Title: Dynamically preferred state with strong electronic fluctuations from electrochemical synthesis of sodium manganate

Journal Article · · Matter (Online)
 [1];  [1];  [2]; ORCiD logo [3]; ORCiD logo [4];  [1];  [5]; ORCiD logo [6];  [2]; ORCiD logo [3];  [1]
  1. Harvard Univ., Cambridge, MA (United States)
  2. Boston College, Chestnut Hill, MA (United States)
  3. National Inst. of Standards and Technology (NIST), Gaithersburg, MD (United States). Center for Neutron Research
  4. Argonne National Lab. (ANL), Argonne, IL (United States). Advanced Photon Source (APS)
  5. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Neutron Scattering Division
  6. Brookhaven National Lab. (BNL), Upton, NY (United States). Chemistry Div.

Electrochemical (de)intercalation is a delicate method to precisely control the alkaline ion composition in alkaline transition metal oxides. Because of complicated interactions, metal charge ordering patterns can form spontaneously at special fractional alkaline compositions and orderings. In this study, we show that this elegant electrochemical process can create dynamically preferred structures in an anharmonic energy landscape that conventional syntheses and computations can rarely visit. Specifically, electrochemically prepared Na1/2MnO2 ordering exhibits abnormal structure distortions, charge orderings, and dynamical activities. Strong magnetic fluctuations and lattice dynamics are observed in an unusually wide temperature range in Na1/2MnO2, which distinguishes it from all other NaxMnO2 at higher or lower Na compositions. The results emphasize the unique opportunity of using electrochemical processes to design and create novel quantum states with strongly coupled and mutually enhanced electronic and lattice fluctuations, likely through a special dynamic charge flux functional, as suggested by our computational investigations.

Research Organization:
Argonne National Laboratory (ANL), Argonne, IL (United States); Brookhaven National Laboratory (BNL), Upton, NY (United States)
Sponsoring Organization:
Harvard University; National Science Foundation (NSF); USDOE Office of Energy Efficiency and Renewable Energy (EERE), Transportation Office. Vehicle Technologies Office; USDOE Office of Science (SC), Basic Energy Sciences (BES); USDOE Office of Science - Office of Basic Energy Sciences
Grant/Contract Number:
AC02-06CH11357; SC0012704; SC0018675
OSTI ID:
1839216
Report Number(s):
BNL-222586-2022-JAAM
Journal Information:
Matter (Online), Journal Name: Matter (Online) Journal Issue: 2 Vol. 5; ISSN 2590-2385
Publisher:
Cell Press/ElsevierCopyright Statement
Country of Publication:
United States
Language:
English

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