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Title: Competition of superconductivity with the structural transition in M o 3 S b 7

Abstract

Prior to the superconducting transition at T c ≈ 2.3 K, Mo 3Sb 7 undergoes a symmetry-lowering, cubic-to-tetragonal structural transition at T s = 53 K. In this paper, we have monitored the pressure dependence of these two transitions by measuring the resistivity of Mo 3Sb 7 single crystals under various hydrostatic pressures up to 15 GPa. The application of external pressure enhances T c but suppresses T s until P c ≈ 10 GPa, above which a pressure-induced first order structural transition takes place and is manifested by the phase coexistence in the pressure range 8 ≤ P ≤ 12 GPa. The cubic phase above 12 GPa is also found to be superconducting with a higher T c ≈ 6 K that decreases slightly with further increasing pressure. The variations with pressure of T c and T s satisfy the Bilbro-McMillan equation, i.e. T c nT s 1-n = constant, thus suggesting the competition of superconductivity with the structural transition that has been proposed to be accompanied with a spin-gap formation at T s. Finally, this scenario is supported by our first-principles calculations which imply the plausible importance of magnetism that competes with the superconductivity in Mo 3Sb 7.

Authors:
 [1];  [2];  [3];  [4];  [5];  [6];  [6];  [7];  [3];  [3];  [6]
  1. Chinese Academy of Sciences (CAS), Beijing (China). Beijing National Lab. for Condensed Matter Physics. Inst. of Physics; Yunnan Univ., Kunming (China). School of Physical Science and Astronomy
  2. Chinese Academy of Sciences (CAS), Beijing (China). Beijing National Lab. for Condensed Matter Physics. Inst. of Physics; Univ. of Tokyo, Kashiwa (Japan). Inst. for Solid State Physics
  3. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Materials Science and Technology Division
  4. Chinese Academy of Sciences (CAS), Beijing (China). Beijing National Lab. for Condensed Matter Physics. Inst. of Physics
  5. Univ. of Tokyo, Kashiwa (Japan). Inst. for Solid State Physics; Univ. of Electro-Communications, Chofu (Japan). Dept. of Engineering Science
  6. Univ. of Tokyo, Kashiwa (Japan). Inst. for Solid State Physics
  7. Yunnan Univ., Kunming (China). School of Physical Science and Astronomy
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Chinese Academy of Sciences (CAS), Beijing (China); Univ. of Tokyo, Kashiwa (Japan)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22); National Basic Research Program of China; National Science Foundation of China; Chinese Academy of Sciences; Huazhong Univ. of Science and Technology (China)
Contributing Org.:
Yunnan Univ., Kunming (China); Univ. of Electro-Communications, Chofu (Japan)
OSTI Identifier:
1338563
Alternate Identifier(s):
OSTI ID: 1335721
Grant/Contract Number:  
AC05-00OR22725; 2014CB921500; 11574377; XDB07020100; QYZDB-SSW-SLH013; 2015KF22
Resource Type:
Accepted Manuscript
Journal Name:
Physical Review B
Additional Journal Information:
Journal Volume: 94; 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

Citation Formats

Ye, G. Z., Cheng, J. -G., Yan, Jiaqiang, Sun, J. P., Matsubayashi, K., Yamauchi, T., Okada, T., Zhou, Q., Parker, David S., Sales, Brian C., and Uwatoko, Yoshiya. Competition of superconductivity with the structural transition in Mo3Sb7. United States: N. p., 2016. Web. doi:10.1103/PhysRevB.94.224508.
Ye, G. Z., Cheng, J. -G., Yan, Jiaqiang, Sun, J. P., Matsubayashi, K., Yamauchi, T., Okada, T., Zhou, Q., Parker, David S., Sales, Brian C., & Uwatoko, Yoshiya. Competition of superconductivity with the structural transition in Mo3Sb7. United States. doi:10.1103/PhysRevB.94.224508.
Ye, G. Z., Cheng, J. -G., Yan, Jiaqiang, Sun, J. P., Matsubayashi, K., Yamauchi, T., Okada, T., Zhou, Q., Parker, David S., Sales, Brian C., and Uwatoko, Yoshiya. Wed . "Competition of superconductivity with the structural transition in Mo3Sb7". United States. doi:10.1103/PhysRevB.94.224508. https://www.osti.gov/servlets/purl/1338563.
@article{osti_1338563,
title = {Competition of superconductivity with the structural transition in Mo3Sb7},
author = {Ye, G. Z. and Cheng, J. -G. and Yan, Jiaqiang and Sun, J. P. and Matsubayashi, K. and Yamauchi, T. and Okada, T. and Zhou, Q. and Parker, David S. and Sales, Brian C. and Uwatoko, Yoshiya},
abstractNote = {Prior to the superconducting transition at Tc ≈ 2.3 K, Mo3Sb7 undergoes a symmetry-lowering, cubic-to-tetragonal structural transition at Ts = 53 K. In this paper, we have monitored the pressure dependence of these two transitions by measuring the resistivity of Mo3Sb7 single crystals under various hydrostatic pressures up to 15 GPa. The application of external pressure enhances Tc but suppresses Ts until Pc ≈ 10 GPa, above which a pressure-induced first order structural transition takes place and is manifested by the phase coexistence in the pressure range 8 ≤ P ≤ 12 GPa. The cubic phase above 12 GPa is also found to be superconducting with a higher Tc ≈ 6 K that decreases slightly with further increasing pressure. The variations with pressure of Tc and Ts satisfy the Bilbro-McMillan equation, i.e. TcnTs1-n = constant, thus suggesting the competition of superconductivity with the structural transition that has been proposed to be accompanied with a spin-gap formation at Ts. Finally, this scenario is supported by our first-principles calculations which imply the plausible importance of magnetism that competes with the superconductivity in Mo3Sb7.},
doi = {10.1103/PhysRevB.94.224508},
journal = {Physical Review B},
number = 22,
volume = 94,
place = {United States},
year = {2016},
month = {12}
}

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