期刊
JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN
卷 69, 期 6, 页码 1606-1609出版社
PHYSICAL SOC JAPAN
DOI: 10.1143/JPSJ.69.1606
关键词
double-layered manganite; colossal magnetoresistance (CMR); powder neutron diffraction; magnetic phase diagram; Jahn-Teller distortion; e(g) orbital state; low dimensionality
The magnetic phase diagram of La2-2xSr1+2xMn2O7 (0.30 less than or equal to x less than or equal to 0.50) was reexamined from the point of view of the crystal structure, particularly the Jahn-Teller (JT) distortion Delta(JT) of Mn-O-6 octahedra, i.e., the ratio of the averaged apical Mn-O bond length. to the equatorial Mn-O bond length. We have found that Delta(JT) decreases with increasing hole concentration x. while the canting angle between neighboring planes continuously increases from 0 degrees (planar ferromagnet: 0.32 less than or equal to x less than or equal to 0.38) to 180 degrees (A-type antiferromagnet (AFM): x = 0.48). The dominance of the A-type AFM structure with the decrease of Delta(JT) call be ascribed to the change in the epsilon(g) orbital State from d(3z2-x2) to d(x2-y2).
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