Conjectured orbital ordering behavior of Nd{sub 0.5}Sr{sub 0.5}MnO{sub 3} under high pressures

Journal Article · Fri Apr 15 04:00:00 EDT 2005 · Journal of Applied Physics

DOI:https://doi.org/10.1063/1.1866481· OSTI ID:20668317

Yu, R C; Tang, J; Yao, L D; Matsushita, A; Yu, Y; Li, F Y; Jin, C Q ^[1]

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1. Chinese Academy of Sciences, Key Laboratory of Extreme Conditions of Physics, Institute of Physics, P.O. Box 603, Beijing 100080 (China)

We have synthesized Nd{sub 0.5}Sr{sub 0.5}MnO{sub 3} polycrystalline bulk samples by solid state reaction, which show ferromagnetic (FM), A-type antiferromagnetic (AF) and charge ordering charge exchange (CE)-type AF transitions on cooling from room temperature to 78 K. We consider that the abundant magnetic structures are caused by phase segregation. We have investigated and conjectured the orbital ordering behavior under hydrostatic pressures up to 7.5 GPa and found that low pressure favors the A-type AF phase with d(x{sup 2}-y{sup 2}) orbital ordering and the CE-type AF phase with d(3x{sup 2}-r{sup 2})/d(3y{sup 2}-r{sup 2}) orbital ordering, while suppressing the FM phase with disordered orbital ordering; however, high pressure favors the A-type phase and suppresses the CE-type AF phase. Transport property enhancement and large resistance changes under high pressures are observed.

• OSTI ID: 20668317
• Journal Information: Journal of Applied Physics, Journal Name: Journal of Applied Physics Journal Issue: 8 Vol. 97; ISSN JAPIAU; ISSN 0021-8979
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ANTIFERROMAGNETIC MATERIALS
ANTIFERROMAGNETISM
CHARGE EXCHANGE
COOLING
FERROMAGNETIC MATERIALS
MAGNETORESISTANCE
MANGANESE OXIDES
NEODYMIUM COMPOUNDS
POLYCRYSTALS
PRESSURE DEPENDENCE
PRESSURE RANGE GIGA PA
SEGREGATION
SINTERING
STRONTIUM COMPOUNDS
TEMPERATURE DEPENDENCE
TEMPERATURE RANGE 0065-0273 K
TEMPERATURE RANGE 0273-0400 K