Targeted chemical pressure yields tuneable millimetre-wave dielectric

Dawley, Natalie M.; Hagerstrom, Aaron M.; Olsen, Gerhard Henning; Holtz, Megan E.; Goian, Veronica; Kadlec, C.; Zhang, Jingshu; Lu, Xifeng; Drisko, Jasper; Uecker, R.; Ganschow, Steffen; Long, Christian J.; Booth, James C.; Kamba, S.; Fennie, Craig J.; Muller, David A.; Orloff, Nathan D.; Schlom, Darrell G.

doi:10.1038/s41563-019-0564-4

Cited by 33 publications

(21 citation statements)

References 43 publications

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“…) is yet to be exploited but materials with εr < 10 are likely to be utilised. [7][8][9][10] Low-band refers to available frequency ranges at < 1 GHz whereas midband will exploit 2-6 GHz interval and is the most widely deployed. To attain the required data transmission rates, massive MIMO (multiple input and multiple output) and Multi-User MIMO (MU-MIMO) antennas are employed that are composed of large numbers of interconnected devices.…”

Section: Millimeter Wave (Above 24 Ghzmentioning

confidence: 99%

Anomalous dielectric behaviour during the monoclinic to tetragonal phase transition in La(Nb_0.9V_0.1)O₄

Zhou

Guo

et al. 2021

Inorg. Chem. Front.

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Section: Millimeter Wave (Above 24 Ghzmentioning

confidence: 99%

Anomalous dielectric behaviour during the monoclinic to tetragonal phase transition in La(Nb_0.9V_0.1)O₄

Zhou

Guo

et al. 2021

Inorg. Chem. Front.

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“…We scanned a number of A 3 B 2 O 7 oxides, but could not find an example that undergoes a polar phase transition for dopings up to 0.5 e − per B site cation, which is already beyond what is experimentally achievable via methods such as electrostatic gating. In order to design a material which is closer to a structural phase transition than Sr 3 Sn 2 O 7 , we turn to targeted chemical pressure, which involves selectively substituting part of Sr ions with larger Ba cations [57]. While it is not always possible to order same charge cations in bulk, molecular beam epitaxy has been successfully used to obtain targeted chemical pressure in other RP phases (SrTiO 3 ) n (BaTiO 3 ) m SrO [57].…”

mentioning

confidence: 99%

“…In order to design a material which is closer to a structural phase transition than Sr 3 Sn 2 O 7 , we turn to targeted chemical pressure, which involves selectively substituting part of Sr ions with larger Ba cations [57]. While it is not always possible to order same charge cations in bulk, molecular beam epitaxy has been successfully used to obtain targeted chemical pressure in other RP phases (SrTiO 3 ) n (BaTiO 3 ) m SrO [57]. In Sr up to 10% of Ba ions are reported to preferentially substitute inequivalent Sr sites, however, the ordering tendencies depend sensitively on changes in the substitution amount [39].…”

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confidence: 99%

Free-Carrier-Induced Ferroelectricity in Layered Perovskites

Birol

2021

Phys. Rev. Lett.

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Doping ferroelectrics with carriers is often detrimental to polarization. This makes the design and discovery of metals that undergo a ferroelectric-like transition challenging. In this letter, we show from first principles that the oxygen octahedral rotations in perovskites are often enhanced by electron doping, and this can be used as a means to strengthen the structural polarization in certain hybrid-improper ferroelectrics -compounds in which the polarization is not stabilized by the long range Coulomb interactions but is instead induced by a trilinear coupling to octahedral rotations. We use this design strategy to predict a cation ordered Ruddlesden-Popper compound that can be driven into a metallic ferroelectric-like phase via electrolyte gating.

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“…In this sense, the work discussed in this contribution shows mechanistically how the chemical substitutions in a particular structure can modulate the chemical bonding and physical properties. The presented approach and gained knowledge presents a step beyond the canonical “chemical pressure” understanding of structure–property relationships, , and a call for other studies and more/different systems showing similar phenomenology to be explored.…”

Section: Discussionmentioning

confidence: 99%

One Structure, Two Elements—LuGe₂ Superconductor vs Ordinary Metallic Conductor LuSn₂. A Case Study on How Site-Selective Germanium for Tin Atom Substitution Leads to Modulating of the Charge Distribution

et al. 2020

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The substitution of chemically similar elements in a given crystal structure is an effective way to enhance physical properties, but the understanding on such improvements is usually impeded because the substitutions are random, and the roles of the different atoms cannot be distinguished by crystallographic symmetry. Herein, we provide a detailed crystallographic analysis and property measurements for the continuous solid solutions LuGe x Sn2–x (0 < x < 2). The results show that there is no apparent change of the global symmetry, with the end-members LuGe2 and LuSn2, as well as the intermediate LuGe x Sn2–x compositions adopting the ZrSi2 type structure (space group Cmcm, Pearson index oC12). Yet, the refinements of the crystal structures from single-crystal X-ray diffraction data show that Ge–Sn atom substitutions are not random, but occur preferentially at the zigzag chain. The patterned distribution of two group 14 elements leads to a significant variation in chemical bonding and charge ordering within the other structural fragment, the 2D square nets, thereby resulting in tuned electron transport. The enhancement is greater than that for the typical Bloch–Gruneisen model and more akin to that for the parallel-resistor model. Magnetization measurements on single crystals show bulk superconductivity in all LuGe x Sn2–x samples with shielding fractions as high as 90%. Specific heat data confirm the effect to originate from residual metallic tin in the material, indicating that Sn atom substitutions in the 2D square nets cause disruptions of the hypervalent bonding and local anisotropy, which ultimately leads to vanishing of the superconducting state in the end-member LuGe2. This work sheds light on how the complexity in chemical interactions by two different carbon congeners leads to changes in the physical properties and how they can be correlated with the induced charge distribution. These studies also provide a general approach to modulation of charge density and. thus, of emerging physical properties in other classes of intermetallic systems based on the main-group elements of groups 13 to 15.

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Targeted chemical pressure yields tuneable millimetre-wave dielectric

Cited by 33 publications

References 43 publications

Anomalous dielectric behaviour during the monoclinic to tetragonal phase transition in La(Nb_0.9V_0.1)O₄

Anomalous dielectric behaviour during the monoclinic to tetragonal phase transition in La(Nb_0.9V_0.1)O₄

Free-Carrier-Induced Ferroelectricity in Layered Perovskites

One Structure, Two Elements—LuGe₂ Superconductor vs Ordinary Metallic Conductor LuSn₂. A Case Study on How Site-Selective Germanium for Tin Atom Substitution Leads to Modulating of the Charge Distribution

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Targeted chemical pressure yields tuneable millimetre-wave dielectric

Cited by 33 publications

References 43 publications

Anomalous dielectric behaviour during the monoclinic to tetragonal phase transition in La(Nb0.9V0.1)O4

Anomalous dielectric behaviour during the monoclinic to tetragonal phase transition in La(Nb0.9V0.1)O4

Free-Carrier-Induced Ferroelectricity in Layered Perovskites

One Structure, Two Elements—LuGe2 Superconductor vs Ordinary Metallic Conductor LuSn2. A Case Study on How Site-Selective Germanium for Tin Atom Substitution Leads to Modulating of the Charge Distribution

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Anomalous dielectric behaviour during the monoclinic to tetragonal phase transition in La(Nb_0.9V_0.1)O₄

Anomalous dielectric behaviour during the monoclinic to tetragonal phase transition in La(Nb_0.9V_0.1)O₄

One Structure, Two Elements—LuGe₂ Superconductor vs Ordinary Metallic Conductor LuSn₂. A Case Study on How Site-Selective Germanium for Tin Atom Substitution Leads to Modulating of the Charge Distribution