Observation of a Pseudogap in the Vicinity of the Metal–Insulator Transition in the Perovskite-type Vanadium Oxides Nd1−xSrxVO3

Colossal electroresistance (CER) in manganites, i.e., a large change in electrical resistance under the influence of either an applied electric field or an applied electric current, has often been described as complimentary to the colossal magnetoresistance (CMR) effect. Mixed valent vanadates with active t 2g and empty e g orbitals, unlike manganites, have not naturally been discussed in this context, as double exchange based CMR is not realizable in them. However, presence of coupled spin and orbital degrees of freedom, metal-insulator transition (MIT) accompanied by orbital order-disorder transition, etc., anyway make the vanadates an exciting group of materials. Here we probe a Fe-doped hollandite lead vanadate PbFe 1.75 V 4.25 O 11 (PFVO), which exhibits a clear MIT as a function of temperature. Most importantly, a giant fall in the resistivity, indicative of a CER, as well as a systematic shift in the MIT towards higher temperature are observed as a function of applied electric current. Detailed structural, magnetic, thermodynamic and transport studies point towards a complex interplay between orbital order/disorder effect, MIT and double exchange in this system.

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Colossal electroresistance response accompanied by metal-insulator transition in a mixed-valent vanadate

Saha

Bandyopadhyay²,

Schiesaro³

et al. 2021

Phys. Rev. B

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Revisiting the chemical potential shift in La2−xSrxCuO4 by means of hard and soft x-ray photoemission spectroscopy

Nagamoto,

Ootsuki,

Ishida

et al. 2024

Phys. Rev. B

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Metallic Surface State in the Bulk Insulating Phase of Ca₂₋_xSr_xRuO₄ (x = 0.06) Studied by Photoemission Spectroscopy

et al. 2022

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Observation of a Pseudogap in the Vicinity of the Metal–Insulator Transition in the Perovskite-type Vanadium Oxides Nd₁₋_xSr_xVO₃

Cited by 3 publications

References 34 publications

Colossal electroresistance response accompanied by metal-insulator transition in a mixed-valent vanadate

Colossal electroresistance response accompanied by metal-insulator transition in a mixed-valent vanadate

Revisiting the chemical potential shift in La2−xSrxCuO4 by means of hard and soft x-ray photoemission spectroscopy

Metallic Surface State in the Bulk Insulating Phase of Ca₂₋_xSr_xRuO₄ (x = 0.06) Studied by Photoemission Spectroscopy

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Observation of a Pseudogap in the Vicinity of the Metal–Insulator Transition in the Perovskite-type Vanadium Oxides Nd1−xSrxVO3

Cited by 3 publications

References 34 publications

Colossal electroresistance response accompanied by metal-insulator transition in a mixed-valent vanadate

Colossal electroresistance response accompanied by metal-insulator transition in a mixed-valent vanadate

Revisiting the chemical potential shift in La2−xSrxCuO4 by means of hard and soft x-ray photoemission spectroscopy

Metallic Surface State in the Bulk Insulating Phase of Ca2−xSrxRuO4 (x = 0.06) Studied by Photoemission Spectroscopy

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Product

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Observation of a Pseudogap in the Vicinity of the Metal–Insulator Transition in the Perovskite-type Vanadium Oxides Nd₁₋_xSr_xVO₃

Metallic Surface State in the Bulk Insulating Phase of Ca₂₋_xSr_xRuO₄ (x = 0.06) Studied by Photoemission Spectroscopy