skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Pressure-induced changes in transport properties of layered La{sub 1.2}Ca{sub 1.8}Mn{sub 2}O{sub 7}

Abstract

The transport properties of a single crystal of La{sub 1.2}Ca{sub 1.8}Mn{sub 2}O{sub 7} with the layered Sr{sub 3}Ti{sub 2}O{sub 7}-type perovskite structure have been studied under hydrostatic pressures of up to {approximately}9 kbar. It is found that La{sub 1.2}Ca{sub 1.8}Mn{sub 2}O{sub 7} undergoes a first-order phase transition from a paramagnetic insulating to a low-temperature ferromagnetic metallic state which is accompanied by a large decrease in the electrical resistivity. At ambient pressure the magnetic phase transition takes place at T{sub c}=242 K and as the external pressure is applied the critical temperature increases linearly at a rate of 1.1 K/kbar. The present results reflect the competition between double and superexchange resulting from two-dimensional Mn-O-Mn networks and can be interpreted in terms of the exchange striction model. {copyright} {ital 1997} {ital The American Physical Society}

Authors:
; ; ;  [1]
  1. Department of Physics, University of Warwick, Coventry CV4 7AL (United Kingdom)
Publication Date:
OSTI Identifier:
553105
Resource Type:
Journal Article
Journal Name:
Physical Review, B: Condensed Matter
Additional Journal Information:
Journal Volume: 56; Journal Issue: 20; Other Information: PBD: Nov 1997
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; LANTHANUM OXIDES; MAGNETORESISTANCE; ELECTRIC CONDUCTIVITY; CALCIUM OXIDES; MANGANESE OXIDES; PRESSURE DEPENDENCE; VERY HIGH PRESSURE; ELECTRIC IMPEDANCE; EXCHANGE INTERACTIONS; PHASE TRANSFORMATIONS

Citation Formats

Kamenev, K V, Lees, M R, Balakrishnan, G, and Paul, D M. Pressure-induced changes in transport properties of layered La{sub 1.2}Ca{sub 1.8}Mn{sub 2}O{sub 7}. United States: N. p., 1997. Web. doi:10.1103/PhysRevB.56.R12688.
Kamenev, K V, Lees, M R, Balakrishnan, G, & Paul, D M. Pressure-induced changes in transport properties of layered La{sub 1.2}Ca{sub 1.8}Mn{sub 2}O{sub 7}. United States. https://doi.org/10.1103/PhysRevB.56.R12688
Kamenev, K V, Lees, M R, Balakrishnan, G, and Paul, D M. 1997. "Pressure-induced changes in transport properties of layered La{sub 1.2}Ca{sub 1.8}Mn{sub 2}O{sub 7}". United States. https://doi.org/10.1103/PhysRevB.56.R12688.
@article{osti_553105,
title = {Pressure-induced changes in transport properties of layered La{sub 1.2}Ca{sub 1.8}Mn{sub 2}O{sub 7}},
author = {Kamenev, K V and Lees, M R and Balakrishnan, G and Paul, D M},
abstractNote = {The transport properties of a single crystal of La{sub 1.2}Ca{sub 1.8}Mn{sub 2}O{sub 7} with the layered Sr{sub 3}Ti{sub 2}O{sub 7}-type perovskite structure have been studied under hydrostatic pressures of up to {approximately}9 kbar. It is found that La{sub 1.2}Ca{sub 1.8}Mn{sub 2}O{sub 7} undergoes a first-order phase transition from a paramagnetic insulating to a low-temperature ferromagnetic metallic state which is accompanied by a large decrease in the electrical resistivity. At ambient pressure the magnetic phase transition takes place at T{sub c}=242 K and as the external pressure is applied the critical temperature increases linearly at a rate of 1.1 K/kbar. The present results reflect the competition between double and superexchange resulting from two-dimensional Mn-O-Mn networks and can be interpreted in terms of the exchange striction model. {copyright} {ital 1997} {ital The American Physical Society}},
doi = {10.1103/PhysRevB.56.R12688},
url = {https://www.osti.gov/biblio/553105}, journal = {Physical Review, B: Condensed Matter},
number = 20,
volume = 56,
place = {United States},
year = {Sat Nov 01 00:00:00 EST 1997},
month = {Sat Nov 01 00:00:00 EST 1997}
}