Possible high-pressure orbital quantum criticality and an emergent resistive phase in PbRuO<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msub><mml:mrow /><mml:mn>3</mml:mn></mml:msub></mml:math>

Kusmartseva, Anna F.; Sinclair, A. C. E.; Rodgers, Jennifer; Kimber, Simon A. J.; Attfield, J. Paul

doi:10.1103/physrevb.87.165130

Cited by 7 publications

(3 citation statements)

References 27 publications

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“…Most striking is a single Pb–Ru distance as short as 2.6 Å, about 0.6 Å shorter than the average value, which is reduced only slightly on traversing P c . Kusmartseva et al [46] have also found independently the pressure-induced phase transition at P ≈ 30 GPa by their structural study under high pressure. They have given only the change of lattice parameters on crossing the phase boundary.…”

Section: Data and Discussionmentioning

confidence: 94%

“…A power-law analysis of the low-temperature resistivity ρ ( T ) = ρ o + aT n to obtain the x dependence of n is shown in figure 7(c); the minimum n at x = 0.6 indicates that suppression of the magnetism is associated with the existence of a quantum critical point (QCP); the second minimum of n ( x ) at x 0.9 is a QCP associated with the appearance of the low-temperature Imma phase of perovskite PbRuO 3 . The low-temperature Imma phase can be suppressed by applying hydrostatic pressure [13, 46]. Kusmartseva et al [46] have monitored the transition by measuring resistivity ρ ( T ) under different pressures.…”

Section: Data and Discussionmentioning

confidence: 99%

“…The low-temperature Imma phase can be suppressed by applying hydrostatic pressure [13, 46]. Kusmartseva et al [46] have monitored the transition by measuring resistivity ρ ( T ) under different pressures. They have found that the phase transition temperature T t lowers gradually as pressure increases; it vanishes at about 5 GPa.…”

Section: Data and Discussionmentioning

confidence: 99%

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Varied roles of Pb in transition-metal PbMO₃perovskites (M= Ti, V, Cr, Mn, Fe, Ni, Ru)

Goodenough¹,

Zhou²

2015

Science and Technology of Advanced Materials

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Different structural chemistries resulting from the Pb2+ lone-pair electrons in the PbMO3 perovskites are reviewed. The Pb2+ lone-pair electrons enhance the ferroelectric transition temperature in PbTiO3, stabilize vanadyl formation in PbVO3, and induce a disproportionation reaction of CrIV in PbCrO3. A Pb2+ + NiIV = Pb4+ + NiII reaction in PbNiO3 stabilizes the LiNbO3 structure at ambient pressure, but an A-site Pb4+ in an orthorhombic perovskite PbNiO3 is stabilized at modest pressures at room temperature. In PbMnO3, a ferroelectric displacement due to the lone pair electron effect is minimized by the spin–spin exchange interaction and the strong octahedral site preference of the MnIV/III cation. PbRuO3 is converted under pressure from the defective pyrochlore to the orthorhombic (Pbnm) perovskite structure where Pb–Ru interactions via a common O −2p orbital stabilize at low temperature a metallic Imma phase at ambient pressure. Above Pc a covalent Pb–Ru bond is formed by Pb2+ + RuIV = Pb4+ + RuII electron sharing.

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Section: Data and Discussionmentioning

confidence: 94%