Pressure-induced phase segregation in single-crystal La{sub 2-2x}Sr{sub 1+2x}Mn{sub 2}O{sub 7} (x=0.32)

Journal Article · Sat Apr 01 00:00:00 EST 2000 · Physical Review. B, Condensed Matter and Materials Physics

DOI:https://doi.org/10.1103/PhysRevB.61.R9217· OSTI ID:20215842

Zhou, J -S ^[1]; Goodenough, J B ^[1]; Mitchell, J F ^[2]

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1. Texas Materials Institute, ETC 9.124, University of Texas at Austin, Austin, Texas 78712 (United States)
2. Materials Science Division, Argonne National Laboratory, Argonne, Illinois 60439 (United States)

The temperature dependence of resistivity {rho}(T) and of the thermoelectric power {alpha}(T) of a single crystal of the ferromagnetic Ruddlesden-Popper compound La{sub 2-2x}Sr{sub 1+2x}Mn{sub 2}O{sub 7} (x=0.32) have been measured under different hydrostatic pressures. Pressure induces segregation into antiferromagnetic electron-rich and ferromagnetic electron-poor Mn{sub 2}O{sub 7} layers. With increasing pressure, the ferromagnetic majority phase exhibits contraction of the apical (Mn-O) bond and spin reorientation from the c axis to the basal plane at a critical pressure P{sub c}(6{<=}P{sub c}{<=}7 kbar). The phase segregation appears to reflect a first-order inversion of the exchange coupling between ferromagnetic Mn{sub 2}O{sub 7} layers. (c) 2000 The American Physical Society.

• OSTI ID: 20215842
• Journal Information: Physical Review. B, Condensed Matter and Materials Physics, Journal Name: Physical Review. B, Condensed Matter and Materials Physics Journal Issue: 14 Vol. 61; ISSN 1098-0121
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ANTIFERROMAGNETIC MATERIALS
ELECTRIC CONDUCTIVITY
EXCHANGE INTERACTIONS
EXPERIMENTAL DATA
LANTHANUM OXIDES
MAGNETIC PROPERTIES
MANGANESE OXIDES
PHASE STUDIES
PHASE TRANSFORMATIONS
PRESSURE DEPENDENCE
SEGREGATION
SPIN ORIENTATION
STRONTIUM OXIDES
TEMPERATURE DEPENDENCE
THEORETICAL DATA
THERMOELECTRICITY