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Title: Interplay between unconventional superconductivity and heavy-fermion quantum criticality: CeCu 2Si 2 versus YbRh 2Si 2

Abstract

In this paper the low-temperature properties of two isostructural canonical heavy-fermion compounds are contrasted with regards to the interplay between antiferromagnetic (AF) quantum criticality and superconductivity. For CeCu 2Si 2, fully-gapped d-wave superconductivity forms in the vicinity of an itinerant three-dimensional heavy-fermion spin-density-wave (SDW) quantum critical point (QCP). Inelastic neutron scattering results highlight that both quantum critical SDW fluctuations as well as Mott-type fluctuations of local magnetic moments contribute to the formation of Cooper pairs in CeCu 2Si 2. In YbRh 2Si 2, superconductivity appears to be suppressed at T ≳10 mK by AF order ( T N = 70 mK). Ultra-low temperature measurements reveal a hybrid order between nuclear and 4f-electronic spins, which is dominated by the Yb-derived nuclear spins, to develop at T A slightly above 2 mK. The hybrid order turns out to strongly compete with the primary 4f-electronic order and to push the material towards its QCP. Apparently, this paves the way for heavy-fermion superconductivity to form at T c = 2 mK. Like the pressure – induced QCP in CeRhIn 5, the magnetic field – induced one in YbRh 2Si 2 is of the local Kondo-destroying variety which corresponds to a Mott-type transition at zeromore » temperature. Therefore, these materials form the link between the large family of about fifty low- T unconventional heavy – fermion superconductors and other families of unconventional superconductors with higher T cs, notably the doped Mott insulators of the cuprates, organic charge-transfer salts and some of the Fe-based superconductors. As a result, our study suggests that heavy-fermion superconductivity near an AF QCP is a robust phenomenon.« less

Authors:
 [1];  [2];  [2];  [1];  [3];  [1];  [2];  [4];  [4];  [5];  [6];  [7];  [8];  [9];  [2];  [2];  [2];  [10];  [2];  [11] more »;  [12];  [2];  [13];  [14];  [15];  [16];  [17];  [18] « less
  1. Zhejiang Univ., Hangzhou (People's Republic of China)
  2. Max Planck Institute for Chemical Physics of Solids, Dresden (Germany)
  3. Zhejiang Univ., Hangzhou (People's Republic of China); Max Planck Institute for Chemical Physics of Solids, Dresden (Germany)
  4. Kyoto Univ., Kyoto (Japan)
  5. Shimane Univ., Matsue (Japan)
  6. Okayama Univ., Okayama (Japan)
  7. Bavarian Academy of Sciences, Garching (Germany); Max Planck Institute for Chemical Physics of Solids, Dresden (Germany)
  8. Bavarian Academy of Sciences, Garching (Germany)
  9. Texas A & M Univ., College Station, TX (United States); Bavarian Academy of Sciences, Garching (Germany); Max Planck Institute for Chemical Physics of Solids, Dresden (Germany)
  10. SLAC National Accelerator Lab., Menlo Park, CA (United States); Max Planck Institute for Chemical Physics of Solids, Dresden (Germany)
  11. Chinese Academy of Sciences (CAS), Beijing (China); Max Planck Institute for Chemical Physics of Solids, Dresden (Germany)
  12. Univ. of Bristol, Bristol (United Kingdom); Max Planck Institute for Chemical Physics of Solids, Dresden (Germany)
  13. Univ. of Frankfurt, Frankfurt (Germany); Max Planck Institute for Chemical Physics of Solids, Dresden (Germany)
  14. Zhejiang Univ., Hangzhou (People’s Republic of China)
  15. Univ. of British Columbia, Vancouver, BC (Canada); Rice Univ., Houston, TX (United States)
  16. Renmin Univ. of China, Beijing (China); Rice Univ., Houston, TX (United States)
  17. Rice Univ., Houston, TX (United States)
  18. Max Planck Institute for Chemical Physics of Solids, Dresden (Germany); Zhejiang Univ., Hangzhou (People's Republic of China); Chinese Academy of Sciences, Beijing (People's Republic of China)
Publication Date:
Research Org.:
SLAC National Accelerator Lab., Menlo Park, CA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1481215
Grant/Contract Number:  
AC02-76SF00515; 2016YFA0300202; 2017YFA0303100; 11474251; U1632275; TZ2016004; DMR-1611392; C-1411
Resource Type:
Accepted Manuscript
Journal Name:
Philosophical Magazine (2003, Print)
Additional Journal Information:
Journal Name: Philosophical Magazine (2003, Print); Journal Volume: 98; Journal Issue: 32; Journal ID: ISSN 1478-6435
Publisher:
Taylor & Francis
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; heavy-fermion metals; superconductivity; quantum critical phenomena

Citation Formats

Smidman, M., Stockert, O., Arndt, J., Pang, G. M., Jiao, L., Yuan, H. Q., Vieyra, H. A., Kitagawa, S., Ishida, K., Fujiwara, K., Kobayashi, T. C., Schuberth, E., Tippmann, M., Steinke, L., Lausberg, S., Steppke, A., Brando, M., Pfau, H., Stockert, U., Sun, P., Friedemann, S., Wirth, S., Krellner, C., Kirchner, S., Nica, E. M., Yu, R., Si, Q., and Steglich, Frank. Interplay between unconventional superconductivity and heavy-fermion quantum criticality: CeCu2Si2 versus YbRh2Si2. United States: N. p., 2018. Web. doi:10.1080/14786435.2018.1511070.
Smidman, M., Stockert, O., Arndt, J., Pang, G. M., Jiao, L., Yuan, H. Q., Vieyra, H. A., Kitagawa, S., Ishida, K., Fujiwara, K., Kobayashi, T. C., Schuberth, E., Tippmann, M., Steinke, L., Lausberg, S., Steppke, A., Brando, M., Pfau, H., Stockert, U., Sun, P., Friedemann, S., Wirth, S., Krellner, C., Kirchner, S., Nica, E. M., Yu, R., Si, Q., & Steglich, Frank. Interplay between unconventional superconductivity and heavy-fermion quantum criticality: CeCu2Si2 versus YbRh2Si2. United States. doi:10.1080/14786435.2018.1511070.
Smidman, M., Stockert, O., Arndt, J., Pang, G. M., Jiao, L., Yuan, H. Q., Vieyra, H. A., Kitagawa, S., Ishida, K., Fujiwara, K., Kobayashi, T. C., Schuberth, E., Tippmann, M., Steinke, L., Lausberg, S., Steppke, A., Brando, M., Pfau, H., Stockert, U., Sun, P., Friedemann, S., Wirth, S., Krellner, C., Kirchner, S., Nica, E. M., Yu, R., Si, Q., and Steglich, Frank. Mon . "Interplay between unconventional superconductivity and heavy-fermion quantum criticality: CeCu2Si2 versus YbRh2Si2". United States. doi:10.1080/14786435.2018.1511070. https://www.osti.gov/servlets/purl/1481215.
@article{osti_1481215,
title = {Interplay between unconventional superconductivity and heavy-fermion quantum criticality: CeCu2Si2 versus YbRh2Si2},
author = {Smidman, M. and Stockert, O. and Arndt, J. and Pang, G. M. and Jiao, L. and Yuan, H. Q. and Vieyra, H. A. and Kitagawa, S. and Ishida, K. and Fujiwara, K. and Kobayashi, T. C. and Schuberth, E. and Tippmann, M. and Steinke, L. and Lausberg, S. and Steppke, A. and Brando, M. and Pfau, H. and Stockert, U. and Sun, P. and Friedemann, S. and Wirth, S. and Krellner, C. and Kirchner, S. and Nica, E. M. and Yu, R. and Si, Q. and Steglich, Frank},
abstractNote = {In this paper the low-temperature properties of two isostructural canonical heavy-fermion compounds are contrasted with regards to the interplay between antiferromagnetic (AF) quantum criticality and superconductivity. For CeCu2Si2, fully-gapped d-wave superconductivity forms in the vicinity of an itinerant three-dimensional heavy-fermion spin-density-wave (SDW) quantum critical point (QCP). Inelastic neutron scattering results highlight that both quantum critical SDW fluctuations as well as Mott-type fluctuations of local magnetic moments contribute to the formation of Cooper pairs in CeCu2Si2. In YbRh2Si2, superconductivity appears to be suppressed at T ≳10 mK by AF order (TN = 70 mK). Ultra-low temperature measurements reveal a hybrid order between nuclear and 4f-electronic spins, which is dominated by the Yb-derived nuclear spins, to develop at TA slightly above 2 mK. The hybrid order turns out to strongly compete with the primary 4f-electronic order and to push the material towards its QCP. Apparently, this paves the way for heavy-fermion superconductivity to form at Tc = 2 mK. Like the pressure – induced QCP in CeRhIn5, the magnetic field – induced one in YbRh2Si2 is of the local Kondo-destroying variety which corresponds to a Mott-type transition at zero temperature. Therefore, these materials form the link between the large family of about fifty low-T unconventional heavy – fermion superconductors and other families of unconventional superconductors with higher Tcs, notably the doped Mott insulators of the cuprates, organic charge-transfer salts and some of the Fe-based superconductors. As a result, our study suggests that heavy-fermion superconductivity near an AF QCP is a robust phenomenon.},
doi = {10.1080/14786435.2018.1511070},
journal = {Philosophical Magazine (2003, Print)},
number = 32,
volume = 98,
place = {United States},
year = {2018},
month = {8}
}

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