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Title: Dynamic interface rearrangement in LaFeO 3 / n SrTiO 3 heterojunctions

Authors:
; ; ;
Publication Date:
Sponsoring Org.:
USDOE
OSTI Identifier:
1407448
Resource Type:
Journal Article: Publisher's Accepted Manuscript
Journal Name:
Physical Review Materials
Additional Journal Information:
Journal Volume: 1; Journal Issue: 6; Related Information: CHORUS Timestamp: 2017-11-06 10:38:56; Journal ID: ISSN 2475-9953
Publisher:
American Physical Society
Country of Publication:
United States
Language:
English

Citation Formats

Spurgeon, Steven R., Sushko, Peter V., Chambers, Scott A., and Comes, Ryan B. Dynamic interface rearrangement in LaFeO 3 / n − SrTiO 3 heterojunctions. United States: N. p., 2017. Web. doi:10.1103/PhysRevMaterials.1.063401.
Spurgeon, Steven R., Sushko, Peter V., Chambers, Scott A., & Comes, Ryan B. Dynamic interface rearrangement in LaFeO 3 / n − SrTiO 3 heterojunctions. United States. doi:10.1103/PhysRevMaterials.1.063401.
Spurgeon, Steven R., Sushko, Peter V., Chambers, Scott A., and Comes, Ryan B. 2017. "Dynamic interface rearrangement in LaFeO 3 / n − SrTiO 3 heterojunctions". United States. doi:10.1103/PhysRevMaterials.1.063401.
@article{osti_1407448,
title = {Dynamic interface rearrangement in LaFeO 3 / n − SrTiO 3 heterojunctions},
author = {Spurgeon, Steven R. and Sushko, Peter V. and Chambers, Scott A. and Comes, Ryan B.},
abstractNote = {},
doi = {10.1103/PhysRevMaterials.1.063401},
journal = {Physical Review Materials},
number = 6,
volume = 1,
place = {United States},
year = 2017,
month =
}

Journal Article:
Free Publicly Available Full Text
This content will become publicly available on November 6, 2018
Publisher's Accepted Manuscript

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  • We demonstrate that LaFeO 3/n-SrTiO 3(001) heterojunctions engineered to have opposite interface polarities exhibit very similar band offsets and built-in potentials within the LaFeO 3 layer of the same sign. However, heterojunctions with the TiO20-LaO+ interface structure attract electronic charge from the n-STO substrate, whereas those with the SrO0-FeO2-1 interface structure do not. These results suggest that the latter would more effectively facilitate photogenerated electron-hole pair separation than the former, an important result for photoelectrochemical water splitting
  • The in-plane London penetration depth, λ ( T ) , was measured in single crystals of the iron-chalcogenide superconductors Fe 1.03 ( Te 0.63 Se 0.37 ) and Fe 1.06 ( Te 0.88 S 0.14 ) by using a radio-frequency tunnel diode resonator. Similar to the iron-arsenides and in stark contrast to the iron-phosphides, iron-chalcogenides exhibit a nearly quadratic temperature variation of λ ( T ) at low temperatures. The absolute value of the penetration depth in the T → 0 limit was determined for Fe 1.03 ( Te 0.63 Se 0.37 ) by using an Al coating technique, givingmore » λ ( 0 ) ≈ 560 ± 20 nm . The superfluid density ρ s ( T ) = λ 2 ( 0 ) / λ 2 ( T ) was fitted with a self-consistent two-gap γ model. While two different gaps are needed to describe the full-range temperature variation in ρ s ( T ) , a nonexponential low-temperature behavior requires pair-breaking scattering, and therefore an unconventional (e.g., s ± or nodal) order parameter.« less
  • Epimore » taxial La 1.85 Sr 0.15 CuO 4 / La 2 / 3 Ca 1 / 3 MnO 3 (LSCO/LCMO) superlattices (SL) on (001)- oriented LaSrAlO 4 substrates have been grown with pulsed laser deposition (PLD) technique. Their structural, magnetic and superconducting properties have been determined with in-situ reflection high energy electron diffraction (RHEED), x-ray diffraction, specular neutron reflectometry, scanning transmission electron microscopy (STEM), electric transport, and magnetization measurements. We find that despite the large mismatch between the in-plane lattice parameters of LSCO (a = 0.3779 nm) and LCMO (a = 0.387 nm) these superlattices can be grown epitaxially and with a high crystalline quality. While the first LSCO layer remains clamped to the LSAO substrate, a sizeable strain relaxation occurs already in the first LCMO layer. The following LSCO and LCMO layers adopt a nearly balanced state in which the tensile and compressive strain effects yield alternating in-plane lattice parameters with an almost constant average value. No major defects are observed in the LSCO layers, while a significant number of vertical antiphase boundaries are found in the LCMO layers. The LSCO layers remain superconducting with a relatively high superconducting onset temperature of T c onset ≈ 36 K. The macroscopic superconducting response is also evident in the magnetization data due to a weak diamagnetic signal below 10 K for H ∥ ab and a sizeable paramagnetic shift for H ∥ c that can be explained in terms of a vortex-pinning-induced flux compression. The LCMO layers maintain a strongly ferromagnetic state with a Curie temperature of T Curie ≈ 190 K and a large low-temperature saturation moment of about 3.5 (1) μ B. These results suggest that the LSCO/LCMO superlattices can be used to study the interaction between the antagonistic ferromagnetic and superconducting orders and, in combination with previous studies on YBCO/LCMO superlattices, may allow one to identify the relevant mechanisms.« less