Crystal Structure, Phase Transitions, and Magnetic Properties of Iridium Perovskites Sr<sub>2</sub>MIrO<sub>6</sub> (M = Ni, Zn)

Kayser, Paula; Martı́nez-Lope, M. J.; Alonso, J. A.; Retuerto, M.; Croft, Mark; Ignatov, Alexander; Fernández‐Díaz, M. T.

doi:10.1021/ic401161d

Cited by 59 publications

(80 citation statements)

References 43 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…These paramagnetic centers could be defects in the sample stemming from oxygen vacancies, chemical disorder (Y/Ir site mixing), off-stoichiometry, etc. A possible scenario could be the presence of Ir 4+ or Ir 6+ ions created by intermixing and/or off-stoichiometry [35,38,39].…”

Section: Resultsmentioning

confidence: 99%

Iridium double perovskite Sr2YIrO6 : A combined structural and specific heat study

et al. 2017

View full text Add to dashboard Cite

Recently, the iridate double perovskite Sr 2 YIrO 6 has attracted considerable attention due to the report of unexpected magnetism in this Ir 5+ (5d 4 ) material, in which according to the J eff model, a nonmagnetic ground state is expected. However, in recent works on polycrystalline samples of the series Ba 2−x Sr x YIrO 6 no indication of magnetic transitions have been found. We present a structural, magnetic, and thermodynamic characterization of Sr 2 YIrO 6 single crystals, with emphasis on the temperature and magnetic field dependence of the specific heat. As determined by x-ray diffraction, the Sr 2 YIrO 6 single crystals have a cubic structure, with space group F m3m. In agreement with the expected nonmagnetic ground state of Ir 5+ (5d 4 ) in Sr 2 YIrO 6 , no magnetic transition is observed down to 430 mK. Moreover, our results suggest that the low-temperature anomaly observed in the specific heat is not related to the onset of long-range magnetic order. Instead, it is identified as a Schottky anomaly caused by paramagnetic impurities present in the sample, of the order of n ∼ 0.5(2)%. These impurities lead to non-negligible spin correlations, which nonetheless, are not associated with long-range magnetic ordering.

show abstract

Section: Resultsmentioning

confidence: 99%

Iridium double perovskite Sr2YIrO6 : A combined structural and specific heat study

et al. 2017

View full text Add to dashboard Cite

show abstract

“…In particular, three different groups of XANES spectra can be distinguished at the L 3 edge in relation to the electronic state of Ir in Fig. 6 [32][33][34] In addition, we note that the occupation of the 5d orbitals may deviate from the nominal, integral valence occupation due to hybridization and band effects. For example, band-structure calculations yield n h = 5.37 for the number of holes in the related compound Sr 2 CoIrO 6 , a 11% deviation from the nominal 5d 4 configuration of Ir 5+ states.…”

Section: B Macroscopic Magnetizationmentioning

confidence: 89%

“…A detailed NPD structural study can be found elsewhere. [32][33][34] For the ordered phases, the structure was described in a monoclinic unit-cell, either I2/m (no. 12) or P2 1 /n (no.…”

Section: A Structural Characterizationmentioning

confidence: 99%

Electronic structure, local magnetism, and spin-orbit effects of Ir(IV)-, Ir(V)-, and Ir(VI)-based compounds

et al. 2015

Self Cite

View full text Add to dashboard Cite

Element-and orbital-selective x-ray absorption and magnetic circular dichroism measurements are carried out to probe the electronic structure and magnetism of Ir 5d electronic states in double perovskite Sr2MIrO6 (M=Mg, Ca, Sc, Ti, Ni, Fe, Zn, In) and La2NiIrO6 compounds. All the studied systems present a significant influence of spin-orbit interactions in the electronic ground state. In addition, we find that the Ir 5d local magnetic moment shows different character depending on the oxidation state despite the net magnetization being similar for all the compounds. Ir carries an orbital contribution comparable to the spin contribution for Ir 4+ (5d 5 ) and Ir 5+ (5d 4 ) oxides, whereas the orbital contribution is quenched for Ir 6+ (5d 3 ) samples. Incorporation of a magnetic 3d atom allows getting insight into the magnetic coupling between 5d and 3d transition metals. Together with previous susceptibility and neutron diffraction measurements the results indicate that Ir carries a significant local magnetic moment even in samples without a 3d metal. The size of the (small) net magnetization of these compounds is a result of predominant antiferromagnetic interactions between local moments coupled with structural details of each perovskite structure.

show abstract

“…Another possibility for the presence of Ir ions, µ ef f is reported to be more than 3 µ B /Ir [35]. Hence, the presence of a small amount of Ir…”

Section: Magnetizationmentioning

confidence: 99%

Ba2YIrO6: A cubic double perovskite material withIr5+ions

et al. 2016

View full text Add to dashboard Cite

Materials with a 5d 4 electronic configuration are generally considered to have a nonmagnetic ground state (J = 0). Interestingly, Sr2YIrO6 (Ir 5+ having 5d 4 electronic configuration) was recently reported to exhibit long-range magnetic order at low temperature and the distorted IrO6 octahedra were discussed to cause the magnetism in this material. Hence, a comparison of structurally distorted Sr2YIrO6 with cubic Ba2YIrO6 may shed light on the source of magnetism in such Ir 5+ materials with 5d 4 configuration. Besides, Ir 5+ materials having 5d 4 are also interesting in the context of recently predicted excitonic types of magnetism. Here we report a single-crystal-based analysis of the structural, magnetic, and thermodynamic properties of Ba2YIrO6. We observe that in Ba2YIrO6 for temperatures down to 0.4 K, long-range magnetic order is absent but at the same time correlated magnetic moments are present. We show that these moments are absent in fully relativistic ab initio band-structure calculations; hence, their origin is presently unclear.

show abstract

Crystal Structure, Phase Transitions, and Magnetic Properties of Iridium Perovskites Sr₂MIrO₆ (M = Ni, Zn)

Cited by 59 publications

References 43 publications

Iridium double perovskite Sr2YIrO6 : A combined structural and specific heat study

Iridium double perovskite Sr2YIrO6 : A combined structural and specific heat study

Electronic structure, local magnetism, and spin-orbit effects of Ir(IV)-, Ir(V)-, and Ir(VI)-based compounds

Ba2YIrO6: A cubic double perovskite material withIr5+ions

Contact Info

Product

Resources

About

Crystal Structure, Phase Transitions, and Magnetic Properties of Iridium Perovskites Sr2MIrO6 (M = Ni, Zn)

Cited by 59 publications

References 43 publications

Iridium double perovskite Sr2YIrO6 : A combined structural and specific heat study

Iridium double perovskite Sr2YIrO6 : A combined structural and specific heat study

Electronic structure, local magnetism, and spin-orbit effects of Ir(IV)-, Ir(V)-, and Ir(VI)-based compounds

Ba2YIrO6: A cubic double perovskite material withIr5+ions

Contact Info

Product

Resources

About

Crystal Structure, Phase Transitions, and Magnetic Properties of Iridium Perovskites Sr₂MIrO₆ (M = Ni, Zn)