Noncollinear antiferromagnetism of coupled spins and pseudospins in the double perovskite La2 CuIrO6

Kaustuv Manna; R. Sarkar; S. Fuchs; Y. A. Onykiienko; A. K. Bera; G. Aslan Cansever; S. Kamusella; A. Maljuk; C. G.F. Blum; L. T. Corredor; A. U.B. Wolter; S. M. Yusuf; M. Frontzek; L. Keller; M. Iakovleva; E. Vavilova; H. J. Grafe; V. Kataev; H. H. Klauss; D. S. Inosov; S. Wurmehl; B. Büchner

doi:10.1103/PhysRevB.94.144437

Noncollinear antiferromagnetism of coupled spins and pseudospins in the double perovskite La2 CuIrO6

Kaustuv Manna, R. Sarkar, S. Fuchs, Y. A. Onykiienko, A. K. Bera, G. Aslan Cansever, S. Kamusella, A. Maljuk, C. G.F. Blum, L. T. Corredor, A. U.B. Wolter, S. M. Yusuf, M. Frontzek, L. Keller, M. Iakovleva, E. Vavilova, H. J. Grafe, V. Kataev, H. H. Klauss, D. S. InosovS. Wurmehl, B. Büchner

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Abstract

We report the structural, magnetic, and thermodynamic properties of the double perovskite compound La2CuIrO6 from x-ray, neutron diffraction, neutron depolarization, dc magnetization, ac susceptibility, specific heat, muon-spin-relaxation (μSR), electron-spin-resonance (ESR) and nuclear magnetic resonance (NMR) measurements. Below ∼113 K, short-range spin-spin correlations occur within the Cu2+ sublattice. With decreasing temperature, the Ir4+ sublattice is progressively involved in the correlation process. Below T=74 K, the magnetic sublattices of Cu (spin s=12) and Ir (pseudospin j=12) in La2CuIrO6 are strongly coupled and exhibit an antiferromagnetic phase transition into a noncollinear magnetic structure accompanied by a small uncompensated transverse moment. A weak anomaly in ac susceptibility as well as in the NMR and μSR spin lattice relaxation rates at 54 K is interpreted as a cooperative ordering of the transverse moments which is influenced by the strong spin-orbit coupled 5d ion Ir4+. We argue that the rich magnetic behavior observed in La2CuIrO6 is related to complex magnetic interactions between the strongly correlated spin-only 3d ions with the strongly spin-orbit coupled 5d transition ions where a combination of the spin-orbit coupling and the low symmetry of the crystal lattice plays a special role for the spin structure in the magnetically ordered state.

Original language	English
Article number	144437
Journal	Physical Review B
Volume	94
Issue number	14
DOIs	https://doi.org/10.1103/PhysRevB.94.144437
State	Published - Oct 25 2016

Funding

Support from the German Research Foundation (DFG) within projects KA 1694/8-1 (V.K.), WU595/3-3 (S.W.), WO1532/3-2 (A.U.B.W.), and within the collaborative research center SFB 1143, projects B01 (S.W. and B.B.), C02 (R.S. and H.H.K.), and C03 (Y.A.O. and D.S.I.) is gratefully acknowledged. The work (E.V. and M.I.) has been supported in part by the Russian Foundation for Basic Research within project RFBR 14-02-01194.

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Manna, K., Sarkar, R., Fuchs, S., Onykiienko, Y. A., Bera, A. K., Cansever, G. A., Kamusella, S., Maljuk, A., Blum, C. G. F., Corredor, L. T., Wolter, A. U. B., Yusuf, S. M., Frontzek, M., Keller, L., Iakovleva, M., Vavilova, E., Grafe, H. J., Kataev, V., Klauss, H. H., ... Büchner, B. (2016). Noncollinear antiferromagnetism of coupled spins and pseudospins in the double perovskite La2 CuIrO6. Physical Review B, 94(14), Article 144437. https://doi.org/10.1103/PhysRevB.94.144437

@article{12e506fb1e52419580ca6c2caa4187cc,

title = "Noncollinear antiferromagnetism of coupled spins and pseudospins in the double perovskite La2 CuIrO6",

abstract = "We report the structural, magnetic, and thermodynamic properties of the double perovskite compound La2CuIrO6 from x-ray, neutron diffraction, neutron depolarization, dc magnetization, ac susceptibility, specific heat, muon-spin-relaxation (μSR), electron-spin-resonance (ESR) and nuclear magnetic resonance (NMR) measurements. Below ∼113 K, short-range spin-spin correlations occur within the Cu2+ sublattice. With decreasing temperature, the Ir4+ sublattice is progressively involved in the correlation process. Below T=74 K, the magnetic sublattices of Cu (spin s=12) and Ir (pseudospin j=12) in La2CuIrO6 are strongly coupled and exhibit an antiferromagnetic phase transition into a noncollinear magnetic structure accompanied by a small uncompensated transverse moment. A weak anomaly in ac susceptibility as well as in the NMR and μSR spin lattice relaxation rates at 54 K is interpreted as a cooperative ordering of the transverse moments which is influenced by the strong spin-orbit coupled 5d ion Ir4+. We argue that the rich magnetic behavior observed in La2CuIrO6 is related to complex magnetic interactions between the strongly correlated spin-only 3d ions with the strongly spin-orbit coupled 5d transition ions where a combination of the spin-orbit coupling and the low symmetry of the crystal lattice plays a special role for the spin structure in the magnetically ordered state.",

author = "Kaustuv Manna and R. Sarkar and S. Fuchs and Onykiienko, {Y. A.} and Bera, {A. K.} and Cansever, {G. Aslan} and S. Kamusella and A. Maljuk and Blum, {C. G.F.} and Corredor, {L. T.} and Wolter, {A. U.B.} and Yusuf, {S. M.} and M. Frontzek and L. Keller and M. Iakovleva and E. Vavilova and Grafe, {H. J.} and V. Kataev and Klauss, {H. H.} and Inosov, {D. S.} and S. Wurmehl and B. B{\"u}chner",

note = "Publisher Copyright: {\textcopyright} 2016 American Physical Society.",

year = "2016",

month = oct,

day = "25",

doi = "10.1103/PhysRevB.94.144437",

language = "English",

volume = "94",

journal = "Physical Review B",

issn = "2469-9950",

publisher = "American Physical Society",

number = "14",

}

Manna, K, Sarkar, R, Fuchs, S, Onykiienko, YA, Bera, AK, Cansever, GA, Kamusella, S, Maljuk, A, Blum, CGF, Corredor, LT, Wolter, AUB, Yusuf, SM, Frontzek, M, Keller, L, Iakovleva, M, Vavilova, E, Grafe, HJ, Kataev, V, Klauss, HH, Inosov, DS, Wurmehl, S & Büchner, B 2016, 'Noncollinear antiferromagnetism of coupled spins and pseudospins in the double perovskite La2 CuIrO6', Physical Review B, vol. 94, no. 14, 144437. https://doi.org/10.1103/PhysRevB.94.144437

TY - JOUR

T1 - Noncollinear antiferromagnetism of coupled spins and pseudospins in the double perovskite La2 CuIrO6

AU - Manna, Kaustuv

AU - Sarkar, R.

AU - Fuchs, S.

AU - Onykiienko, Y. A.

AU - Bera, A. K.

AU - Cansever, G. Aslan

AU - Kamusella, S.

AU - Maljuk, A.

AU - Blum, C. G.F.

AU - Corredor, L. T.

AU - Wolter, A. U.B.

AU - Yusuf, S. M.

AU - Frontzek, M.

AU - Keller, L.

AU - Iakovleva, M.

AU - Vavilova, E.

AU - Grafe, H. J.

AU - Kataev, V.

AU - Klauss, H. H.

AU - Inosov, D. S.

AU - Wurmehl, S.

AU - Büchner, B.

PY - 2016/10/25

Y1 - 2016/10/25

N2 - We report the structural, magnetic, and thermodynamic properties of the double perovskite compound La2CuIrO6 from x-ray, neutron diffraction, neutron depolarization, dc magnetization, ac susceptibility, specific heat, muon-spin-relaxation (μSR), electron-spin-resonance (ESR) and nuclear magnetic resonance (NMR) measurements. Below ∼113 K, short-range spin-spin correlations occur within the Cu2+ sublattice. With decreasing temperature, the Ir4+ sublattice is progressively involved in the correlation process. Below T=74 K, the magnetic sublattices of Cu (spin s=12) and Ir (pseudospin j=12) in La2CuIrO6 are strongly coupled and exhibit an antiferromagnetic phase transition into a noncollinear magnetic structure accompanied by a small uncompensated transverse moment. A weak anomaly in ac susceptibility as well as in the NMR and μSR spin lattice relaxation rates at 54 K is interpreted as a cooperative ordering of the transverse moments which is influenced by the strong spin-orbit coupled 5d ion Ir4+. We argue that the rich magnetic behavior observed in La2CuIrO6 is related to complex magnetic interactions between the strongly correlated spin-only 3d ions with the strongly spin-orbit coupled 5d transition ions where a combination of the spin-orbit coupling and the low symmetry of the crystal lattice plays a special role for the spin structure in the magnetically ordered state.

AB - We report the structural, magnetic, and thermodynamic properties of the double perovskite compound La2CuIrO6 from x-ray, neutron diffraction, neutron depolarization, dc magnetization, ac susceptibility, specific heat, muon-spin-relaxation (μSR), electron-spin-resonance (ESR) and nuclear magnetic resonance (NMR) measurements. Below ∼113 K, short-range spin-spin correlations occur within the Cu2+ sublattice. With decreasing temperature, the Ir4+ sublattice is progressively involved in the correlation process. Below T=74 K, the magnetic sublattices of Cu (spin s=12) and Ir (pseudospin j=12) in La2CuIrO6 are strongly coupled and exhibit an antiferromagnetic phase transition into a noncollinear magnetic structure accompanied by a small uncompensated transverse moment. A weak anomaly in ac susceptibility as well as in the NMR and μSR spin lattice relaxation rates at 54 K is interpreted as a cooperative ordering of the transverse moments which is influenced by the strong spin-orbit coupled 5d ion Ir4+. We argue that the rich magnetic behavior observed in La2CuIrO6 is related to complex magnetic interactions between the strongly correlated spin-only 3d ions with the strongly spin-orbit coupled 5d transition ions where a combination of the spin-orbit coupling and the low symmetry of the crystal lattice plays a special role for the spin structure in the magnetically ordered state.

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U2 - 10.1103/PhysRevB.94.144437

DO - 10.1103/PhysRevB.94.144437

M3 - Article

AN - SCOPUS:84994201531

SN - 2469-9950

VL - 94

JO - Physical Review B

JF - Physical Review B

IS - 14

M1 - 144437

ER -

Noncollinear antiferromagnetism of coupled spins and pseudospins in the double perovskite La2 CuIrO6

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