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Mixed Phase Behavior in Hole-Doped Perovskite Materials

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Abstract:

MZFC, MFC magnetizations, χac susceptibility and resistance measurements have been carried out for various polycrystalline compounds of (AA’)(BB’)O3 perovskites with A = La, (Nd,Y); B = Mn,Co; A’ = Sr,Ca and B’= Fe, Ti. Analyses have been done to elucidate the metallic ferromagnetism (FM) established by Double Exchange interaction between B+3 ion and the B+4 ion that is induced by the substitution of A’ for A. It is shown that there is no ‘pure’ FM ordering existing in the compounds, in other words the materials consist of a FM and a non-FM phase. In case when the latter is an AFM phase, the coexistence and competition of the two phases result in spin-glass like appearances. Such phenomena have been observed in several compounds of both single- and/or mixed-element at B site. The studies on substitution of Mn for Co in La0.7Sr0.3Co1- yMnyO3 show no DE interaction between the two magnetic ions, which results in not only SG behavior at y = 0.1 concentration but a clear evidence on a phase separation in the high y region. An analysis of M(H,T) curves for this region suggests a structural scenario that the FM phase forms as islets (of volume fraction as small as 2.7 – 8.6%) embedded in isolating AFM matrix. For the case while B’= Ti the inhomogeneity evidence appears as an enhancement of the Low Field MagnetoResistance, which is commonly understood as an intergranular effect.

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Periodical:

Solid State Phenomena (Volume 111)

Pages:

7-12

DOI:

https://doi.org/10.4028/www.scientific.net/SSP.111.7

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Online since:

April 2006

Authors:

X.P. Nguyen, V.B. Le

Keywords:

Magnetic and Transport Properties, Perovskite Materials, Phase Separation, Spin Glass

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© 2006 Trans Tech Publications Ltd. All Rights Reserved

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References

[1] C. Zener, Phys. Rev. 82 (1951) 403.

Google Scholar

[2] E. Dagotto Nanoscale Phase Separation and Colossal Magnetoresistance, May 27, 2002, Springer - Verlag; see also E. Dagotto, Phys. Report 344(2001)1.

DOI: 10.1007/978-3-662-05244-0

Google Scholar

[3] S. Yunoki, et al., Phys. Rev. Lett. 80, 845 (1998); see also S. Yunoki, A. Moreo, E. Dagotto, ibid. 81, 5612 (1998); S. Yunoki and A. Moreo, ibid., p.6403.

DOI: 10.1103/physrevlett.80.845

Google Scholar

[4] S-Q. Shen and Z. D. Wang, Phys. Rev. B 58, R8877 (1998).

Google Scholar

[5] E. L. Nagaev, Phys. Rev. B 58, 2415 (1998).

Google Scholar

[6] Uehara M., Nature 399, 560(1999), Fath M., Science 285, 1540(1999).

Google Scholar

[7] A. Sundaresan, A. Maigan, and B. Raveau, Phys. Rev. B 56 (1997) 5092.

Google Scholar

[8] D.N.H. Nam, N.X. Phuc, N.N. Toan, N.V. Khiem, R. Mathieu, and Per. Nordblad, Advances in Natural Sciences, 2 (2001)27.

Google Scholar

[9] D.N.H. Nam, K. Jonason, P. Nordblad, N.V. Khiem, and N.X. Phuc, Phys. Rev. B 59 (1999) p.4189.

Google Scholar

[10] D.N.H. Nam, R. Mathieu, P. Nordblad, N.V. Khiem, and N.X. Phuc, Phys. Rev. B 62 (2000) pp.1027-1032.

Google Scholar

[11] D.N.H. Nam, R. Mathieu, P. Nordblad, N.V. Khiem, and N.X. Phuc, Phys. Rev. B 62, (2000) p.8989.

Google Scholar

[12] R. Mathieu, P. Nordblad, D.N.H. Nam, N.X. Phuc and N.V. Khiem, Phys. Rev. B 63 (2000) p.174405.

Google Scholar

[13] N.V. Khiem, D.N.H. Nam, N.X. Phuc, and N.N. Toan, Proceedings of 3rd Vietnamese-German Seminar on Physics and Engineering, HCM City, Apr. 2000, pp.155-158.

Google Scholar

[14] N.V. Khiem, D.N.H. Nam, L.V. Bau, and N.X. Phuc, Proceedings of 5th Vietnamese-German Seminar on Physics and Engineering, Hue, . 2002, pp.161-164.

Google Scholar

[15] N.X. Phuc, L.V. Bau, N.V. Khiem, L.H. Son, and D.N.H. Nam, Physica B 327 (2003) 177.

Google Scholar

[16] N.V. Khiem, L.V. Bau, D.N.H. Nam, N.M. An, L.V. Hong and N.X. Phuc, J. Mag. Mag. Mat. (2003).

Google Scholar

[17] T. L. Phan, S.C. Yu, N.V. Khiem, M.H. Phan, J.R. Rhee, N.X. Phuc J. Appl. Phys. 97 (2005) proof copy 684510JAP.

Google Scholar

[18] H.Y. Hwang, S-W. Cheong, N.P. Ong, and B. Batlogg, Phys. Rev. Lett. 77 (1996) (2041).

Google Scholar

[19] L.V. Bau, N.V. Khiem, L.V. Hong, N.X. Phuc, P. Nordblad, and D.N.H. Nam, J. Mag. Mag. Mat. 272 - 276 (2004)e975-e979, ibid, Comm in Physics (2003).

DOI: 10.1016/j.jmmm.2003.12.106

Google Scholar

[20] L.V. Bau et al, presented at The 9 th APPC conference, Hanoi, October 2004, accepted to be published in the conference Proceedings.

Google Scholar