Magnetic and electrical transport properties of 
<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:msub><mml:mi>YbFe</mml:mi><mml:mn>2</mml:mn></mml:msub><mml:msub><mml:mi mathvariant="normal">O</mml:mi><mml:mn>4</mml:mn></mml:msub></mml:mrow></mml:math>

Rai, Ram; Hinz, J.; Mckenna, D.; Pawlak, Jakub; DeMarco, M.

doi:10.1103/physrevb.100.045102

Cited by 5 publications

(2 citation statements)

References 40 publications

(64 reference statements)

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“…This calculation, where the condensation amplitude as well as the charge redistribution are self-consistently computed can be performed within the tight binding framework. [34][35][36] In particular, one can expect deviations from our result for the spatial change of ∆(x) on length scales of the order of the bulk coherence length ξ. Also, additional discrete states might appear as solutions of the Bogoliubov-de-Gennes equations at the junction, similar to the Andreev bound states found in Josephson junctions.…”

Section: Conclusion and Discussionmentioning

confidence: 90%

Spatial BCS-BEC crossover in superconducting p−n junctions

et al. 2020

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We present a theory of superconducting p-n junctions. To this end, we consider a two band model of doped bulk semiconductors with attractive interactions between the charge carriers and derive the superconducting order parameter, the quasiparticle density of states and the chemical potential as a function of the semiconductor gap ∆0 and the doping level ε. We verify previous results for the quantum phase diagram for a system with constant density of states in the conduction and valence band, which show BCS-Superconductor to Bose-Einstein-Condensation (BEC) and BEC to Insulator transitions as function of doping level and the size of the band gap. Then, we extend this formalism to a density of states which is more realistic for 3D systems and derive the corresponding quantum phase diagram, where we find that a BEC phase can only exist for small band gaps ∆0 < ∆ * 0 . For larger band gaps, we find rather a direct transition from an insulator to a BCS phase. Next, we apply this theory to study the properties of superconducting p-n junctions. We derive the spatial variation of the superconducting order parameter along the p-n junction. As the potential difference across the junction leads to energy band bending, we find a spatial crossover between a BCS and BEC condensate, as the density of charge carriers changes across the p-n junction. For the 2D system, we find two possible regimes, when the bulk is in a BCS phase, a BCS-BEC-BCS junction with a single BEC layer in the space charge region, and a BCS-BEC-I-BEC-BCS junction with two layers of BEC condensates separated by an insulating layer. In 3D we find that there can also be a conventional BCS-I-BCS junction for semiconductors with band gaps exceeding ∆ * 0 . Thus, we find that there can be BEC layers in the well controlled setting of doped semiconductors, where the doping level can be varied to change and control the thickness of BEC and insulator layers, making Bose Einstein Condensates thereby possibly accessible to experimental transport and optical studies in solid state materials.PACS numbers:

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Section: Conclusion and Discussionmentioning

confidence: 90%

Spatial BCS-BEC crossover in superconducting p−n junctions

et al. 2020

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“…YbFe 2 O 4 belongs to the group RFe 2 O 4 (R=Y, Dy to Lu) and is a new type of multiferroic material, which originated from the charge and spin frustrations. [1][2][3][4] The rhombohedral crystal structure (space group R3 ¯m) is characterized by an alternately stacked hexagonal bilayer of FeO 5 bipyramids and YbO 6 octahedra. 5) An incommensurate superstructure perpendicular to the c-axis develops at low temperatures.…”

Section: Introductionmentioning

confidence: 99%

Change in the defect structure of composition controlled single-phase YbFe₂O₄ epitaxial thin films

Shimamoto

Tanaka

Miura

et al. 2020

Jpn. J. Appl. Phys.

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A new type of ferroelectricity, originating from charge order and coupled to magnetism, occurs in YbFe2O4 containing triangular Fe/O double layers, which has recently generated great interest in this material. YbFe2O4 tolerates more than 10% iron deficiency even in bulk single crystals with space group R m. Even though a large number of Fe deficiencies are introduced in the thin film form due to vaporization of Fe ions during deposition at high temperatures, the crystal structure with the space group of R m in the films never changes within the Fe/Yb composition ratio from 1.3 to 2.2. In the previous research, the effects of the Fe/Yb composition ratio—especially in the large Fe deficient area (1.31–1.86)—on the lattice distortion and chemical bonding state of non-stoichiometric (0001)-oriented YbFe2O4 epitaxial thin films on (111) YSZ and (0001) sapphire substrates were examined. The variation of the lattice constant, Raman spectra, and optical absorption coefficient indicated that the existence of the stacking fault and the antisite Yb play an important role in the significant iron deficiency without changing the crystal structure of non-stoichiometric YbFe2O4 thin films.

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Scanning pulsed laser ablation in liquids: An alternative route to obtaining biocompatible YbFe nanoparticles as multiplatform contrast agents for combined MRI and CT imaging

Félix

Manuel

Litrán

et al. 2023

Ceramics International

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Magnetic and electrical transport properties of YbFe2O4

Cited by 5 publications

References 40 publications

Spatial BCS-BEC crossover in superconducting p−n junctions

Spatial BCS-BEC crossover in superconducting p−n junctions

Change in the defect structure of composition controlled single-phase YbFe₂O₄ epitaxial thin films

Scanning pulsed laser ablation in liquids: An alternative route to obtaining biocompatible YbFe nanoparticles as multiplatform contrast agents for combined MRI and CT imaging

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Magnetic and electrical transport properties of YbFe2O4

Cited by 5 publications

References 40 publications

Spatial BCS-BEC crossover in superconducting p−n junctions

Spatial BCS-BEC crossover in superconducting p−n junctions

Change in the defect structure of composition controlled single-phase YbFe2O4 epitaxial thin films

Scanning pulsed laser ablation in liquids: An alternative route to obtaining biocompatible YbFe nanoparticles as multiplatform contrast agents for combined MRI and CT imaging

Contact Info

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Change in the defect structure of composition controlled single-phase YbFe₂O₄ epitaxial thin films