Wang CW, Wu CM, Li CY, Karna SK, Hsu CK, Li CHC, Li WH, Yu CC, Wu CP, Chou H, Lynn JW. Short range magnetic correlations induced by La substitution in Ho(1-x)La(x)Mn(2)O(5).
JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2010;
22:246002. [PMID:
21393793 DOI:
10.1088/0953-8984/22/24/246002]
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Abstract
Magnetic susceptibility, x-ray diffraction, neutron diffraction and Raman scattering measurements are employed to study the effects of La substitution on the magnetic properties of multiferroic HoMn(2)O(5). 9% and 18% La-substituted compounds crystallize into the same orthorhombic Pbam symmetry as the parent compound. The magnetic responses to an ac driving magnetic field between 40 and 140 K are greatly enhanced by 18% La substitution. The neutron magnetic diffraction patterns reveal the development of short range magnetic correlations below 140 K. In addition, two Raman peaks and a series of new x-ray diffraction peaks suddenly develop below this temperature. Incommensurate long range antiferromagnetic order appears below 38 K. Magnetic frustration could be the main mechanism governing the present observations.
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