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

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:
Grant/Contract Number:
AC05-00OR22725; 2014CB921500; 11574377; XDB07020100; QYZDB-SSW-SLH013; 2015KF22
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)
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 Orgs:
Yunnan Univ., Kunming (China); Univ. of Electro-Communications, Chofu (Japan)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY
OSTI Identifier:
1338563
Alternate Identifier(s):
OSTI ID: 1335721