Modifying Jahn-Teller distortion by epitaxial stress in LaMnO3 films for tunning electron localization

Author(s):  
Xin Chen ◽  
Baohua Wang ◽  
Tongxin Ge ◽  
Haoming Wei ◽  
Bingqiang Cao

Abstract The effect of epitaxial stress on Jahn-Teller distortion in epitaxial LaMnO3 (LMO) films has been investigated. Both 2θ-ω scans and reciprocal space maps indicate that LMO samples are subjected to compressive stress. Obvious Laue oscillations can be detected in 2θ-ω scans, indicating the high quality of samples. Reciprocal space maps of symmetry peak (001) and asymmetry peak (-103) imply different epitaxial stress for LMO films deposited on different substrates. Raman spectra measurements reveal that the degree of Jahn-Teller distortion can be well tuned via the epitaxial stress which may further influence on the electron localization in the films. This study might benefit to understanding the correlation between crystalline structure and electrical transport properties of LMO films and related LMO-based superlattices.

1994 ◽  
Vol 299 ◽  
Author(s):  
B. K. Meyer ◽  
D. M. Hofmann ◽  
W. Stadler ◽  
P. Emanuelsson ◽  
P. Omling ◽  
...  

AbstractBoth the cadmium vacancy (Vcd) and the tellurium vacancy (VTe) in CdTe are identified by means of electron paramagnetic resonance (EPR). The Vcd is a double acceptor and the EPR spectrum is observed in its single negative charge state. The symmetry is found to be trigonal, which can be explained in a model in which the hole occupies a dangling bond t2 orbital and the orbital degeneracy is removed by a static Jahn-Teller distortion. The hyperfine interaction shows that the hole is localised on one of the four Te neighbours. The EPR spectrum of VTe+ reveals cubic (unperturbed) symmetry and the hyperfine structure shows that the unpaired electron is equally spread over the four Cd neighboursPhoto-EPR measurements locate the 0/+ state of VTe at Ev + 0.2 eV and the 2-/- acceptor level of VCd to be situated less than 0.47 eV above the valence band.


2019 ◽  
Vol 6 (9) ◽  
pp. 095060
Author(s):  
H A Martinez-Rodriguez ◽  
M H Bocanegra-Bernal ◽  
V Orozco-Carmona ◽  
G Herrera-Pérez ◽  
J A Matutes-Aquino ◽  
...  

2010 ◽  
Vol 23 (5) ◽  
pp. 055007 ◽  
Author(s):  
Yuri Eltsev ◽  
Sergey Lee ◽  
Koichi Nakao ◽  
Setsuko Tajima

1993 ◽  
Vol 302 ◽  
Author(s):  
B. K. Meyer ◽  
D. M. Hofmann ◽  
W. Stadler ◽  
P. Emanuelsson ◽  
P. Omling ◽  
...  

ABSTRACTBoth the cadmium vacancy (Vcd) and the tellurium vacancy (VTe) in CdTe are identified by means of electron paramagnetic resonance (EPR). The VCd is a double acceptor and the EPR spectrum is observed in its single negative charge state. The symmetry is found to be trigonal, which can be explained in a model in which the hole occupies a dangling bond t2 orbital and the orbital degeneracy is removed by a static Jahn-Teller distortion. The hyperfine interaction shows that the hole is localised on one of the four Te neighbours. The EPR spectrum of VTe+ reveals cubic (unperturbed) symmetry and the hyperfine structure shows that the unpaired electron is equally spread over the four Cd neighbours.Photo-EPR measurements locate the 0/+ state of VTe at Ev + 0.2 eV and the 2−/− acceptor level of VCd to be situated less than 0.47 eV above the valence band.


2003 ◽  
Vol 15 (12) ◽  
pp. 2033-2043 ◽  
Author(s):  
Liangbing Hu ◽  
Wei Tong ◽  
Hong Zhu ◽  
Yuheng Zhang

2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Christian Paulsen ◽  
Christopher Benndorf ◽  
Daniel Günther ◽  
Oliver Oeckler ◽  
Helena Osthues ◽  
...  

Abstract Linarite, PbCuSO4(OH)2, crystallizes as secondary mineral in form of clusters of crystals in Mine du Pradet at Cap Garonne in France. A tiny single crystal was isolated and its structure was refined from synchrotron diffraction data (λ = 0.049592 nm): P121/m1, a = 467.75(2), b = 563.48(4), c = 967.64(5) pm, β = 102.647(5)°, wR = 0.0544, 819 F 2 values and 56 variables. The proton positions were also refined. The Cu2+ cations are located within Cu(OH)2 ribbons and exhibit pronounced Jahn-Teller distortion (d(Cu–O): 2 × 191.9, 2 × 197.3 and 2 × 252.8 pm). The Cu(OH)2 ribbons are condensed with the sulfate tetrahedra and the lead cations. The latter are coordinated to eight oxygen atoms in a slightly anisotropic manner. Calculations of the electron localization function (ELF) of PbO (litharge), PbSO4 (anglesite) and PbCuSO4(OH)2 (linarite) show pronounced lone-pair character for PbO but rather isotropic ELF values around the lead cations in PbSO4 and PbCuSO4(OH)2.


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