Strong quantum fluctuations from competition between magnetic phases in a pyrochlore iridate

Jacobsen, Henrik; Dashwood, C. D.; Lhotel, Elsa; Khalyavin, D. D.; Manuel, Pascal; Stewart, J. R.; Prabhakaran, D.; McMorrow, D. F.; Boothroyd, A. T.

doi:10.1103/physrevb.101.104404

Cited by 10 publications

(28 citation statements)

References 65 publications

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“…29 Beside the majority A 2 Ir 2 O 7 phase, the contributions of unreacted A 2 O 3 and Ir also were traced out in diffraction data (see Figure 1). We note that previously prepared pyrochlore iridate samples always contained a small amount of secondary phases, 6,11,21,26,28,30 stemming from a high volatility of IrO 2 . Compared to the previous results, the content of secondary phases in our samples (less than 3% inspecting diffraction patterns) is well below the average.…”

Section: Sample Synthesis Experimental Methodsmentioning

confidence: 85%

“…The CF and external magnetic field acting on the Tm 3+ 25,26 or scaled parameters using our in-house computer codes. 34…”

Section: Sample Synthesis Experimental Methodsmentioning

confidence: 99%

“…21,24,25 Very recently, the neutron diffraction experiments on Yb 2 Ir 2 O 7 and, more importantly, on Lu 2 Ir 2 O 7 revealed several magnetic peaks consistent with the AIAO magnetic structure. 26 The short/ long range magnetic ordering of the Ir sublattice is often discussed also with respect to the change in conducting properties. Metallic (A = Pr and Nd) or semimetallic/ nonmetallic A 2 Ir 2 O 7 (A = heavier rare-earth element) become insulatorsmetal to insulator transition, MITat (similar) temperature below which the Ir 4+ moments commence to strongly correlate.…”

Section: Introductionmentioning

confidence: 99%

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Characterization and Magnetic Properties of Heavy Rare-Earth A₂Ir₂O₇ Pyrochlore Iridates, the Case of Tm₂Ir₂O₇

2020

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The magnetic properties of newly prepared Tm 2 Ir 2 O 7 were investigated by means of magnetization and specific heat measurements and compared to the properties of other heavy rare-earth pyrochlore iridates. A bifurcation of zero-field-cooled and fieldcooled magnetization coinciding with the onset of the specific heat anomaly indicated the magnetic ordering of the Ir sublattice, in agreement with studies on other pyrochlore iridates. The phase diagram depicting the ordering/metal-insulator-transition temperature dependent on the rare-earth ionic radius was updated and completed. Magnetic dc susceptibilities and magnetic contributions to the specific heat of Er, Tm, and Yb analogues were well described by crystal field parameters and eigenenergies, previously reported for Er 2 Ir 2 O 7 and Yb 2 Ir 2 O 7 . The crystal field parameters for, the so-far-unstudied, Tm 2 Ir 2 O 7 were calculated by scaling the Er 2 Ir 2 O 7 parameters employing appropriate Stevens factors for Er 3+ and Tm 3+ . Iridates with the Kramers' Er 3+ and Yb 3+ ions revealed a splitting of the ground-state doublet, leading to a broad anomaly in specific heat at around 2 K and 3 K, respectively. The previously reported low value of magnetic moment in Yb 2 Ir 2 O 7 was confirmed by magnetization measurements. The nonmagnetic ground-state crystal-field singlet in Tm 2 Ir 2 O 7 dictated by Tm trigonal Wyckoff position was confirmed by both evolution of specific heat at low temperature and temperature dependence of the magnetic entropy.

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Section: Sample Synthesis Experimental Methodsmentioning

confidence: 85%

“…The CF and external magnetic field acting on the Tm 3+ 25,26 or scaled parameters using our in-house computer codes. 34…”

Section: Sample Synthesis Experimental Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Characterization and Magnetic Properties of Heavy Rare-Earth A₂Ir₂O₇ Pyrochlore Iridates, the Case of Tm₂Ir₂O₇

2020

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“…The pyrochlore-structure 5d oxides Cd 2 Os 2 O 7 and A 2 Ir 2 O 7 also have metal-to-insulator transitions which coincide with magnetic order, but these cannot be Slater transitions because the magnetic order has propagation vector k = 0 which does not change the periodicity of the crystal potential [10,[49][50][51][52]. The magnetic order in Pb 2 CaOsO 6 , on the other hand, has propagation vector k = ( 1 2 , 1 2 , 0).…”

Section: Discussionmentioning

confidence: 99%

Magnetically induced metal-insulator transition in Pb2CaOsO6

et al. 2020

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We report on the structural, magnetic, and electronic properties of two new double-perovskites synthesized under high pressure, Pb 2 CaOsO 6 and Pb 2 ZnOsO 6 . Upon cooling below 80 K, Pb 2 CaOsO 6 simultaneously undergoes a metal-to-insulator transition and develops antiferromagnetic order. Pb 2 ZnOsO 6 , on the other hand, remains a paramagnetic metal down to 2 K. The key difference between the two compounds lies in their crystal structures. The Os atoms in Pb 2 ZnOsO 6 are arranged on an approximately face-centered cubic lattice with strong antiferromagnetic nearest-neighbor exchange couplings. The geometrical frustration inherent to this lattice prevents magnetic order from forming down to the lowest temperatures. In contrast, the unit cell of Pb 2 CaOsO 6 is heavily distorted up to at least 500 K including antiferroelectriclike displacements of the Pb and O atoms despite metallic conductivity above 80 K. This distortion relieves the magnetic frustration, facilitating magnetic order which, in turn, drives the metal-insulator transition. Our results suggest that the phase transition in Pb 2 CaOsO 6 is spin driven and could be a rare example of a Slater transition.

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“…The pyrochlore-structure 5d oxides Cd 2 Os 2 O 7 and A 2 Ir 2 O 7 also have metal-insulator transitions which coincide with magnetic order, but these cannot be Slater transitions because the magnetic order has propagation vector k = 0 which does not change the periodicity of the crystal potential. 10,[48][49][50][51] . The magnetic order in Pb 2 CaOsO 6 , on the other hand, has propagation vector k = ( 12 , 1 2 , 0).…”

Section: Discussionmentioning

confidence: 99%

Magnetically induced metal-insulator transition in Pb2CaOsO6

Jacobsen,

Feng,

Princep

et al. 2020

Preprint

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We report on the structural, magnetic, and electronic properties of two new double-perovskites synthesized under high pressure; Pb2CaOsO6 and Pb2ZnOsO6. Upon cooling below 80 K, Pb2CaOsO6 simultaneously undergoes a metal-insulator transition and develops antiferromagnetic order. Pb2ZnOsO6, on the other hand, remains a paramagnetic metal down to 2 K. The key difference between the two compounds lies in their crystal structure. The Os atoms in Pb2ZnOsO6 are arranged on an approximately face-centred cubic lattice with strong antiferromagnetic nearestneighbor exchange couplings. The geometrical frustration inherent to this lattice prevents magnetic order from forming down to the lowest temperatures. In contrast, the unit cell of Pb2CaOsO6 is heavily distorted up to at least 500 K, including antiferroelectric-like displacements of the Pb and O atoms despite metallic conductivity above 80 K. This distortion relieves the magnetic frustration, facilitating magnetic order which in turn drives the metal-insulator transition. Our results suggest that the phase transition in Pb2CaOsO6 is spin-driven, and could be a rare example of a Slater transition.

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Strong quantum fluctuations from competition between magnetic phases in a pyrochlore iridate

Cited by 10 publications

References 65 publications

Characterization and Magnetic Properties of Heavy Rare-Earth A₂Ir₂O₇ Pyrochlore Iridates, the Case of Tm₂Ir₂O₇

Characterization and Magnetic Properties of Heavy Rare-Earth A₂Ir₂O₇ Pyrochlore Iridates, the Case of Tm₂Ir₂O₇

Magnetically induced metal-insulator transition in Pb2CaOsO6

Magnetically induced metal-insulator transition in Pb2CaOsO6

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Strong quantum fluctuations from competition between magnetic phases in a pyrochlore iridate

Cited by 10 publications

References 65 publications

Characterization and Magnetic Properties of Heavy Rare-Earth A2Ir2O7 Pyrochlore Iridates, the Case of Tm2Ir2O7

Characterization and Magnetic Properties of Heavy Rare-Earth A2Ir2O7 Pyrochlore Iridates, the Case of Tm2Ir2O7

Magnetically induced metal-insulator transition in Pb2CaOsO6

Magnetically induced metal-insulator transition in Pb2CaOsO6

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Characterization and Magnetic Properties of Heavy Rare-Earth A₂Ir₂O₇ Pyrochlore Iridates, the Case of Tm₂Ir₂O₇

Characterization and Magnetic Properties of Heavy Rare-Earth A₂Ir₂O₇ Pyrochlore Iridates, the Case of Tm₂Ir₂O₇