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Spin and charge density waves in quasi-one-dimensional KMn6 Bi5

Journal Article · · Physical Review. B
 [1];  [2];  [3];  [2];  [4];  [4];  [3];  [5];  [6];  [7];  [6];  [8]
  1. Argonne National Lab. (ANL), Lemont, IL (United States); Shanghai University (China)
  2. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  3. Argonne National Lab. (ANL), Lemont, IL (United States). Advanced Photon Source (APS)
  4. Shanghai University (China)
  5. Univ. of Bayreuth (Germany)
  6. Argonne National Lab. (ANL), Lemont, IL (United States)
  7. Argonne National Lab. (ANL), Lemont, IL (United States); Northwestern Univ., Evanston, IL (United States)
  8. Argonne National Lab. (ANL), Lemont, IL (United States); Northern Illinois Univ., DeKalb, IL (United States)
The recent observation that pressure could suppress antiferromagnetic (AFM) order in quasi-one-dimensional AMn6Bi5 Mn-cluster chain materials (A=Na, K, Rb, and Cs) and lead to a superconducting dome offers an alternative Mn-based class of materials with which to study unconventional superconductivity. Using neutron diffraction, we elucidate the exact nature of the previously unknown AFM ground state of KMn6Bi5 and report finding transverse incommensurate spin density waves (SDWs) for the Mn atoms with a propagating direction along the chains. The SDWs have distinct refined amplitudes of ~2.46μB for the Mn atoms in the pentagons and ~0.29μB with a large standard deviation for Mn atoms at the center between the pentagons. AFM coupling dominates both the nearest-neighbor Mn-Mn interactions within the pentagon and next-nearest-neighbor Mn-Mn interactions out of the pentagon (along the propagating wave). The SDWs exhibit both local and itinerant characteristics potentially due to cooperative interactions between local magnetic exchange and conduction electrons. Single crystal x-ray diffraction below the AFM transition revealed satellite peaks originating from charge density waves along the chain direction with a q vector twice as large as that of the SDW, pointing to a strong real space coupling between them. Additionally, we report a significant magnetoelastic effect during the AFM transition, especially along the chain direction, observed in temperature-dependent x-ray powder diffraction. Our work not only reveals fascinating intertwined spin, charge, and lattice orders in one-dimensional KMn6Bi5, but also provides an essential piece of information on its magnetic structure to understand the mechanism of superconductivity in this Mn-based family.
Research Organization:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States); Argonne National Laboratory (ANL), Argonne, IL (United States). Advanced Photon Source (APS)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division; National Natural Science Foundation of China (NSFC)
Grant/Contract Number:
AC05-00OR22725; AC02-06CH11357
OSTI ID:
1923149
Alternate ID(s):
OSTI ID: 1899644
OSTI ID: 1991301
Journal Information:
Physical Review. B, Journal Name: Physical Review. B Journal Issue: 20 Vol. 106; ISSN 2469-9950
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English

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