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Torre, A. de la; Walker, S. McKeown; Bruno, F. Y.; Riccó, Sara; Wang, Zhiming; Lezama, Ignacio Gutiérrez; Scheerer, Gernot; Giriat, G.; Jaccard, D.; Berthod, Christophe; Kim, T. K.; Hoesch, Moritz; Hunter, Emily C.; Perry, Robin; Tamai, Anna; Baumberger, F.

doi:10.1103/physrevlett.115.176402

Cited by 170 publications

(246 citation statements)

References 37 publications

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“…where ∂ρ ∂T changes sign) of the highest measured La concentration (x = 0.06) at T ≈ 100K does not directly coincide with the onset of irreversibility in the low field susceptibility at T AF ≈ 125 K. We note here that this minimum in conductivity decoupled from the onset of AF order is similar to the tunneling transport behavior observed in other lightly doped Mott states such as the high-T C cuprates 45,46 . A recent angle-resolved photoemission study's report of a pseudogap in La-doped Sr-214 is also consistent with our observation of a gradual gapping out of conductivity at low temperatures 47 . In analyzing the metallic behavior at high temperatures within the two-dimensional limit of planar transport, the high temperature resistivity for the x = 0.06 sample appears to violate the Mott limit for metallic transport where k f l ≈ 0.6 < 1 48 .…”

Section: Discussionsupporting

confidence: 79%

Influence of electron doping on the ground state of(Sr1−xLax)2IrO4

et al. 2015

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The evolution of the electronic properties of electron-doped (Sr1−xLax)2IrO4 is experimentally explored as the doping limit of La is approached. As electrons are introduced, the electronic ground state transitions from a spin-orbit Mott phase into an electronically phase separated state, where long-range magnetic order vanishes beyond x = 0.02 and charge transport remains percolative up to the limit of La substitution (x ≈ 0.06). In particular, the electronic ground state remains inhomogeneous even beyond the collapse of the parent state's long-range antiferromagnetic order, while persistent short-range magnetism survives up to the highest La-substitution levels. Furthermore, as electrons are doped into Sr2IrO4, we observe the appearance of a low temperature magnetic glass-like state intermediate to the complete suppression of antiferromagnetic order. Universalities and differences in the electron-doped phase diagrams of single layer and bilayer Ruddlesden-Popper strontium iridates are discussed.

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Section: Discussionsupporting

confidence: 79%

Influence of electron doping on the ground state of(Sr1−xLax)2IrO4

et al. 2015

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“…La-doped Sr 2 IrO 4 single crystals have only become available in the last couple of years [21][22][23] , but angle-resolved photoemission studies on them 21,22 do not fully reproduce the observations made via the in situ doping method 12,16 . While it is unclear at the moment what leads to such differences between the two doping methods, we note that a well-defined quasiparticle peak is absent for any doping level in La-doped samples, indicating suppressed coherent motion of doped electrons presumably due to disorder created by chemical doping.…”

Section: Introductionmentioning

confidence: 99%

Crystal growth and intrinsic magnetic behaviour of Sr₂IrO₄

Sung

Gretarsson

Proepper

et al. 2016

Philosophical Magazine

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We report on the growth of stoichiometric Sr2IrO4 single crystals, which allow us to unveil their intrinsic magnetic properties. The effect of different growth conditions has been investigated for crystals grown by the flux method. We find that the magnetic response depends very sensitively on the details of the growth conditions. We assess the defect concentration based on magnetization, X-ray diffraction, Raman scattering, and optical conductivity measurements. We find that samples with a low concentration of electronically active defects show much reduced in-gap spectral weight in the optical conductivity and a pronounced two-magnon peak in the Raman scattering spectrum. A prolonged exposure at high temperature during the growth leads to higher defect concentration likely due to creation of oxygen vacancies. We further demonstrate a systematic intergrowth of Sr2IrO4 and Sr3Ir2O7 phases by varying the growth temperature. Our results thus emphasize that revealing the intrinsic magnetic properties of Sr2IrO4 and related materials requires a scrupulous control of the crystal growth process.

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“…Based on these similarities, the appearance of superconductivity has been speculated, 3 and recently experimental evidences have started to emerge suggesting this could indeed be the case, 4,5 or at least that some Fermi surface features are very similar to underdoped cuprates. 6 These systems are also interesting because the role of spin-orbit coupling in the electronic structure is not completely clear, in particular it has been under debate what causes the insulating behavior in Sr 2 IrO 4 , whether the system is a Mott or a Slater insulator. [7][8][9][10][11][12] One of the keys to answer this question is to describe the electronic state the one t 2g hole is in.…”

Section: Introductionmentioning

confidence: 99%

Noncollinear versus collinear description of the Ir-based one-t2g-hole perovskite-related compounds:SrIrO3andSr2
Lado
¹
,
Pardo
²

2015
Phys. Rev. B
12
5
8
0
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We present an analysis of the electronic structure of perovskite-related iridates, 5d electron compounds where a subtle interplay between spin-orbit coupling, tetragonal distortions and electron correlations determines the electronic structure properties. We suggest via electronic structure calculations that a non-collinear calculation is required to obtain solutions close to the usually quoted j ef f = 1/2 state to describe the t2g hole in the Ir 4+ :d 5 cation, while a collinear calculation yields a different solution, the hole is in a simpler xz/yz complex combination with a smaller Lz/Sz ratio. We describe what the implications of this are in terms of the electronic structure; surprisingly, both solutions barely differ in terms of their band structure, and are similar to the one obtained by a tight binding model involving t2g orbitals with mean field interactions. We also analyze how the electronic structure and magnetism evolve with strain, spin-orbit coupling strength and on-site Coulomb repulsion; we suggest the way the band structure gets modified and draw some comparisons with available experimental observations.

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Collapse of the Mott Gap and Emergence of a Nodal Liquid in Lightly DopedSr2IrO4

Cited by 170 publications

References 37 publications

Influence of electron doping on the ground state of(Sr1−xLax)2IrO4

Influence of electron doping on the ground state of(Sr1−xLax)2IrO4

Crystal growth and intrinsic magnetic behaviour of Sr₂IrO₄

Noncollinear versus collinear description of the Ir-based one-t2g-hole perovskite-related compounds:SrIrO3andSr2
Lado
¹
,
Pardo
²

2015
Phys. Rev. B
12
5
8
0
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Collapse of the Mott Gap and Emergence of a Nodal Liquid in Lightly DopedSr2IrO4

Cited by 170 publications

References 37 publications

Influence of electron doping on the ground state of(Sr1−xLax)2IrO4

Influence of electron doping on the ground state of(Sr1−xLax)2IrO4

Crystal growth and intrinsic magnetic behaviour of Sr2IrO4

Noncollinear versus collinear description of the Ir-based one-t2g-hole perovskite-related compounds:SrIrO3andSr2Lado1, Pardo2 2015Phys. Rev. B12580View full textAdd to dashboardCite

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Crystal growth and intrinsic magnetic behaviour of Sr₂IrO₄

Noncollinear versus collinear description of the Ir-based one-t2g-hole perovskite-related compounds:SrIrO3andSr2
Lado
¹
,
Pardo
²

2015
Phys. Rev. B
12
5
8
0
View full text Add to dashboard Cite