Structural and magnetic phase transitions in EuTi1-xNbxO3

Li, Ling; Morris, James R.; Koehler, Michael R.; Dun, Zhiling; Zhou, Haidong; Yan, Jiaqiang; Mandrus, David; Keppens, Veerle

doi:10.1103/PhysRevB.92.024109

Title: Structural and magnetic phase transitions in EuTi_1-xNb_xO₃

Journal Article · Thu Jul 30 00:00:00 EDT 2015 · Physical Review. B, Condensed Matter and Materials Physics

DOI:https://doi.org/10.1103/PhysRevB.92.024109· OSTI ID:1265813

Li, Ling ^[1]; Morris, James R. ^[2]; Koehler, Michael R. ^[1]; Dun, Zhiling ^[1]; Zhou, Haidong ^[1]; Yan, Jiaqiang ^[2]; Mandrus, David ^[2]; Keppens, Veerle ^[1]

Univ. of Tennessee, Knoxville, TN (United States)
Univ. of Tennessee, Knoxville, TN (United States); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

Here, we investigate the structural and magnetic phase transitions in EuTi_1-xNb_xO₃ (0≤x≤0.3) with synchrotron powder x-ray diffraction, resonant ultrasound spectroscopy, and magnetization measurements. Upon Nb doping, the Pm$$\bar{3}$$m ↔ I4/mcm structural transition shifts to higher temperatures and the room temperature lattice parameter increases while the magnitude of the octahedral tilting decreases. In addition, Nb substitution for Ti destabilizes the antiferromagnetic ground state of the parent compound and long-range ferromagnetic order is observed in the samples with x≥0.1. Moreover, the structural transition in pure and doped compounds is marked by a dramatic step-like softening of the elastic moduli near T_S, which resembles that of SrTiO₃ and can be adequately modeled using the Landau free energy model employing the same coupling between strain and octahedral tilting order parameter as previously used to model SrTiO₃.

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Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: AC05-00OR22725; AC02-06CH11357

OSTI ID:: 1265813

Alternate ID(s):: OSTI ID: 1206797

Journal Information:: Physical Review. B, Condensed Matter and Materials Physics, Vol. 92, Issue 2; ISSN 1098-0121

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 23 works

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Temperature dependent transport spin-polarization in the low Curie temperature complex itinerant ferromagnet EuTi _{1− x} Nb _x O ₃ Kamboj, Suman; Roy, Deepak K.; Roy, Susmita Journal of Physics: Condensed Matter, Vol. 31, Issue 41 https://doi.org/10.1088/1361-648x/ab2cbd	journal	July 2019
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