Cooling a polaronic liquid:  Phase mixture and pseudogap-like spectra in superconducting Ba1−xKxBiO3

M. Naamneh; M. Yao; J. Jandke; J. Ma; Z. Ristić; J. Teyssier; A. Stucky; D. van der Marel; D. J. Gawryluk; T. Shang; M. Medarde; E. Pomjakushina; S. Li; T. Berlijn; S. Johnston; M. Müller; J. Mesot; M. Shi; M. Radović; N. C. Plumb

Cooling a polaronic liquid: Phase mixture and pseudogap-like spectra in superconducting Ba1−xKxBiO3

M. Naamneh, M. Yao, J. Jandke, J. Ma, Z. Ristić, J. Teyssier, A. Stucky, D. van der Marel, D. J. Gawryluk, T. Shang, M. Medarde, E. Pomjakushina, S. Li, T. Berlijn, S. Johnston, M. Müller, J. Mesot, M. Shi, M. Radović, N. C. Plumb

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Abstract

Many complex electronic systems exhibit so-called pseudogaps, which are poorly-understood suppression of low-energy spectral intensity in the absence of an obvious gap-inducing symmetry. Here we investigate the superconductor $Ba_{1-x}K_{x}BiO_{3}$ near optimal doping, where unconventional transport behavior and evidence of pseudogap(s) have been observed above the superconducting transition temperature $T_{c}$, and near an insulating phase with long-range lattice distortions. Angle-resolved photoemission spectroscopy (ARPES) reveals a dispersive band with vanishing quasiparticle weight and "tails" of deep-energy intensity that strongly decay approaching the Fermi level. Upon cooling below a transition temperature $T_{p} > T_{c}$, which correlates with a change in the slope of the resistivity vs. temperature, a partial transfer of spectral weight near $E_{F}$ into the deep-binding energy tails is found to result from metal-insulator phase separation. Combined with simulations and Raman scattering, our results signal that insulating islands of ordered bipolarons precipitate out of a disordered polaronic liquid and provide evidence that this process is regulated by a crossover in the electronic mean free path.

Original language	English GB
State	Published - 2018

Publication series

Name	arXiv preprint arXiv:1808.06135‏

Keywords

cond-mat.supr-con

Access to Document

1808.06135v1

Cite this

Naamneh, M., Yao, M., Jandke, J., Ma, J., Ristić, Z., Teyssier, J., Stucky, A., Marel, D. V. D., Gawryluk, D. J., Shang, T., Medarde, M., Pomjakushina, E., Li, S., Berlijn, T., Johnston, S., Müller, M., Mesot, J., Shi, M., Radović, M., & Plumb, N. C. (2018). Cooling a polaronic liquid: Phase mixture and pseudogap-like spectra in superconducting Ba1−xKxBiO3. (arXiv preprint arXiv:1808.06135‏).

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title = "Cooling a polaronic liquid: Phase mixture and pseudogap-like spectra in superconducting Ba1−xKxBiO3",

abstract = " Many complex electronic systems exhibit so-called pseudogaps, which are poorly-understood suppression of low-energy spectral intensity in the absence of an obvious gap-inducing symmetry. Here we investigate the superconductor $Ba_{1-x}K_{x}BiO_{3}$ near optimal doping, where unconventional transport behavior and evidence of pseudogap(s) have been observed above the superconducting transition temperature $T_{c}$, and near an insulating phase with long-range lattice distortions. Angle-resolved photoemission spectroscopy (ARPES) reveals a dispersive band with vanishing quasiparticle weight and {"}tails{"} of deep-energy intensity that strongly decay approaching the Fermi level. Upon cooling below a transition temperature $T_{p} > T_{c}$, which correlates with a change in the slope of the resistivity vs. temperature, a partial transfer of spectral weight near $E_{F}$ into the deep-binding energy tails is found to result from metal-insulator phase separation. Combined with simulations and Raman scattering, our results signal that insulating islands of ordered bipolarons precipitate out of a disordered polaronic liquid and provide evidence that this process is regulated by a crossover in the electronic mean free path. ",

keywords = "cond-mat.supr-con",

author = "M. Naamneh and M. Yao and J. Jandke and J. Ma and Z. Risti{\'c} and J. Teyssier and A. Stucky and Marel, {D. van der} and Gawryluk, {D. J.} and T. Shang and M. Medarde and E. Pomjakushina and S. Li and T. Berlijn and S. Johnston and M. M{\"u}ller and J. Mesot and M. Shi and M. Radovi{\'c} and Plumb, {N. C.}",

year = "2018",

language = "אנגלית",

series = "arXiv preprint arXiv:1808.06135‏",

type = "WorkingPaper",

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Naamneh, M, Yao, M, Jandke, J, Ma, J, Ristić, Z, Teyssier, J, Stucky, A, Marel, DVD, Gawryluk, DJ, Shang, T, Medarde, M, Pomjakushina, E, Li, S, Berlijn, T, Johnston, S, Müller, M, Mesot, J, Shi, M, Radović, M & Plumb, NC 2018 'Cooling a polaronic liquid: Phase mixture and pseudogap-like spectra in superconducting Ba1−xKxBiO3' arXiv preprint arXiv:1808.06135‏.

TY - UNPB

T1 - Cooling a polaronic liquid

T2 - Phase mixture and pseudogap-like spectra in superconducting Ba1−xKxBiO3

AU - Naamneh, M.

AU - Yao, M.

AU - Jandke, J.

AU - Ma, J.

AU - Ristić, Z.

AU - Teyssier, J.

AU - Stucky, A.

AU - Marel, D. van der

AU - Gawryluk, D. J.

AU - Shang, T.

AU - Medarde, M.

AU - Pomjakushina, E.

AU - Li, S.

AU - Berlijn, T.

AU - Johnston, S.

AU - Müller, M.

AU - Mesot, J.

AU - Shi, M.

AU - Radović, M.

AU - Plumb, N. C.

PY - 2018

Y1 - 2018

N2 - Many complex electronic systems exhibit so-called pseudogaps, which are poorly-understood suppression of low-energy spectral intensity in the absence of an obvious gap-inducing symmetry. Here we investigate the superconductor $Ba_{1-x}K_{x}BiO_{3}$ near optimal doping, where unconventional transport behavior and evidence of pseudogap(s) have been observed above the superconducting transition temperature $T_{c}$, and near an insulating phase with long-range lattice distortions. Angle-resolved photoemission spectroscopy (ARPES) reveals a dispersive band with vanishing quasiparticle weight and "tails" of deep-energy intensity that strongly decay approaching the Fermi level. Upon cooling below a transition temperature $T_{p} > T_{c}$, which correlates with a change in the slope of the resistivity vs. temperature, a partial transfer of spectral weight near $E_{F}$ into the deep-binding energy tails is found to result from metal-insulator phase separation. Combined with simulations and Raman scattering, our results signal that insulating islands of ordered bipolarons precipitate out of a disordered polaronic liquid and provide evidence that this process is regulated by a crossover in the electronic mean free path.

AB - Many complex electronic systems exhibit so-called pseudogaps, which are poorly-understood suppression of low-energy spectral intensity in the absence of an obvious gap-inducing symmetry. Here we investigate the superconductor $Ba_{1-x}K_{x}BiO_{3}$ near optimal doping, where unconventional transport behavior and evidence of pseudogap(s) have been observed above the superconducting transition temperature $T_{c}$, and near an insulating phase with long-range lattice distortions. Angle-resolved photoemission spectroscopy (ARPES) reveals a dispersive band with vanishing quasiparticle weight and "tails" of deep-energy intensity that strongly decay approaching the Fermi level. Upon cooling below a transition temperature $T_{p} > T_{c}$, which correlates with a change in the slope of the resistivity vs. temperature, a partial transfer of spectral weight near $E_{F}$ into the deep-binding energy tails is found to result from metal-insulator phase separation. Combined with simulations and Raman scattering, our results signal that insulating islands of ordered bipolarons precipitate out of a disordered polaronic liquid and provide evidence that this process is regulated by a crossover in the electronic mean free path.

KW - cond-mat.supr-con

M3 - גרסה מוקדמת

T3 - arXiv preprint arXiv:1808.06135‏

BT - Cooling a polaronic liquid

ER -