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@ARTICLE{Mishra:837905,
author = {Mishra, S. K. and Mittal, R. and Chaplot, S. L. and
Ovsyannikov, S. V. and Trots, D. M. and Dubrovinsky, L. and
Su, Y. and Matsuishi, S. and Hosono, H. and Garbarino, G.
and Brückel, Thomas},
title = {{P}ressure-driven {P}hase {T}ransition in {C}a{F}e{A}s{F}
at 40 and 300 {K}},
journal = {Journal of physics / Conference Series},
volume = {377},
issn = {1742-6596},
address = {Bristol},
publisher = {IOP Publ.},
reportid = {FZJ-2017-06675},
pages = {012034 -},
year = {2012},
abstract = {We carried out systematic investigation of high pressure
crystal structure and structural phase transition upto 46
GPa at 40 K and 25 GPa at 300 K in CaFeAsF using powder
synchrotron x-ray diffraction experiments. Rietveld analysis
of the diffraction data at 40 K reveals a structural phase
transition from an orthorhombic to a monoclinic phase at Pc
= 13.7 GPa, while increasing pressure. The transition to a
lower symmetry phase (orthorhombic to monoclinic) in this
1111 compound under pressure is in contrast with the
transition to a high symmetry phase (orthorhombic to
tetragonal) as observed in the '122' type compounds. On
heating from 40 K at high pressure, CaFeAsF undergoes a
monoclinic to tetragonal phase transition around 25 GPa and
200 K. Further, it does not show any post-tetragonal phase
transition, as observed in '122' compounds (CaFe2As2,
BaFe2As2), and remains in the tetragonal phase upto 25 GPa
at 300 K. The dPc/dT slope is found to be positive for
CaFeAsF and CaFe2As2, unlike a negative gradient was found
in case of BaFe2As2.},
cin = {JCNS-2 / PGI-4 / JARA-FIT / JCNS-FRM-II},
ddc = {530},
cid = {I:(DE-Juel1)JCNS-2-20110106 / I:(DE-Juel1)PGI-4-20110106 /
$I:(DE-82)080009_20140620$ /
I:(DE-Juel1)JCNS-FRM-II-20110218},
pnm = {144 - Controlling Collective States (POF3-144) / 524 -
Controlling Collective States (POF3-524) / 6212 - Quantum
Condensed Matter: Magnetism, Superconductivity (POF3-621) /
6213 - Materials and Processes for Energy and Transport
Technologies (POF3-621) / 6G4 - Jülich Centre for Neutron
Research (JCNS) (POF3-623)},
pid = {G:(DE-HGF)POF3-144 / G:(DE-HGF)POF3-524 /
G:(DE-HGF)POF3-6212 / G:(DE-HGF)POF3-6213 /
G:(DE-HGF)POF3-6G4},
experiment = {EXP:(DE-MLZ)NOSPEC-20140101},
typ = {PUB:(DE-HGF)16},
UT = {WOS:000307728500034},
doi = {10.1088/1742-6596/377/1/012034},
url = {https://juser.fz-juelich.de/record/837905},
}