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Title: Unusual phonon density of states and response to the superconducting transition in the In-doped topological crystalline insulator Pb 0.5 Sn 0.5 Te

Abstract

Here, we present inelastic neutron scattering results of phonons in (Pb0.5Sn0.5)1–xInxTe powders, with x = 0, and 0.3.The x = 0 sample is a topological crystalline insulator, and the x = 0 . 3 sample is a superconductor with a bulk superconducting transition temperature Tc of 4.7 K. In both samples, we observe unexpected van Hove singularities in the phonon density of states at energies of 1– 2.5 meV, suggestive of local modes. On cooling the superconducting sample through Tc, there is an enhancement of these features for energies below twice the superconducting-gap energy. We further note that the superconductivity in (Pb0.5Sn0.5)1–xInxTe occurs in samples with normal-state resistivities of order 10 mΩ cm, indicative of bad-metal behavior. Calculations based on density functional theory suggest that the superconductivity is easily explainable in terms of electron-phonon coupling; however, they completely miss the low-frequency modes and do not explain the large resistivity. While the bulk superconducting state of (Pb0.5Sn0.5)0.7In0.3Te appears to be driven by phonons, a proper understanding will require ideas beyond simple BCS theor

Authors:
 [1];  [2];  [1];  [1];  [1]; ORCiD logo [3]; ORCiD logo [3];  [1];  [1];  [1];  [1];  [4];  [4];  [4];  [5];  [5]
  1. Nanjing Univ. (China). National Lab. of Solid State Microstructures and Dept. of Physics
  2. Brookhaven National Lab. (BNL), Upton, NY (United States). Condensed Matter Physics and Materials Science Dept.; Stony Brook Univ., NY (United States). Materials Science and Engineering Dept.
  3. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Neutron Scattering Division
  4. Brookhaven National Lab. (BNL), Upton, NY (United States). Condensed Matter Physics and Materials Science Dept.
  5. Nanjing Univ. (China). National Lab. of Solid State Microstructures and Dept. of Physics; Nanjing Univ. (China). Collaborative Innovation Center of Advanced Microstructures
Publication Date:
Research Org.:
Energy Frontier Research Centers (EFRC) (United States). Center for Emergent Superconductivity (CES); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Brookhaven National Lab. (BNL), Upton, NY (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
OSTI Identifier:
1462866
Alternate Identifier(s):
OSTI ID: 1440352; OSTI ID: 1454370
Report Number(s):
BNL-205733-2018-JAAM
Journal ID: ISSN 2469-9950; PRBMDO; TRN: US1902221
Grant/Contract Number:  
AC05-00OR22725; SC0012704; 2009-BNL-PM015
Resource Type:
Accepted Manuscript
Journal Name:
Physical Review B
Additional Journal Information:
Journal Volume: 97; Journal Issue: 22; 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; Electron-phonon coupling; Superconductivity; Density functional theory; First-principles calculations; Inelastic neutron scattering

Citation Formats

Ran, Kejing, Zhong, Ruidan, Chen, Tong, Gan, Yuan, Wang, Jinghui, Winn, Barry L., Christianson, Andrew D., Li, Shichao, Ma, Zhen, Bao, Song, Cai, Zhengwei, Xu, Guangyong, Tranquada, J. M., Gu, Genda, Sun, Jian, and Wen, Jinsheng. Unusual phonon density of states and response to the superconducting transition in the In-doped topological crystalline insulator Pb0.5Sn0.5Te. United States: N. p., 2018. Web. https://doi.org/10.1103/PhysRevB.97.220502.
Ran, Kejing, Zhong, Ruidan, Chen, Tong, Gan, Yuan, Wang, Jinghui, Winn, Barry L., Christianson, Andrew D., Li, Shichao, Ma, Zhen, Bao, Song, Cai, Zhengwei, Xu, Guangyong, Tranquada, J. M., Gu, Genda, Sun, Jian, & Wen, Jinsheng. Unusual phonon density of states and response to the superconducting transition in the In-doped topological crystalline insulator Pb0.5Sn0.5Te. United States. https://doi.org/10.1103/PhysRevB.97.220502
Ran, Kejing, Zhong, Ruidan, Chen, Tong, Gan, Yuan, Wang, Jinghui, Winn, Barry L., Christianson, Andrew D., Li, Shichao, Ma, Zhen, Bao, Song, Cai, Zhengwei, Xu, Guangyong, Tranquada, J. M., Gu, Genda, Sun, Jian, and Wen, Jinsheng. Fri . "Unusual phonon density of states and response to the superconducting transition in the In-doped topological crystalline insulator Pb0.5Sn0.5Te". United States. https://doi.org/10.1103/PhysRevB.97.220502. https://www.osti.gov/servlets/purl/1462866.
@article{osti_1462866,
title = {Unusual phonon density of states and response to the superconducting transition in the In-doped topological crystalline insulator Pb0.5Sn0.5Te},
author = {Ran, Kejing and Zhong, Ruidan and Chen, Tong and Gan, Yuan and Wang, Jinghui and Winn, Barry L. and Christianson, Andrew D. and Li, Shichao and Ma, Zhen and Bao, Song and Cai, Zhengwei and Xu, Guangyong and Tranquada, J. M. and Gu, Genda and Sun, Jian and Wen, Jinsheng},
abstractNote = {Here, we present inelastic neutron scattering results of phonons in (Pb0.5Sn0.5)1–xInxTe powders, with x = 0, and 0.3.The x = 0 sample is a topological crystalline insulator, and the x = 0 . 3 sample is a superconductor with a bulk superconducting transition temperature Tc of 4.7 K. In both samples, we observe unexpected van Hove singularities in the phonon density of states at energies of 1– 2.5 meV, suggestive of local modes. On cooling the superconducting sample through Tc, there is an enhancement of these features for energies below twice the superconducting-gap energy. We further note that the superconductivity in (Pb0.5Sn0.5)1–xInxTe occurs in samples with normal-state resistivities of order 10 mΩ cm, indicative of bad-metal behavior. Calculations based on density functional theory suggest that the superconductivity is easily explainable in terms of electron-phonon coupling; however, they completely miss the low-frequency modes and do not explain the large resistivity. While the bulk superconducting state of (Pb0.5Sn0.5)0.7In0.3Te appears to be driven by phonons, a proper understanding will require ideas beyond simple BCS theor},
doi = {10.1103/PhysRevB.97.220502},
journal = {Physical Review B},
number = 22,
volume = 97,
place = {United States},
year = {2018},
month = {6}
}

Journal Article:

Figures / Tables:

FIG. 1 FIG. 1: (a) Schematic for the crystal structure of Pb0.5Sn0.5Te. (b) X-ray powder diffraction results for (Pb0.5Sn0.5)1−xInxTe with x = 0 and 0.3 measured at room temperature. (c) Temperature dependence of the magnetization (left axis) and resistivity (right axis) for (Pb0.5Sn0.5)0.7In0.3Te single crystals. The magnetizations were measured in zero-field-cooling conditionsmore » with a magnetic field of 10 Oe.« less

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      Figures/Tables have been extracted from DOE-funded journal article accepted manuscripts.