Transport and Magnetic Properties of R_1-xA_xCoO₃(R = La, Pr and Nd; A = Ba, Sr and Ca)

Abstract

Transport and magnetic measurements have been carried out on perovskite Co-oxides R 1-x A x CoO 3 (R=La, Pr, and Nd; A=Ba, Sr and Ca; 0≤x≤0.5: All sets of the R and A species except No indication of this kind of transition has been observed in other species of R.

Role ofA-site cations in the metal-insulator transition inPr0.5Ca0.5CoOBarón-González1, Frontera2, García-Muñoz3 et al. 2010Phys. Rev. B395600View full textAdd to dashboardCite

“…[14][15][16][17][18][19] Besides, our measurements show that above 100 K, an applied field of 9 T scarcely affects the resistivity and, in fact, slightly enlarges with the field. This demonstrates that the mobility of itinerant electrons does not depend on the magnetic arrangement of the core spins ͑t 2g 5 ͒.…”

“…For the nearest lanthanides to Pr, R =La ͑bigger͒ or Nd ͑smaller͒, this transition does not take place. 15 Taking this fact into account, the sudden shortening of the A-O bond distance coinciding with the enhancement of the resistivity must be interpreted in terms of the occurrence of electronic changes in Pr ions. This shortening could be due to a hybridization of Pr 4f and O 2p orbitals as reported for PrBa 2 Cu 3 O 7−␦ .…”

“…[14][15][16][17][18][19][20][21][22] This compound presents, on cooling a sudden increase in the resistivity, usually described as a metal to insulator transition ͑MIT͒. It is accompanied by an anisotropic cell anomaly and a sudden large cell volume contraction.…”

Influence of Pressure on Magnetic Properties of La1-xSrxCoO3-δ(x=0.5, 0.67, 1)

“…It was shown that pressure might have an influence on a spin-state transition at 100 K in LaCoO 3 [5]. Masuda et al have found resistivity anomaly at low temperature under pressure in Pr 0.7 Ca 0.3 CoO 3 which indicated the existence of the phase transition [6]. In Ref.…”

Magnetic Structures and Spin States of NdBaCo2O5.5

“…[5][6][7][8] For the combinations of large Ba 2+ ions and relatively small R 3+ ions, the system forms several kinds of the oxygen-deficient perovskite structure, in which the oxygen vacancies are ordered, [9][10][11][12][13][14][15][16][17] and a various physical behaviors are expected. However, only the restricted information is available on both the structural properties and the electronic properties.…”