de Lima, B. S., da Luz, M. S., Oliveira, F. S., Alves, L. M. S., dos Santos, C. A. M., Jomard, F., Sidis, Y., Bourges, P., Harms, S., Grams, C. P., Hemberger, J., Lin, X., Fauque, B. and Behnia, K. (2015). Interplay between antiferrodistortive, ferroelectric, and superconducting instabilities in Sr1-x Ca-x TiO3-delta. Phys. Rev. B, 91 (4). COLLEGE PK: AMER PHYSICAL SOC. ISSN 2469-9969

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Abstract

SrTiO3 undergoes a cubic-to-tetragonal phase transition at 105 K. This antiferrodistortive transition is believed to be in competition with incipient ferroelectricity. Substituting strontium by isovalent calcium induces a ferroelectric order. Introducing mobile electrons to the system by chemical nonisovalent doping, on the other hand, leads to the emergence of a dilute metal with a superconducting ground state. The link between superconductivity and the other two instabilities is a question gathering momentum in the context of a popular paradigm linking unconventional superconductors and quantum critical points. We present a set of specific-heat, neutron-scattering, dielectric-permittivity, and polarization measurements on Sr1-x Ca-x TiO3 (0 < x < 0.009) and a study of low-temperature electric conductivity in Sr-0.9978 Ca-0.0022 TiO3-delta. Calcium substitution was found to enhance the transition temperature for both antiferrodistortive and ferroelectric transitions. Moreover, we find that Sr-0.9978 Ca-0.0022 TiO3-delta has a superconducting ground state. The critical temperature in this rare case of a superconductor with a ferroelectric parent is slightly lower than in SrTiO3-delta of comparable carrier concentration. A three-dimensional phase diagram for Sr1-x Ca-x TiO3-delta tracking the three transition temperatures as a function of x and delta results from this study, in which ferroelectric and superconducting ground states are not immediate neighbors.

Item Type: Journal Article
Creators:
CreatorsEmailORCIDORCID Put Code
de Lima, B. S.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
da Luz, M. S.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Oliveira, F. S.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Alves, L. M. S.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
dos Santos, C. A. M.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Jomard, F.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Sidis, Y.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Bourges, P.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Harms, S.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Grams, C. P.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Hemberger, J.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Lin, X.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Fauque, B.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Behnia, K.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
URN: urn:nbn:de:hbz:38-414768
DOI: 10.1103/PhysRevB.91.045108
Journal or Publication Title: Phys. Rev. B
Volume: 91
Number: 4
Date: 2015
Publisher: AMER PHYSICAL SOC
Place of Publication: COLLEGE PK
ISSN: 2469-9969
Language: English
Faculty: Unspecified
Divisions: Unspecified
Subjects: no entry
Uncontrolled Keywords:
KeywordsLanguage
PHASE-TRANSITION; TEMPERATURE; SR1-XCAXTIO3; DEPENDENCE; SRTIO3Multiple languages
Materials Science, Multidisciplinary; Physics, Applied; Physics, Condensed MatterMultiple languages
URI: http://kups.ub.uni-koeln.de/id/eprint/41476

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