Issue |
EPL
Volume 84, Number 4, November 2008
|
|
---|---|---|
Article Number | 47009 | |
Number of page(s) | 6 | |
Section | Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties | |
DOI | https://doi.org/10.1209/0295-5075/84/47009 | |
Published online | 21 November 2008 |
Correlation between phase competition and the nucleation of a Griffiths-like phase in (La
Pry)0.7Ca0.3Mn16/18O3
Department of Physics and Astronomy, University of Manitoba - Winnipeg, Manitoba, R3T 2N2 Canada
Corresponding author: jiang@physics.umanitoba.ca
Received:
24
July
2008
Accepted:
20
October
2008
Detailed analyses of the temperature-dependent zero-field ac susceptibility
of prototypical phase-separated (LaPry)0.7Ca0.3Mn16/18O3 , 0
y
1, reveal
features consistent with the presence of a Griffiths-like phase (GP), viz, an
inverse susceptibility
characterized by
with
as y decreases towards
0.85.
Beyond
= 0.85, the GP is suppressed. These data, combined with
previous neutron diffraction measurements, enable a phase diagram summarizing the evolution of the GP with composition to be constructed for
this system; this phase diagram demonstrates the novel result that the
disorder relevant for the establishment of such a phase in this system is
linked closely to the relative volume fractions of the phase-separated
antiferromagnetic and ferromagnetic components, even when the recently
estimated double-exchange
linked percolation threshold is exceeded. The
influence of electron-phonon coupling can also be seen through oxygen isotope effects.
PACS: 75.40.Cx – Static properties (order parameter, static susceptibility, heat capacities, critical exponents, etc.) / 75.47.Lx – Manganites / 75.47.Gk – Colossal magnetoresistance
© EPLA, 2008
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