La_<0.7>Ca_<0.3-x>Sr_xMnO_3 Manganites : Effect of Structure on the Magnetic and Transport Properties

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概要

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• The effect of lattice structure on the magnetic and transport properties of La_<0.7>Ca_<0.3-x>Sr_xMnO_3 (x=0; 0.03; 0.06; ...; 0.3) lanthanum manganites have been studied. Curie temperature pressure coefficient, dT_c/dP, showed the dependence on x value. Temperature T_c increased almost linearly under applied pressure as dT_c/dP ≈ 14 K/GPa and as dT_c/dP ≈ 7.5 K/GPa in the orthorhombic (Pbnm) and rhombohedral (R3c) phases, respectively. The value of dT_c/dP(≈ 3.5 K/GPa) showed a minimum and a temperature of the resistance maximum, T_p(x), showed a change of slope at x=0.15, corresponding to the concentration structural phase transition. Differences between the values of dT_c/dP and slopes of T_p versus x in Pbnm and R3c phases are explained by the different effect of external pressure on the Mn-O bond length and Mn-O-Mn bond angle, and by the different internal pressure effect in those phases, respectively.

• 社団法人日本物理学会の論文
• 2002-03-15

著者

• YU Seong-Cho

  Department of Physics, Chung-Buk National University

• Yu Seong-cho

  Department Of Physics Chungbuk National University

• Yu Seong-cho

  Department Of Physics Chung-buk National University:department Of Physics University Of Maryland

• Ulyanov A.

  Department Of Physics Chungbuk National University:donetsk Physico-technicat Institute Of National A

• MAKSIMOV I.

  Donetsk Physico-Technical Institute of National Academy of Sciences

• NYEANCHI E.

  Department of Experimental Physics, University of Umea

• MEDVEDEV Yu.

  Donetsk Physico-Technical Institute of National Academy of Sciences

• STAROSTYUK N.

  Donetsk Physico-Technical Institute of National Academy of Sciences

• SUNDQVIST B.

  Department of Experimental Physics, University of Umea

• Nyeanchi E.

  Department Of Experimental Physics University Of Umea

• Sundqvist B.

  Department Of Experimental Physics University Of Umea

• Ulyanov A

  Department Of Physics Chungbuk National University:donetsk Physico-technical Institute Of National A

• Ulyanov A.

  Department Of Physics Chungbuk National University:donetsk Physico-technical Institute Of National A

• Maksimov I.

  Donetsk Physico-technical Institute Of National Academy Of Sciences:department Of Experimental Physi

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