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

Abstract

Here, we present inelastic neutron scattering results of phonons in (Pb 0.5Sn 0.5) 1–xIn xTe 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 T c 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 T c, there is an enhancement of these features for energies below twice the superconducting-gap energy. We further note that the superconductivity in (Pb 0.5Sn 0.5) 1–xIn xTe 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 (Pb 0.5Sn 0.5) 0.7In 0.3Te appears to be driven by phonons, a proper understanding will require ideas beyond simple BCS theor

Authors:
 [1]; ORCiD logo [2];  [3];  [1];  [1];  [1];  [4];  [4];  [1];  [1];  [1];  [1];  [5];  [2];  [1];  [1]
  1. Nanjing Univ., Nanjing (China)
  2. Brookhaven National Lab. (BNL), Upton, NY (United States)
  3. Brookhaven National Lab. (BNL), Upton, NY (United States); Stony Brook Univ., Stony Brook, NY (United States); Princeton Univ., Princeton, NJ (United States)
  4. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  5. Brookhaven National Lab. (BNL), Upton, NY (United States); National Inst. of Standards and Technology (NIST), Gaithersburg, MD (United States)
Publication Date:
Research Org.:
Brookhaven National Laboratory (BNL), Upton, NY (United States); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
OSTI Identifier:
1462866
Alternate Identifier(s):
OSTI ID: 1440352; OSTI ID: 1454370
Report Number(s):
BNL-205733-2018-JAAM
Journal ID: ISSN 2469-9950
Grant/Contract Number:  
SC0012704; 2009-BNL-PM015; AC05-00OR22725
Resource Type:
Journal Article: 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, Keijing, Tranquada, John M., Zhong, Ruidan, Chen, Tong, Gan, Yuan, Wang, Jinghui, Winn, B. L., Christianson, A. D., Li, Sinchao, Ma, Zhen, Bao, Song, Cai, Zhengwei, Xu, Guangyong, Gu, Genda, Sun, Jian, and Wen, Jinsheng. Unusual phonon density of states and response to superconducting transition in In-doped topological crystalline insulator Pb0.5Sn0.5Te. United States: N. p., 2018. Web. doi:10.1103/PhysRevB.97.220502.
Ran, Keijing, Tranquada, John M., Zhong, Ruidan, Chen, Tong, Gan, Yuan, Wang, Jinghui, Winn, B. L., Christianson, A. D., Li, Sinchao, Ma, Zhen, Bao, Song, Cai, Zhengwei, Xu, Guangyong, Gu, Genda, Sun, Jian, & Wen, Jinsheng. Unusual phonon density of states and response to superconducting transition in In-doped topological crystalline insulator Pb0.5Sn0.5Te. United States. doi:10.1103/PhysRevB.97.220502.
Ran, Keijing, Tranquada, John M., Zhong, Ruidan, Chen, Tong, Gan, Yuan, Wang, Jinghui, Winn, B. L., Christianson, A. D., Li, Sinchao, Ma, Zhen, Bao, Song, Cai, Zhengwei, Xu, Guangyong, Gu, Genda, Sun, Jian, and Wen, Jinsheng. Sat . "Unusual phonon density of states and response to superconducting transition in In-doped topological crystalline insulator Pb0.5Sn0.5Te". United States. doi:10.1103/PhysRevB.97.220502.
@article{osti_1462866,
title = {Unusual phonon density of states and response to superconducting transition in In-doped topological crystalline insulator Pb0.5Sn0.5Te},
author = {Ran, Keijing and Tranquada, John M. and Zhong, Ruidan and Chen, Tong and Gan, Yuan and Wang, Jinghui and Winn, B. L. and Christianson, A. D. and Li, Sinchao and Ma, Zhen and Bao, Song and Cai, Zhengwei and Xu, Guangyong 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 = {Sat Jun 30 00:00:00 EDT 2018},
month = {Sat Jun 30 00:00:00 EDT 2018}
}

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Works referenced in this record:

Carrier-Concentration-Dependent Phase Transition in SnTe
journal, September 1976

  • Kobayashi, K. L. I.; Kato, Y.; Katayama, Y.
  • Physical Review Letters, Vol. 37, Issue 12, p. 772-774
  • DOI: 10.1103/PhysRevLett.37.772

Topological crystalline insulators in the SnTe material class
journal, January 2012

  • Hsieh, Timothy H.; Lin, Hsin; Liu, Junwei
  • Nature Communications, Vol. 3, Article No. 982
  • DOI: 10.1038/ncomms1969

Colloquium: Topological insulators
journal, November 2010