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Journal ArticleDOI

Electron spin resonance and magnetic phase transitions in manganite perovskite La 0.78Sr 0.22MnO 3 synthesized by the solid-phase reaction method

27 Jun 2018-Functional Materials (Co. Ltd. Ukrinformnauka)-Vol. 25, Iss: 2, pp 241-245

AboutThis article is published in Functional Materials.The article was published on 2018-06-27 and is currently open access. It has received 1 citation(s) till now. The article focuses on the topic(s): Perovskite (structure) & Manganite.

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 )     
6 7 8
678+    
  
,       
#  678
    
6U
/D

6U

0Q2

    
)99(40 5+   , 

6U
)
[
/ 0 +     
    )
[
+  
     
      $ % :
    ;
    
  
  
"6 7 8" 
       
 
 ([SHULPHQWDO
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 
/D

6U

0Q2
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-     
 ,  
7
/
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S
=     
      $92%
>   
).6&?.6&?
     +
     
 
/D

6U

0Q2

@    &   @
  -   
       2(
0
µ
  9000  @
 0000    
   & 
     ;
  #  
 ! 
/D

6U

0Q2
  :  #
678 
7
/ 40 5
/D

6U

0Q2
   
   - 
 
×
 
×
0 
, 
    
 
×
 
×
0 
,  
     
     
 $4% &   
K
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
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+
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       
    - 
 678  , # 
   A<!6.8 
     < !
- <0! $0%
,   
  678 20 5 3
7
3
00 5       
   
×
9 

    
.#$%/0"1# &! #$ 2 3 $& !'" (4 '&("# & #5 
)-)  !"#$ %#!&'#$(
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  )@ + ,
     
   *  , 
     678
    @ 
5HVXOWV DQG GLVFXVVLRQ
6#     
 99(40 5   
*   9( B'-  
   
     *
@     678 
    # 
   
,
/
,
)
I
+  !  
 @     
*
I
708

+
708
  
 
+D
/ 0 C 
  *  
   #   $%
&  #   
 
+D
   
  #     
    
$(% !    
   
I
708
)
+
708
+
    
    
 '   
    #
     
       
       
 
+
 ,   
  
+
708
( C
   
 
,    
    , 
    
    )
+
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      
*   (0 B'-+
    
  ,  )+  678
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  @ 
D     
 *     
  )@ + ! 
  $%   
)    - 
 +     
    
J R  T 
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   !   
      678 
   , 
     
  $1 9%    
        
   ,
     
    
    
   )  #  $2%+
&     #  
-       
   
#   "  "
   ,   ) $
2%    + 
    )E+  
 )!+  
      
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   * 
  '  
       &
    
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       
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+   
    
  ,   
     
  #  
  ,   $4% 
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      
;     
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   
      
  &  
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  ,  
    
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     
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Citations
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Journal ArticleDOI
Abstract: The effect partially replacing neodymium with barium or strontium has on the thermal behavior of Nd0.85A0.15MnO3 (A = Ba, Sr) manganites is investigated. The temperature aspects of the transformation of their crystalline structure under different pressures of an oxygen atmosphere are studied. The sequence of phase transformations during the thermal dissociation of the compounds under reduced oxygen pressure, their thermodynamic characteristics, and the changes in the standard enthalpy and entropy of the formation of compounds from elements are determined. It is established that the partial substitution of neodymium with barium or strontium affects the thermodynamic state of the Nd–Mn–O system.

1 citations


References
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Journal ArticleDOI
Abstract: We have performed electron spin resonance (ESR) and dc susceptibility measurements in Mn perovskites up to 1000 K. Assuming an effective Heisenberg-like interaction for ${\mathrm{Mn}}^{3+}\mathrm{\ensuremath{-}}{\mathrm{Mn}}^{4+}$ spin pairs, the dc susceptibility, ${\ensuremath{\chi}}_{\mathrm{dc}}(T),$ is well described in the paramagnetic regime by the constant coupling approximation. Absolute determination of the ESR intensity indicates that all Mn spins contribute to the ESR line in the temperature range studied. The ESR linewidth can be described by $\ensuremath{\Delta}{H}_{\mathrm{pp}}(T)=\ensuremath{\Delta}{H}_{\mathrm{pp}}(\ensuremath{\infty})[C/T{\ensuremath{\chi}}_{\mathrm{dc}}(T)],$ thus presenting a universal behavior in a temperature scale normalized to ${T}_{c}.$ A single relaxation mechanism, related to spin-only interactions, explains the $T$ dependence of $\ensuremath{\Delta}{H}_{\mathrm{pp}}(T)$ for all the compounds studied: ${\mathrm{La}}_{0.67}{\mathrm{Ca}}_{0.33}{\mathrm{MnO}}_{3},$ ${\mathrm{La}}_{0.67}{\mathrm{Sr}}_{0.33}{\mathrm{MnO}}_{3},$ ${\mathrm{Pr}}_{0.67}{\mathrm{Sr}}_{0.33}{\mathrm{MnO}}_{3},$ and ${\mathrm{La}}_{0.67}{\mathrm{Pb}}_{0.33}{\mathrm{MnO}}_{3}.$ The dc susceptibility and the ESR linewidth and intensity all reflect the progressive importance of magnetic clustering below $\ensuremath{\approx}{2T}_{c}.$

222 citations


Journal ArticleDOI
Abstract: For clinical hyperthermia treatment the heating efficiency of magnetic nanoparticle ensembles is a crucial element. Using efficient algorithms, this heating is studied numerically with a focus on the effects of dipole-dipole interparticle interactions. For the time evolution of realistically modeled systems an approach based on the Landau-Lifschitz-Gilbert equation of motion with Langevin dynamics is taken. Our results suggest a widely negative influence of dipole-dipole interactions on the heating power of nanoparticles . However, considering ensembles within a fixed, given sample volume an optimal particle density exists. The presented results may have important implications for the medical use of magnetic hyperthermia treatment. I. INTRODUCTION

150 citations


Journal ArticleDOI
Abstract: In this work, we study borate glasses doped with a low concentration of iron oxide by X band (9.5 GHz) electron magnetic resonance. These glasses (composition: 0.63B2O3–0.37Li2O–0.75×10−3 Fe2O3 in mole %) were annealed at increasing temperatures Ta, starting at the glass transition temperature. A new composite resonance at gef≈2.0 arises in the spectra measured at room temperature (300 K). The narrow component of this resonance is predominant in glasses annealed at lower Ta while the broad component increases in intensity as Ta increases. This resonance is ascribed to an assembly of superparamagnetic nanoparticles of a crystalline iron-containing compound. Numerical simulations assuming a lognormal particle volume distribution show that the mean particle diameter increases from 5.3 to 8.5 nm as Ta increases from 748 to 823 K. The integrated spectra intensity shows that the total number of spins in the nanoparticles increases rapidly with Ta. At lower anneal temperatures Ta, a striking increase occurs in t...

86 citations


Journal ArticleDOI
Abstract: Left-handed behavior of strontium-doped lanthanum manganite was revealed in the millimeter waveband. The bulk specimen of La 1 − x Sr x MnO 3 , was used as a boundary medium for one-dimensional photonic crystal. In the absence of magnetic field known Tamm peak appears in the forbidden zone of photonic crystal indicating that manganite is a single negative medium (negative permittivity). In the presence of external magnetic field somewhat above frequency of ferromagnetic resonance the additional (field sensitive) transparency peak appears in photonic crystal forbidden zone, indicating that manganite becomes double negative medium (negative permittivity and permeability). Model theoretical calculations corroborate the experimental findings.

31 citations


Journal ArticleDOI
Abstract: Review discusses some special questions of physics of composite media (metamaterials), which are formed by elements made from natural materials of two kinds. The first ones are “carriers of permittivity” and are presented by plasma-like media and semiconductors. The second ones are “carriers of permeability”—they are presented by ferromagnets. Among such ferromagnets are ferrodielectrics (ferrites) and manganite-perovskite compounds. In the first chapter of the review some principal aspects of the electrodynamics of periodical structures—magnetophotonic crystals are considered. The questions of zone structure and possible violations of periodicity (Tamm states, defect mode) as well as the influence of external magnetic field on the spectral characteristics of magnetophotonic crystals are considered. The second chapter of the review is devoted to the electrodynamics of left-handed media (left-handed metamaterials). Different versions of composite left-handed media are considered. Particular attention is paid to features of electrodynamics of artificially synthesized left-handed media, the doped lanthanum manganites-perovskites, which in a certain concentrations of doping element and temperature range can serve as an example of natural left-handed media. The Appendix describes the details of experimental techniques radiophysical research. Note that the research and design of the metamaterials listed above in a range of low temperatures are particularly important. This is due to the fact that at low temperatures a main disadvantage of artificial materials mentioned above (quite large losses) becomes less noticeable. At the same time the main their advantage (namely the possibility to control their frequency dispersion) remains. Thus it seems that the most prospective areas of application and further study of the magnetic metamaterials lie at low temperatures.

27 citations


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