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http://dx.doi.org/10.4283/JMAG.2007.12.3.103

Possible Role of Disorder on Magnetostructural Transition in La1-xBaxMnO3  

Kim, N.G. (Department of Physics, Inha University)
Jung, J.H. (Department of Physics, Inha University)
Publication Information
Journal of Magnetics / v.12, no.3, 2007 , pp. 103-107 More about this Journal
Abstract
Magnetic field induced structural transition has been systematically investigated for $La_{1-x}Ba_xMnO_3$ with the fine control of carrier doping $(0.15{\leq}x{\leq}0.20)$. Application of a magnetic field results in the suppression of the rhombohedral-orthorhombic transition temperature $(T_s)$ and the increase of insulator-metal transition temperature $(T_{MI})$. Near x = 0.17, where $T_S$ is similar to $T_{MI}$ at zero magnetic field, we found that the $T_S$ smoothly decreased with magnetic field even though it intersected the $T_{MI}$ near 3 T. Also, the magnetostructural phase diagram obtained from the temperature sweep and from the magnetic field sweep is not significantly modified. By comparing the magnetostructural transition in $La_{1-x}Sr_xMnO_3$, we have suggested that the large disorder originated from ionic size differences between La and Ba may weaken the sensitivity of the kinetic energy of $e_g$ electrons on the degree of lattice distortion in $La_{1-x}Ba_xMnO_3$.
Keywords
magnetostructural transition; La1-xBaxMnO3; disorder;
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  • Reference
1 For example, Colossal Magnetoresistive Oxides, edited by Y. Tokura (Gordon and Breach Science Publishers, London, 2000)
2 M. B. Salamon and M. Jaime, Rev. Mod. Phys. 73, 583 (2001) and references therein
3 Y. Tokura and N. Nagaosa, Science 288, 462 (2000)
4 A. J. Millis, Nature (London) 392, 147 (1998)
5 A. Moreo, S. Yunoki, and E. Dagotto, Science 283, 2034 (1999)
6 A. Asamitsu, Y. Moritomo, Y. Tomioka, T. Arima, and Y. Tokura, Nature (London) 373, 407 (1995)
7 V. E. Arkhipov, N. G. Bebenin, V. P. Dyakina, V. S. Gaviko, A. V. Korolev, V. V. Mashkaustan, E. A. Neifeld, R. I. Zainullina, Ya. M. Mukovskii, and D. A. Shulyatev, Phys. Rev. B 61, 11 229 (2000)
8 V. Laukhin, B. Martinez, J. Fontcuberta, and Y. M. Mukovskii, Phys. Rev. B 63, 214 417 (2001)   DOI   ScienceOn
9 Y. Tomioka, A. Asamitsu, and Y. Tokura, Phys. Rev. B 63, 024 421(2000)
10 A. Urushibara, Y. Moritomo, T. Arima, A. Asamitsu, G. Kido, and Y. Tokura, Phys. Rev. B 51, 14 103 (1995)   DOI   ScienceOn
11 P. W. Anderson and H. Hasegawa, Phys. Rev. 100, 675 (1955)   DOI
12 P. Mandal and B. Ghosh, Phys. Rev. B 68, 014422 (2003)
13 P.-G. de Gennes, Phys. Rev. 118, 141 (1960)
14 Y. Moritomo, A. Asamitsu, and Y. Tokura, Phys. Rev. B 56, 12190 (1997)   DOI
15 L. M. Rodriguez-Martinez and J. P. Attfield, Phys. Rev. B 54, R15 622 (1996); ibid. 58, 2426 (1998)
16 The disorder can be quantitatively obtained by the variance, i.e., ${\sigma}^2={\Sigma}y_iR_{i}^{2}}-{^2}$, Where $y_i$, $R_i$, and $R_A$ represent the fractional occupancies, ionic radii $(La^{3+}=1.22 {\AA}, Sr^{2+}=1.31 {\AA}, Ba^{2+}=1.47 {\AA})$, and mean radius of R and A ions, respectively
17 A. Asamitsu, Y. Moritomo, R. Kumai, Y. Tomioka, and Y. Tokura, Phys. Rev. B 54, 1716 (1996)