Absence of Local Fluctuating Dimers in Superconducting Ir1-x(Pt,Rh)xTe2
Abstract
The compound IrTe2 is known to exhibit a transition to a modulated state featuring Ir-Ir dimers, with large associated atomic displacements. Partial substitution of Pt or Rh for Ir destabilizes the modulated structure and induces superconductivity. It has been proposed that quantum critical dimer fluctuations might be associated with the superconductivity. Here we test for such local dimer correlations and demonstrate their absence. X-ray pair distribution function approach reveals that the local structure of Ir0.95Pt0.05Te2 and Ir0.8Rh0.2Te2 dichalcogenide superconductors with compositions just past the dimer/superconductor boundary is explained well by a dimer-free model down to 10 K, ruling out the possibility of there being nanoscale dimer fluctuations in this regime. This is inconsistent with the proposed quantum-critical-point-like interplay of the dimer state and superconductivity, and precludes scenarios for dimer fluctuations mediated superconducting pairing.
- Authors:
-
[1]
- Brookhaven National Lab. (BNL), Upton, NY (United States). Condensed Matter Physics and Materials Science Dept.
- Columbia Univ., New York, NY (United States). Dept. of Applied Physics and Applied Mathematics
- Univ. of Tennessee, Knoxville, TN (United States). Dept. of Physics and Astronomy
- Brookhaven National Lab. (BNL), Upton, NY (United States). Photon Sciences Directorate
- Brookhaven National Lab. (BNL), Upton, NY (United States). Condensed Matter Physics and Materials Science Dept.; Columbia Univ., New York, NY (United States). Dept. of Physics
- Publication Date:
- Research Org.:
- Brookhaven National Lab. (BNL), Upton, NY (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Basic Energy Sciences (BES); National Science Foundation (NSF)
- OSTI Identifier:
- 1436446
- Alternate Identifier(s):
- OSTI ID: 1437682
- Report Number(s):
- BNL-203630-2018-JAAM
Journal ID: ISSN 2469-9950; TRN: US1900185
- Grant/Contract Number:
- SC0012704; SC00112704; NSF-DMR-1350002
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Physical Review B
- Additional Journal Information:
- Journal Volume: 97; Journal Issue: 17; Journal ID: ISSN 2469-9950
- Publisher:
- American Physical Society (APS)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY
Citation Formats
Yu, Runze, Banerjee, S., Lei, H. C., Sinclair, Ryan, Abeykoon, M., Zhou, H. D., Petrovic, C., Guguchia, Z., and Bozin, Emil S. Absence of Local Fluctuating Dimers in Superconducting Ir1-x(Pt,Rh)xTe2. United States: N. p., 2018.
Web. doi:10.1103/PhysRevB.97.174515.
Yu, Runze, Banerjee, S., Lei, H. C., Sinclair, Ryan, Abeykoon, M., Zhou, H. D., Petrovic, C., Guguchia, Z., & Bozin, Emil S. Absence of Local Fluctuating Dimers in Superconducting Ir1-x(Pt,Rh)xTe2. United States. doi:https://doi.org/10.1103/PhysRevB.97.174515
Yu, Runze, Banerjee, S., Lei, H. C., Sinclair, Ryan, Abeykoon, M., Zhou, H. D., Petrovic, C., Guguchia, Z., and Bozin, Emil S. Fri .
"Absence of Local Fluctuating Dimers in Superconducting Ir1-x(Pt,Rh)xTe2". United States. doi:https://doi.org/10.1103/PhysRevB.97.174515. https://www.osti.gov/servlets/purl/1436446.
@article{osti_1436446,
title = {Absence of Local Fluctuating Dimers in Superconducting Ir1-x(Pt,Rh)xTe2},
author = {Yu, Runze and Banerjee, S. and Lei, H. C. and Sinclair, Ryan and Abeykoon, M. and Zhou, H. D. and Petrovic, C. and Guguchia, Z. and Bozin, Emil S.},
abstractNote = {The compound IrTe2 is known to exhibit a transition to a modulated state featuring Ir-Ir dimers, with large associated atomic displacements. Partial substitution of Pt or Rh for Ir destabilizes the modulated structure and induces superconductivity. It has been proposed that quantum critical dimer fluctuations might be associated with the superconductivity. Here we test for such local dimer correlations and demonstrate their absence. X-ray pair distribution function approach reveals that the local structure of Ir0.95Pt0.05Te2 and Ir0.8Rh0.2Te2 dichalcogenide superconductors with compositions just past the dimer/superconductor boundary is explained well by a dimer-free model down to 10 K, ruling out the possibility of there being nanoscale dimer fluctuations in this regime. This is inconsistent with the proposed quantum-critical-point-like interplay of the dimer state and superconductivity, and precludes scenarios for dimer fluctuations mediated superconducting pairing.},
doi = {10.1103/PhysRevB.97.174515},
journal = {Physical Review B},
number = 17,
volume = 97,
place = {United States},
year = {2018},
month = {5}
}
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Figures / Tables:
FIG. 1: (Color online) Sketch of the local atomic environments in IrTe2 for the (a) undistorted high temperature structure (trigonal P$\bar{3}$m1), and (b) distorted low temperature structure (triclinic P1) featuring Ir-Ir and Te-Te dimers. Dimerization results in dramatic distortions of associated interatomic distances relative to the high temperature structure, asmore »
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