Dehybridization of f and d states in the heavy-fermion system YbRh2Si2

Leuenberger, D.; Sobota, J. A.; Yang, S. -L.; Pfau, H.; Kim, D. -J.; Mo, S. -K.; Fisk, Z.; Kirchmann, P. S.; Shen, Z. -X.

doi:10.1103/physrevb.97.165108

Title: Dehybridization of $f$ and $d$ states in the heavy-fermion system ${YbRh}_{2} {Si}_{2}$

Journal Article · 06 April 2018 · Physical Review B

DOI: https://doi.org/10.1103/physrevb.97.165108 · OSTI ID:1435909

Leuenberger, D. ^[1]; Sobota, J. A. ^[2]; Yang, S. -L. ^[3]; Pfau, H. ^[4]; Kim, D. -J. ^[5]; Mo, S. -K. ^[6]; Fisk, Z. ^[5]; Kirchmann, P. S. ^[7]; Shen, Z. -X. ^[8]

SLAC National Accelerator Lab., Menlo Park, CA (United States). Stanford Institute for Materials and Energy Science (SIMES); Stanford Univ., CA (United States). Geballe Lab. for Advanced Materials
SLAC National Accelerator Lab., Menlo Park, CA (United States). Stanford Institute for Materials and Energy Science (SIMES); Stanford Univ., CA (United States). Geballe Lab. for Advanced Materials; Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Advanced Light Source (ALS)
SLAC National Accelerator Lab., Menlo Park, CA (United States). Stanford Institute for Materials and Energy Science (SIMES); Stanford Univ., CA (United States). Geballe Lab. for Advanced Materials; Cornell Univ., Ithaca, NY (United States). Kavli Inst. at Cornell for Nanoscale Science, Lab. of Atomic and Solid State Physics, Dept. of Physics, and Dept. of Materials Science and Engineering
SLAC National Accelerator Lab., Menlo Park, CA (United States). Stanford Institute for Materials and Energy Science (SIMES); Stanford Univ., CA (United States). Dept. of Physics
Univ. of California, Irvine, CA (United States). Dept. of Physics and Astronomy
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Advanced Light Source (ALS)
SLAC National Accelerator Lab., Menlo Park, CA (United States). Stanford Institute for Materials and Energy Science (SIMES)
SLAC National Accelerator Lab., Menlo Park, CA (United States). Stanford Institute for Materials and Energy Science (SIMES); Stanford Univ., CA (United States). Geballe Lab. for Advanced Materials and Dept. of Physics

Here, we report an optically induced reduction of the f-d hybridization in the prototypical heavy-fermion compound YbRh₂Si₂. We use femtosecond time- and angle-resolved photoemission spectroscopy to monitor changes of spectral weight and binding energies of the Yb 4f and Rh 4d states before the lattice temperature increases after pumping. Overall, the f-d hybridization decreases smoothly with increasing electronic temperature up to ~ 250 K but changes slope at ~ 100 K. This temperature scale coincides with the onset of coherent Kondo scattering and with thermally populating the first excited crystal electrical field level. Extending previous photoemission studies, we observe a persistent f-d hybridization up to at least ~ 250 K, which is far larger than the coherence temperature defined by transport but in agreement with the temperature dependence of the noninteger Yb valence. Our data underlines the distinction of probes accessing spin and charge degrees of freedom in strongly correlated systems.

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Research Organization:: SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Advanced Light Source (ALS)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Materials Sciences & Engineering Division; Swiss National Science Foundation (SNSF); Gordon and Betty Moore Foundation; Stanford Univ., CA (United States); Cornell Univ., Ithaca, NY (United States); Alexander von Humboldt Foundation

Grant/Contract Number:: AC02-76SF00515; AC02-05CH11231

OSTI ID:: 1435909

Journal Information:: Physical Review B, Journal Name: Physical Review B Journal Issue: 16 Vol. 97; ISSN 2469-9950; ISSN PRBMDO

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Thermopower Evolution in Yb( $$\hbox {Rh}_{1-x}\hbox {Co}_x$$ Rh 1 - x Co x ) $$_2\hbox {Si}_2$$ 2 Si 2 Upon 4f Localization Stockert, U.; Klingner, C.; Krellner, C. Journal of Low Temperature Physics, Vol. 196, Issue 3-4 https://doi.org/10.1007/s10909-019-02187-6	journal	April 2019
Strong spin-orbit coupling in the noncentrosymmetric Kondo lattice Generalov, A.; Falke, J.; Nechaev, I. A. Physical Review B, Vol. 98, Issue 11 https://doi.org/10.1103/physrevb.98.115157	journal	September 2018

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Title: Dehybridization of f and d states in the heavy-fermion system YbRh 2 Si 2

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Title: Dehybridization of $f$ and $d$ states in the heavy-fermion system ${YbRh}_{2} {Si}_{2}$