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Title: Phase separation at the dimer-superconductor transition in Ir 1-xRh xTe 2

Abstract

The detailed evolution of the local atomic structure across the (x, T) phase diagram of transition metal dichalcogenide superconductor Ir 1–xRh xTe 2 (0≤x≤0.3, 10 K≤T≤300 K) is obtained from high quality x-ray diffraction data using the atomic pair distribution function (PDF) method. Observed hysteretic thermal structural phase transition from trigonal (P3¯m1) to triclinic (P1¯) dimer phase for low Rh content emphasizes intimate connection between the lattice and electronic properties. For superconducting samples away from the dimer/superconductor phase boundary structural transition is absent and the local structure remains trigonal down to 10 K. In the narrow range of compositions close to the boundary PDF analysis reveals structural phase separation, suggestive of weak first order character of the Rh-doping induced dimer-superconductor quantum phase transition. Samples from this narrow range show weak anomalies in electronic transport and magnetization, hallmarks of the dimer phase, as well as superconductivity albeit with incomplete diamagnetic screening. Furthermore, results suggest that the dimer and superconducting orders exist in the mutually exclusive spatial regions

Authors:
 [1]; ORCiD logo [2];  [3];  [4];  [2];  [2];  [5]
  1. Brookhaven National Lab. (BNL), Upton, NY (United States); Chinese Academy of Science, Beijing (People's Republic of China)
  2. Brookhaven National Lab. (BNL), Upton, NY (United States)
  3. Columbia Univ., New York, NY (United States)
  4. Brookhaven National Lab. (BNL), Upton, NY (United States); Renmin Univ., Beijing (People's Republic of China)
  5. Brookhaven National Lab. (BNL), Upton, NY (United States); Columbia Univ., New York, NY (United States)
Publication Date:
Research Org.:
Brookhaven National Lab. (BNL), Upton, NY (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
OSTI Identifier:
1477484
Alternate Identifier(s):
OSTI ID: 1478553
Report Number(s):
BNL-209163-2018-JAAM
Journal ID: ISSN 2469-9950
Grant/Contract Number:  
SC0012704
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Physical Review B
Additional Journal Information:
Journal Volume: 98; Journal Issue: 13; 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, Bozin, Emil S., Banerjee, S., Lei, H., Abeykoon, M., Petrovic, C., and Guguchia, Z. Phase separation at the dimer-superconductor transition in Ir1-xRhxTe2. United States: N. p., 2018. Web. doi:10.1103/PhysRevB.98.134506.
Yu, Runze, Bozin, Emil S., Banerjee, S., Lei, H., Abeykoon, M., Petrovic, C., & Guguchia, Z. Phase separation at the dimer-superconductor transition in Ir1-xRhxTe2. United States. doi:10.1103/PhysRevB.98.134506.
Yu, Runze, Bozin, Emil S., Banerjee, S., Lei, H., Abeykoon, M., Petrovic, C., and Guguchia, Z. Tue . "Phase separation at the dimer-superconductor transition in Ir1-xRhxTe2". United States. doi:10.1103/PhysRevB.98.134506. https://www.osti.gov/servlets/purl/1477484.
@article{osti_1477484,
title = {Phase separation at the dimer-superconductor transition in Ir1-xRhxTe2},
author = {Yu, Runze and Bozin, Emil S. and Banerjee, S. and Lei, H. and Abeykoon, M. and Petrovic, C. and Guguchia, Z.},
abstractNote = {The detailed evolution of the local atomic structure across the (x, T) phase diagram of transition metal dichalcogenide superconductor Ir1–xRhxTe2 (0≤x≤0.3, 10 K≤T≤300 K) is obtained from high quality x-ray diffraction data using the atomic pair distribution function (PDF) method. Observed hysteretic thermal structural phase transition from trigonal (P3¯m1) to triclinic (P1¯) dimer phase for low Rh content emphasizes intimate connection between the lattice and electronic properties. For superconducting samples away from the dimer/superconductor phase boundary structural transition is absent and the local structure remains trigonal down to 10 K. In the narrow range of compositions close to the boundary PDF analysis reveals structural phase separation, suggestive of weak first order character of the Rh-doping induced dimer-superconductor quantum phase transition. Samples from this narrow range show weak anomalies in electronic transport and magnetization, hallmarks of the dimer phase, as well as superconductivity albeit with incomplete diamagnetic screening. Furthermore, results suggest that the dimer and superconducting orders exist in the mutually exclusive spatial regions},
doi = {10.1103/PhysRevB.98.134506},
journal = {Physical Review B},
issn = {2469-9950},
number = 13,
volume = 98,
place = {United States},
year = {2018},
month = {10}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record

Figures / Tables:

FIG. 1 FIG. 1: Details of IrTe2 structures. (a) Undistorted high temperature trigonal model (s. g. P$\bar{3}$m1). (b) distorted low temperature triclinic model (s. g. P$\bar{1}$) featuring Ir dimers. (c) Sketch of local IrTe6 octahedral environments expected in the absence/presence of Ir dimers (top/bottom). Dimerization results in dramatic distortions of associated interatomicmore » distances relative to the high temperature structure: Ir-Ir and Te-Te dimer distances reduce by 0.83 Å and 0.5 Å respectively, while lateral Te-Te distance elongates by 0.29 Å, as indicated by block arrows.« less

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