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

A. Gallagher; K. W. Chen; C. M. Moir; S. K. Cary; F. Kametani; N. Kikugawa; D. Graf; T. E. Albrecht-Schmitt; S. C. Riggs; A. Shekhter; R. E. Baumbach

doi:10.1038/ncomms10712

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

A. Gallagher, K. W. Chen, C. M. Moir, S. K. Cary, F. Kametani, N. Kikugawa, D. Graf, T. E. Albrecht-Schmitt, S. C. Riggs, A. Shekhter, R. E. Baumbach

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21 Scopus citations

Abstract

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 URu₂Si_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. 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.

Original language	English
Article number	10712
Journal	Nature Communications
Volume	7
DOIs	https://doi.org/10.1038/ncomms10712
State	Published - Feb 19 2016
Externally published	Yes

Funding

This work was performed at the National High Magnetic Field Laboratory (NHMFL), which is supported by National Science Foundation Cooperative agreement number DMR-1157490, the State of Florida and the DOE. A portion of this work was supported by the NHMFL User Collaboration Grant Program (UCGP). TAS and SC acknowledge support from the US Department of Energy, Office of Science, Office of Basic Energy Sciences, Heavy Elements Chemistry Program, under award number DE-FG02-13ER16414.

Funders	Funder number
Heavy Elements Chemistry Program	DE-FG02-13ER16414
Office of Basic Energy Sciences
State of Florida
US Department of Energy
National Science Foundation	DMR-1157490
U.S. Department of Energy
Directorate for Mathematical and Physical Sciences	1157490
Office of Science

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title = "Unfolding the physics of URu 2 Si 2 through silicon to phosphorus substitution",

abstract = "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. 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.",

author = "A. Gallagher and Chen, {K. W.} and Moir, {C. M.} and Cary, {S. K.} and F. Kametani and N. Kikugawa and D. Graf and Albrecht-Schmitt, {T. E.} and Riggs, {S. C.} and A. Shekhter and Baumbach, {R. E.}",

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AU - Gallagher, A.

AU - Chen, K. W.

AU - Moir, C. M.

AU - Cary, S. K.

AU - Kametani, F.

AU - Kikugawa, N.

AU - Graf, D.

AU - Albrecht-Schmitt, T. E.

AU - Riggs, S. C.

AU - Shekhter, A.

AU - Baumbach, R. E.

PY - 2016/2/19

Y1 - 2016/2/19

N2 - 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. 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.

AB - 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. 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.

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

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