Magnetic ground state of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:msub><mml:mi>Sr</mml:mi><mml:mn>2</mml:mn></mml:msub><mml:msub><mml:mi>IrO</mml:mi><mml:mn>4</mml:mn></mml:msub></mml:mrow></mml:math>and implications for second-harmonic generation

Matteo, S. Di; Norman, M. R.

doi:10.1103/physrevb.94.075148

Cited by 31 publications

(35 citation statements)

References 54 publications

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“…In order to compare iridium fluorides and iridates, we have expressed the experimental results presented above in terms of single-ion model parameters, such as the effective trigonal distortion ∆ of the cubic crystal field, and the spin-orbit-coupling constant ζ, often used in the literature of iridates 2, 43,44,[48][49][50][51][52][53][54][55] . By constraining the energies of the j eff = 3/2 excited states as calculated from the single-ion model to the energy positions of the features A and B, and by taking into account the sign of the octahedral distortion as determined by XRPD, we estimated the values of ∆ and ζ for our systems.…”

Section: Resultsmentioning

confidence: 99%

Possibility to realize spin-orbit-induced correlated physics in iridium fluorides

Rossi¹,

Retegan²,

Giacobbe³

et al. 2017

Phys. Rev. B

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Recent theoretical predictions of "unprecedented proximity" of the electronic ground state of iridium fluorides to the SU(2) symmetric j eff = 1/2 limit, relevant for superconductivity in iridates, motivated us to investigate their crystal and electronic structure. To this aim, we performed highresolution x-ray powder diffraction, Ir L3-edge resonant inelastic x-ray scattering, and quantum chemical calculations on Rb2[IrF6] and other iridium fluorides. Our results are consistent with the Mott insulating scenario predicted by Birol and Haule [Phys. Rev. Lett. 114, 096403 (2015)], but we observe a sizable deviation of the j eff = 1/2 state from the SU(2) symmetric limit. Interactions beyond the first coordination shell of iridium are negligible, hence the iridium fluorides do not show any magnetic ordering down to at least 20 K. A larger spin-orbit coupling in iridium fluorides compared to oxides is ascribed to a reduction of the degree of covalency, with consequences on the possibility to realize spin-orbit-induced strongly correlated physics in iridium fluorides.

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Section: Resultsmentioning

confidence: 99%

Possibility to realize spin-orbit-induced correlated physics in iridium fluorides

Rossi¹,

Retegan²,

Giacobbe³

et al. 2017

Phys. Rev. B

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“…The former may be a platform of topological superconductivity, 41,45,46,48) and the latter is parity-violating electromagnetic order. Experimental study traces back to magnetic monopole order in Cr 2 O 3 , 64) and recent studies found magnetic toroidal order in LiCoPO 4 , 65,66) magnetic quadrupole order in Sr 2 IrO 4 67,68) and Ba(TiO)Cu 4 (PO 4 ) 4 , 69) and odd-parity electric order in Cd 2 Re 2 O 7 . 70,71) Recent theoretical study has also identified magnetic hexadecapole order in BaMn 2 As 2 .…”

Section: Introductionmentioning

confidence: 81%

Magnetoelectric Response in Electric Octupole State: Possible Hidden Order in Cuprate Superconductors

Hitomi

Yanase

2019

J. Phys. Soc. Jpn.

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Motivated by recent studies of odd-parity multipole order in condensed matter physics, we theoretically study magnetoelectric responses in an electric octupole state. Investigating the Edelstein effect and spin Hall effect in a locally noncentrosymmetric bilayer Rashba model, we clarify characteristic properties due to parity violation in the electric octupole state. Furthermore, a possible realization of electric octupole order in bilayer high-T c cuprate superconductors is proposed. Our calculation of magnetic torque is consistent with recent experimental observation of a kink above the superconducting transition temperature. We also show significant enhancement of the in-plane anisotropy in spin susceptibility due to the superconductivity, and propose an experimental test by means of the nuclear magnetic resonance in the superconducting state. A spin-orbit coupled metal state in Cd 2 Re 2 O 7 is also discussed.

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“…Another topic of recent interest in locally NCS crystals is an odd-parity electromagnetic multipole order [25,28,[32][33][34][35][36][37][38][39][40][41][42][43], which spontaneously breaks global inversion symmetry through an anisotropic spin and charge distribution. Although previous studies provided a profound understanding of evenparity multipole order in strongly correlated electron systems [44][45][46][47], it has been recently recognized that odd-parity electromagnetic multipole order is ubiquitous in materials.…”

Section: Introductionmentioning

confidence: 99%

Odd-parity multipole fluctuation and unconventional superconductivity in locally noncentrosymmetric crystal

Ishizuka

Yanase

2018

Phys. Rev. B

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A microscopic calculation and symmetry argument reveal superconductivity in the vicinity of parity-violating magnetic order. In a crystal structure lacking local space inversion symmetry, an augmented cluster magnetic multipole order may break global inversion symmetry, and therefore it is classified into an odd-parity multipole order. We investigate unconventional superconductivity induced by an odd-parity magnetic multipole fluctuation in a two-dimensional two-sublattice Hubbard model motivated by Sr2IrO4. We find that even-parity superconductivity is more significantly suppressed by spin-orbit coupling than that in a globally noncentrosymmetric system. Consequently, two odd-parity superconducting states are stabilized by magnetic multipole fluctuations in a large spin-orbit coupling region. Both of them are identified as Z2 topological superconducting states. The obtained gap function of inter-sublattice pairing shows a gapped or nodal structure protected by nonsymmorphic symmetry. Our finding implies a family of odd-parity topological superconductors. Candidate materials are discussed.

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Magnetic ground state ofSr2IrO4and implications for second-harmonic generation

Cited by 31 publications

References 54 publications

Possibility to realize spin-orbit-induced correlated physics in iridium fluorides

Possibility to realize spin-orbit-induced correlated physics in iridium fluorides

Magnetoelectric Response in Electric Octupole State: Possible Hidden Order in Cuprate Superconductors

Odd-parity multipole fluctuation and unconventional superconductivity in locally noncentrosymmetric crystal

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