Avalanches, irreversibility, and phase separation in Co-substituted Pr_0.50Ca_0.50Mn_1–xCo_xO₃

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C. Yaicle,¹ C. Frontera,² J. L. García-Muñoz,² C. Martin,¹ A. Maignan,¹ G. André,³ F. Bourée,³ C. Ritter,⁴ and I. Margiolaki⁵
¹Laboratoire CRISMAT, UMR 6508 CNRS/Ensicaen, 6 bd du Maréchal Juin, F-14050 Caen Cedex, France
²Institut de Ciència de Materials de Barcelona, CSIC, Campus Universitari de Bellaterra, E-08193 Bellaterra, Spain
³LLB, CEA-Saclay, F-91191 Gif-Sur-Yvette Cedex, France
⁴Institut Laue Langevin, Boîte Postale 156, F-38042 Grenoble Cedex 9, France
⁵European Synchrotron Radiation Facility, ESRF, Boîte Postale 220, F-38043 Grenoble, France

Received 5 May 2006; revised 17 July 2006; published 6 October 2006

Combiningmagnetization and magnetotransport measurements, synchrotron, and neutron powder diffraction data,we have deeply studied the structural and magnetic nature ofsegregated phases, and the occurrence of magnetization and resistivity avalanchesunder magnetic field in Pr_0.50Ca_0.50Mn_1–xCo_xO₃ (x=0.02 and 0.05). We reportthe segregation of two phases at low temperature which evolvewith Co content. For x=0.05 these phases (82 wt. % and 18 wt. %)present different distortion degrees, and different strain. The less distorted(and more strained) being ferromagnetically ordered and the more distortedbeing magnetically disordered. For x=0.02 both phases (58 wt. % and 42 wt. %)are highly and similarly distorted, and exhibit CE-type antiferromagnetic order.We find that spontaneous phase segregation occurs independently of theformation of ferromagnetic regions, and report the absence of pseudo-CEphase in these Co substituted manganites. In addition, low temperaturemagnetization vs field curves present a highly irreversible behavior (afterthe first magnetization curve): the occurrence of magnetization steps isa manifestation of the irreversible effect of magnetic field atlow temperature, but this irreversibility is independent of the occurrenceof steps. The evolution of internal strains is analyzed underCo substitution.

URL:	http://link.aps.org/doi/10.1103/PhysRevB.74.144406
DOI:	10.1103/PhysRevB.74.144406
PACS:	75.25.+z; 71.30.+h; 71.38.-k; 71.45.Lr 75.25.+z Spin arrangements in magnetically ordered materials including neutron and spin-polarized electron studies, synchrotron-source X-ray scattering, etc 71.30.+h Metal–insulator transitions and other electronic transitions 71.38.-k Polarons and electron–phonon interactions 71.45.Lr Charge-density-wave systems YEAR: 2006
KEYWORDS:	praseodymium compounds, calcium compounds, manganese compounds, ferromagnetic materials, antiferromagnetic materials, phase separation, segregation, magnetisation, magnetoresistance, neutron diffraction, magnetic transitions, magnetic structure, chemical exchanges

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