Surface bulk differences in a conventional superconductor, ZrB12

Thakur, Sangeeta; Biswas, Deepnarayan; Sahadev, Nishaina; Biswas⃰, Pabitra Kumar; Maiti, Kalobaran

doi:10.1063/1.4817415

Cited by 13 publications

(10 citation statements)

References 28 publications

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“…λ/d exhibits a gradual decrease with the increase in photon energy and thereby increase in the kinetic energy of photoelectrons. The minima appears between 35 eV to 40 eV kinetic energy consistent with the findings in various other systems and the universal curve [15][16][17].…”

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confidence: 90%

Depth-resolved core level spectroscopy of noncentrosymmetric solid BiPd

et al. 2020

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Understanding exotic solids is a difficult task as interactions are often hidden by the symmetry of the system. Here, we study the electronic properties of a noncentrosymmetric solid, BiPd, which is a rare material exhibiting both superconductivity and topological phase of matter. Employing high resolution photoemission spectroscopy with photon energies ranging from hard x-ray to extreme ultraviolet regime, we show that hard x-ray spectroscopy alone is not enough to reveal surface-bulk differences in the electronic structure. We derived the escape depths close to the extreme surface sensitivity and find that the photon energies used for high resolution measurements such as ARPES fall in the surface sensitive regime. In addition, we discover deviation of the branching ratio of Bi core level features derived from conventional quantum theories of the core hole final states. Such paradigm shift in core level spectroscopy can be attributed to the absence of center of symmetry and spin-orbit interactions.

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confidence: 90%

Depth-resolved core level spectroscopy of noncentrosymmetric solid BiPd

et al. 2020

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“…The feature at 44 eV binding energy is due to Ca 3s core level photoemission. The origin of the weak shoulder at about 40.4 eV binding energy can be attributed to the surface effects 15 . Fe 2p and As 3d spectra at 10 K and 300 K are almost identical indicating unchanged Madelung potential and/or effective valency of Fe and As in the whole temperature range despite the structural transition from the tetragonal to orthorhombic phase at 170 K.…”

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confidence: 99%

Complex temperature evolution of the electronic structure of CaFe2As2

Adhikary

Biswas

Sahadev

et al. 2014

Journal of Applied Physics

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We investigate the electronic structure of CaFe 2 As 2 using high resolution photoemission spectroscopy. Experimental results exhibit three energy bands crossing the Fermi level making hole pockets around the Γ-point. Temperature variation reveal a gradual shift of an energy band away from the Fermi level with the decrease in temperature in addition to the spin density wave (SDW) transition induced Fermi surface reconstruction of the second energy band across SDW transition temperature. The hole pocket in the former case eventually disappears at lower temperatures while the hole Fermi surface of the third energy band possessing finite p orbital character survives till the lowest temperature studied. These results reveal signature of a complex charge redistribution among various energy bands as a function of temperature that might be associated to the exotic properties of this system.

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“…Detailed magnetic measurements reveal signature of Meissner, mixed and intermediate states at different temperatures and magnetic fields 11 . Some of these variances were attributed to surface-bulk differences in the electronic structure 12 , the superconductivity at the sample surface 13 14 15 etc . Evidently, the properties of ZrB 12 is complex despite exhibiting signatures of BCS type superconductivity.…”

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Complex spectral evolution in a BCS superconductor, ZrB12

Thakur

Biswas

Sahadev

et al. 2013

Sci Rep

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We investigate the electronic structure of a complex conventional superconductor, ZrB12 employing high resolution photoemission spectroscopy and ab initio band structure calculations. The experimental valence band spectra could be described reasonably well within the local density approximation. Energy bands close to the Fermi level possess t2g symmetry and the Fermi level is found to be in the proximity of quantum fluctuation regime. The spectral lineshape in the high resolution spectra is complex exhibiting signature of a deviation from Fermi liquid behavior. A dip at the Fermi level emerges above the superconducting transition temperature that gradually grows with the decrease in temperature. The spectral simulation of the dip and spectral lineshape based on a phenomenological self energy suggests finite electron pair lifetime and a pseudogap above the superconducting transition temperature.

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Surface bulk differences in a conventional superconductor, ZrB12

Cited by 13 publications

References 28 publications

Depth-resolved core level spectroscopy of noncentrosymmetric solid BiPd

Depth-resolved core level spectroscopy of noncentrosymmetric solid BiPd

Complex temperature evolution of the electronic structure of CaFe2As2

Complex spectral evolution in a BCS superconductor, ZrB12

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