 3], as determined by electron-spin resonance. Zhou, S. M.; Yoshizawa, M.; Lou, P.; Jin, S. Z.; Zhang, Y. H. // Journal of Applied Physics;3/15/2001, Vol. 89 Issue 6, p3377 

    A paramagnetic-ferromagnetic transition has been observed in detail by electron-spin resonance (ESR) around the Curie temperature in a series of Nd[sub 0.7](Ca, Sr, Ba)[sub 0.3]MnO[sub 3] with a fixed A-site mean radius =1.21 Å. As A-site cation disorder σ[sup 2] increases, the...

  • Can cation vacancy defects induce room temperature ferromagnetism in GaN? Wang, Xiaopeng; Zhao, Mingwen; He, Tao; Wang, Zhenhai; Liu, Xiangdong // Applied Physics Letters;2/11/2013, Vol. 102 Issue 6, p062411 

    The unique properties of gallium nitride (GaN) crystal, such as a wide band-gap and high thermal conductivity, make it ideal material for electronic and optoelectronic devices. Achieving room temperature (RT) ferromagnetism in GaN becomes crucial. In previous works, gallium vacancy (VGa) was...

  • Strong correlation between the cation ordering and magnetic properties of anodically electrodeposited Mn-Co-O nanocrystals. Weifeng Wei; Mehmet Egilmez; Weixing Chen; Jung, Jan A.; Ivey, Douglas G. // Journal of Materials Science;Dec2010, Vol. 45 Issue 24, p6824 

    The rock salt-to-spinel structural transformation that occurs in anodically electrodeposited Mn-Co-O nanocrystals involves a rearrangement of Mn/Co cations from octahedral interstices to tetrahedral interstices. The cation ordering process leads to distinct magnetic properties. Curie temperature...


Read the Article


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

Try another library?
Sign out of this library

Other Topics