Engelmayer, Johannes, Lin, Xiao ORCID: 0000-0002-1773-1761, Koc, Fulya, Grams, Christoph P., Hemberger, Joachim, Behnia, Kamran and Lorenz, Thomas
ORCID: 0000-0003-4832-5157
(2019).
Ferroelectric order versus metallicity in Sr1-xCaxTiO3-delta (x=0.009).
Phys. Rev. B, 100 (19).
COLLEGE PK:
AMER PHYSICAL SOC.
ISSN 2469-9969
Abstract
We report on a thermal-expansion study of the ferroelectric phase transition in insulating Sr1-xCaxTiO3 (x = 0.009) and its evolution upon increasing charge-carrier concentration up to n similar or equal to 60 x 10(19) cm(-3). Although electric polarization is screened by mobile charge carriers, we find clear signatures of the ferroelectric phase transition in the thermal-expansion coefficient alpha of the weakly doped metallic samples. Upon increasing n, the transition temperature T-C(n) and the magnitude of the anomalies in alpha rapidly decrease up to a threshold carrier density n* above which broadened anomalies remain present. There is no indication for a sign change of alpha as is expected for a pressure-dependent quantum phase transition with n as the control parameter. Thus, the ferroelectric like transition is either continuously fading away or it transforms to another low-temperature phase above n*, but this change hardly affects the temperature-dependent alpha(T) data.
Item Type: | Journal Article | ||||||||||||||||||||||||||||||||
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URN: | urn:nbn:de:hbz:38-127721 | ||||||||||||||||||||||||||||||||
DOI: | 10.1103/PhysRevB.100.195121 | ||||||||||||||||||||||||||||||||
Journal or Publication Title: | Phys. Rev. B | ||||||||||||||||||||||||||||||||
Volume: | 100 | ||||||||||||||||||||||||||||||||
Number: | 19 | ||||||||||||||||||||||||||||||||
Date: | 2019 | ||||||||||||||||||||||||||||||||
Publisher: | AMER PHYSICAL SOC | ||||||||||||||||||||||||||||||||
Place of Publication: | COLLEGE PK | ||||||||||||||||||||||||||||||||
ISSN: | 2469-9969 | ||||||||||||||||||||||||||||||||
Language: | English | ||||||||||||||||||||||||||||||||
Faculty: | Faculty of Mathematics and Natural Sciences | ||||||||||||||||||||||||||||||||
Divisions: | Faculty of Mathematics and Natural Sciences > Department of Physics > Institute of Physics II | ||||||||||||||||||||||||||||||||
Subjects: | no entry | ||||||||||||||||||||||||||||||||
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Refereed: | Yes | ||||||||||||||||||||||||||||||||
URI: | http://kups.ub.uni-koeln.de/id/eprint/12772 |
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