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Title: Unfolding the physics of URu 2Si 2 through silicon to phosphorus substitution

The heavy fermion intermetallic compound URu 2Si 2 exhibits a hidden-order phase below the temperature of 17.5 K, which supports both anomalous metallic behavior and unconventional superconductivity. While these individual phenomena have been investigated in detail, it remains unclear how they are related to each other and to what extent uranium f-electron valence fluctuations influence each one. Here we use ligand site substituted URu 2Si 2-xP x to establish their evolution under electronic tuning. We find that while hidden order is monotonically suppressed and destroyed for x ≤ 0.035, the superconducting strength evolves non-monotonically with a maximum near x ≈ 0.01 and that superconductivity is destroyed near x ≈ 0.028. This behavior reveals that hidden order depends strongly on tuning outside of the U f-electron shells. Furthermore, it also suggests that while hidden order provides an environment for superconductivity and anomalous metallic behavior, it’s fluctuations may not be solely responsible for their progression.
Authors:
 [1] ;  [1] ;  [1] ;  [1] ;  [1] ;  [2] ;  [1] ;  [1] ;  [1] ; ORCiD logo [1] ;  [1]
  1. Florida State Univ., Tallahassee, FL (United States)
  2. Florida State Univ., Tallahassee, FL (United States); National Institute for Materials Science 3-13 Sakura, Tsukuba (Japan)
Publication Date:
Grant/Contract Number:
FG02-13ER16414; SC0010677
Type:
Accepted Manuscript
Journal Name:
Nature Communications
Additional Journal Information:
Journal Volume: 7; Journal ID: ISSN 2041-1723
Publisher:
Nature Publishing Group
Research Org:
Florida State Univ., Tallahassee, FL (United States)
Sponsoring Org:
USDOE
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
OSTI Identifier:
1395565

Gallagher, A., Chen, K. -W., Moir, C. M., Cary, S. K., Kametani, F., Kikugawa, N., Graf, D., Albrecht-Schmitt, T. E., Riggs, S. C., Shekhter, A., and Baumbach, R. E.. Unfolding the physics of URu2Si2 through silicon to phosphorus substitution. United States: N. p., Web. doi:10.1038/ncomms10712.
Gallagher, A., Chen, K. -W., Moir, C. M., Cary, S. K., Kametani, F., Kikugawa, N., Graf, D., Albrecht-Schmitt, T. E., Riggs, S. C., Shekhter, A., & Baumbach, R. E.. Unfolding the physics of URu2Si2 through silicon to phosphorus substitution. United States. doi:10.1038/ncomms10712.
Gallagher, A., Chen, K. -W., Moir, C. M., Cary, S. K., Kametani, F., Kikugawa, N., Graf, D., Albrecht-Schmitt, T. E., Riggs, S. C., Shekhter, A., and Baumbach, R. E.. 2016. "Unfolding the physics of URu2Si2 through silicon to phosphorus substitution". United States. doi:10.1038/ncomms10712. https://www.osti.gov/servlets/purl/1395565.
@article{osti_1395565,
title = {Unfolding the physics of URu2Si2 through silicon to phosphorus substitution},
author = {Gallagher, A. and Chen, K. -W. and Moir, C. M. and Cary, S. K. and Kametani, F. and Kikugawa, N. and Graf, D. and Albrecht-Schmitt, T. E. and Riggs, S. C. and Shekhter, A. and Baumbach, R. E.},
abstractNote = {The heavy fermion intermetallic compound URu2Si2 exhibits a hidden-order phase below the temperature of 17.5 K, which supports both anomalous metallic behavior and unconventional superconductivity. While these individual phenomena have been investigated in detail, it remains unclear how they are related to each other and to what extent uranium f-electron valence fluctuations influence each one. Here we use ligand site substituted URu2Si2-xPx to establish their evolution under electronic tuning. We find that while hidden order is monotonically suppressed and destroyed for x ≤ 0.035, the superconducting strength evolves non-monotonically with a maximum near x ≈ 0.01 and that superconductivity is destroyed near x ≈ 0.028. This behavior reveals that hidden order depends strongly on tuning outside of the U f-electron shells. Furthermore, it also suggests that while hidden order provides an environment for superconductivity and anomalous metallic behavior, it’s fluctuations may not be solely responsible for their progression.},
doi = {10.1038/ncomms10712},
journal = {Nature Communications},
number = ,
volume = 7,
place = {United States},
year = {2016},
month = {2}
}