Nodeless superconductivity and the peak effect in the quasiskutterudites 
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Weng, Z. F.; Smidman, M.; Pang, G. M.; Prakash, Om; Chen, Yanni; Zhang, Y. J.; Ramakrishnan, S.; Yuan, Huiqiu

doi:10.1103/physrevb.95.184501

Cited by 13 publications

(10 citation statements)

References 48 publications

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“…Considering that we find the 1/1 superlattice to be metallic, a more systematic study comparing the properties of bulk solid solutions with short-period superlattices of similar composition would be instructive. Note that DFT+U calculations for magnetically ordered LaVO 3 /LaTiO 3 superlattices also found the 1/1 case with layering perpendicular to [001] to be metallic, in agreement with our DFT+DMFT results, while other stacking directions turned out to be insulating [29]. Another study addressed the role of strain and polarity at interfaces of LaVO 3 and LaTiO 3 with various substrates [30], and suggested that the insulator-to-metal transition in both materials is due to a complex interplay of structural, and electronic degrees of freedom that affects the two materials in different ways.…”

Section: Discussionsupporting

confidence: 88%

“…However, our calculations show that for all considered multilayers the charge transfer at the LaVO 3 /LaTiO 3 interface is in the opposite direction, i.e., charge is transferred from the Ti cations in LaTiO 3 to the V cations in LaVO 3 , thereby increasing the charge imbalance of the d states at the interface. This is also in qualitative agreement with recent DFT+U calculations for magnetically ordered LaVO 3 /LaTiO 3 superlattices [29]. Furthermore, the charge transfer is strongly localized at the interface, converging back to bulk-like occupations within only three layers.…”

Section: B Charge Transfersupporting

confidence: 91%

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Charge transfer in LaVO3/LaTiO3 multilayers: Strain-controlled dimensionality of interface metallicity between two Mott insulators

Beck

Ederer

2019

Phys. Rev. Materials

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We use density functional theory plus dynamical mean-field theory to demonstrate the emergence of a metallic layer at the interface between the two Mott insulators LaTiO3 and LaVO3. The metallic layer is due to charge transfer across the interface, which alters the valence state of the transition metal cations close to the interface. Somewhat counter-intuitively, the charge is transferred from the Ti cations with formal d 1 electron configuration to the the V cations with formal d 2 configuration, thereby increasing the occupation difference of the t2g states. This can be understood as a result of a gradual transition of the charge transfer energy, or electronegativity, across the interface. The spatial extension of the metallic layer, in particular towards the LaTiO3 side, can be controlled by epitaxial strain, with tensile strain leading to a localization within a thickness of only two unit cells. Our results open up a new route for creating a tunable quasi-two-dimensional electron gas in materials with strong electronic correlations.

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Section: Discussionsupporting

confidence: 88%

Section: B Charge Transfersupporting

confidence: 91%

Charge transfer in LaVO3/LaTiO3 multilayers: Strain-controlled dimensionality of interface metallicity between two Mott insulators

Beck

Ederer

2019

Phys. Rev. Materials

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“…Zero-field (ZF) muon spin relaxation measurements reveal a significant variation of the relaxation rate with temperature and, thus, the presence of spontaneous magnetic fields, breaking time-reversal symmetry in the superconducting state. Furthermore, transverse-field (TF) measurements of Lu 3 Os 4 Ge 13 provide the temperature dependence of the superconducting contribution to the relaxation rate, σ sc , which-in accordance with the previous reports [20,21]-is consistent with a multi-gap state with significantly different gap magnitude on different Fermi sheets. We find comparatively small values of ∆ i (T = 0)/k B T c for the two superconducting gaps, ∆ i , indicative of weakly coupled superconductivity in Lu 3 Os 4 Ge 13 .…”

Section: Introductionsupporting

confidence: 89%

“…Two initial studies of Lu 3 Os 4 Ge 13 by Prakash et al revealed two-gap bulk superconductivity from lowtemperature electronic specific heat measurements and a non-linear dependence of the Sommerfeld coefficient, γ n , under magnetic field [19,20]. The superfluid density measurements via tunnel diode oscillator (TDO) also confirmed the two-gap nature of the superconducting state [21]. Another noteworthy property of Lu 3 Os 4 Ge 13 is the high value of the upper critical field, H c2 , which is close to its Pauli limiting value [22], and the high transition temperature T c for a relatively low carrier density system.…”

Section: Introductionmentioning

confidence: 96%

Time-reversal symmetry breaking in superconducting low-carrier-density quasi-skutterudite Lu3Os4Ge13

Kataria¹,

Verezhak²,

Prakash³

et al. 2022

Preprint

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The complex structure of the Remeika phases, the intriguing quantum states they display, and their low carrier concentrations are a strong motivation to study the nature of their superconducting phases. In this work, the microscopic properties of the superconducting phase of single-crystalline Lu3Os4Ge13 are investigated by muon-spin relaxation and rotation (µSR) measurements. The zerofield µSR data reveal the presence of spontaneous static or quasi-static magnetic fields in the superconducting state, breaking time-reversal symmetry; the associated internal magnetic field scale is found to be exceptionally large ( 0.18 mT). Furthermore, transverse-field µSR measurements in the vortex state of Lu3Os4Ge13 imply a complex gap function with significantly different strengths on different parts of the Fermi surface. While our measurements do not completely determine the order parameter, they strongly indicate that electron-electron interactions are essential to stabilizing pairing in the system, thus, demonstrating its unconventional nature.

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“…(c) Magnetization data of the borocarbide superconductor YNi 2 B 2 C exhibiting a characteristic peak near H c2 [123]. (d) Magnetic susceptibility curves with minima associated with the PE, with the irreversibility between the heating and cooling curves shown inset [124]. (e) Peaks seen in the magneto-caloric effect of a Nb sample [110].…”

Section: Introductionmentioning

confidence: 99%

Noncentrosymmetric superconductivity and peak effect in rhenium based materials

Abud¹

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I would like to acknowledge my advisor, professor Renato F. Jardim, for giving me the opportunity to take on this PhD. His enthusiasm, continuous support, guidance and experience certainly encouraged me to pursuit the some times daunting task of conducting scientific research. I'm also grateful for the advices he gave me on various aspects of the academic life throughout the past years.I also would like to acknowledge all of the DFMT staff, specially the technical staff whose help was central not only to conduct some routinely low temperatures experiments but also to create or adapt experimental setups in the development of this project.I'm also indebted to the crystallography group of the FAP-IFUSP, specially to Társis Germano and Antônio Carlos Franco, who were always available and welcoming in the countless times that I had to run x-ray diffraction experiments.Many thanks are also due to ours collaborators at DEMAR/EEL-Lorena, specially to professor Antonio Jefferson Machado and his student Lucas Corrêa, whose help in conducting the heat treatments at high temperatures was essential to the progress of this study.I would also like to thank professor Milton Torikachvili from San Diego State University for the A.C. susceptibility and thermal conductivity measurements in several Re 3 M samples.A special thanks to professor James M. Valles Jr. for the generous hospitality at Brown University, where part of this work was conducted. I really appreciate his time and will to help during my pleasant stay in Providence, where I could learn a great deal of experimental physics while working on measurements of differential conductance in thin films.I would like to acknowledge Dr. Carlos César B. Buffon for granting me access to LNNano/CNPEM amidst pandemic times, and to Leirson Palermo and Davi Miranda for the help in operating the LNNano's PPMS Dynacool.Although this study was conducted in the last 4-5 years, it is the outcome of many more years in which I was fortunate enough to focus entirely on my education. I wish to thank all the friends and family whom, in a way or another, have made this possible. A very special thanks to Amanda, who has been supporting me and all my decisions since the beginning of this journey. My gratitude to her is ineffable.

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Nodeless superconductivity and the peak effect in the quasiskutterudites Lu3Os4Ge13 and Y3Ru<

Cited by 13 publications

References 48 publications

Charge transfer in LaVO3/LaTiO3 multilayers: Strain-controlled dimensionality of interface metallicity between two Mott insulators

Charge transfer in LaVO3/LaTiO3 multilayers: Strain-controlled dimensionality of interface metallicity between two Mott insulators

Time-reversal symmetry breaking in superconducting low-carrier-density quasi-skutterudite Lu3Os4Ge13

Noncentrosymmetric superconductivity and peak effect in rhenium based materials

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