Effect of Cr substitution on the crystal and magnetic structure of (Pr{sub 0.55}Ca{sub 0.45})MnO{sub 3}: A neutron powder diffraction investigation

Journal Article · Wed Feb 01 00:00:00 EST 2006 · Physical Review. B, Condensed Matter and Materials Physics

DOI:https://doi.org/10.1103/PHYSREVB.73.0· OSTI ID:20787899

Martinelli, A; Tropeano, M ^[1]; Ferretti, M ^[1]; Castellano, C ^[2]; Mondelli, C ^[3]; Cimberle, M R ^[4]; Ritter, C ^[5]

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1. INFM-LAMIA-CNR, C.so Perrone 24, 16152 Genova (Italy)
2. Dipartimento di Fisica, Universita di Roma 'La Sapienza', P. le A. Moro 2, 00185 Rome (Italy)
3. CNR-INFM and CRS Soft, Institut Laue-Langevin, 6 rue Jules Horowitz, 38042 Genoble Cedex 9 (France)
4. CNR-IMEM sezione di Genova c/o Dipartimento di Fisica, Universita di Genova, Via Dodecaneso 33, 16146, Genova (Italy)
5. Institute Laue-Langevin, 6 rue Jules Horowitz, 38042 Grenoble Cedex 9 (France)

The crystal and magnetic structures of (Pr{sub 0.55}Ca{sub 0.45})(Mn{sub 1-y}Cr{sub y})O{sub 3} (y=0.00,0.03,0.06) have been investigated between 5 and 300 K by neutron powder diffraction and dc magnetic measurements. An orthorhombic-to-monoclinic phase transition occurs on cooling in (Pr{sub 0.55}Ca{sub 0.45})MnO{sub 3} at T{approx_equal}239 K; at lower temperature charge ordering in the Mn sublattice, coupled with orbital ordering, induces an AFM spin ordering within the monoclinic phase. Cr substitution at the Mn site hinders the structural phase transition, although for the y=0.03 sample small amounts of the monoclinic phase coexist at low temperature with the main phase characterized by an orthorhombic structure. Cr substitution prevents charge ordering, favoring double exchange and hence FM spin ordering within the Mn sublattice.

• OSTI ID: 20787899
• Journal Information: Physical Review. B, Condensed Matter and Materials Physics, Vol. 73, Issue 6; Other Information: DOI: 10.1103/PhysRevB.73.064423; (c) 2006 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 1098-0121
• Country of Publication: United States
• Language: English

Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ANTIFERROMAGNETIC MATERIALS
ATOMIC FORCE MICROSCOPY
CALCIUM COMPOUNDS
CHROMIUM
CONCENTRATION RATIO
CRYSTALS
ELECTRON COOLING
EXCHANGE INTERACTIONS
FERROMAGNETIC MATERIALS
MONOCLINIC LATTICES
NEUTRON DIFFRACTION
ORTHORHOMBIC LATTICES
PHASE TRANSFORMATIONS
PRASEODYMIUM COMPOUNDS
SOLIDS
SPIN
TEMPERATURE DEPENDENCE