skip to main content

DOE PAGESDOE PAGES

Title: Robust antiferromagnetic spin waves across the metal-insulator transition in hole-doped BaMn 2 As 2

BaMn 2 As 2 is an antiferromagnetic insulator where a metal-insulator transition occurs with hole doping via the substitution of Ba with K. The metal-insulator transition causes only a small suppression of the Néel temperature (T N) and the ordered moment, suggesting that doped holes interact weakly with the Mn spin system. Powder inelastic neutron scattering measurements were performed on three different samples of Ba 1 - xK xMn 2 As 2 with x = 0 , 0.125, and 0.25 to study the effect of hole doping and metallization on the spin dynamics. We compare the neutron intensities to a linear spin-wave theory approximation to the J 1 $-$ J 2 $-$ J c Heisenberg model. Hole doping is found to introduce only minor modifications to the exchange energies and spin gap. Lastly, the changes observed in the exchange constants are consistent with the small drop of T N with doping.
Authors:
 [1] ;  [2] ;  [2] ;  [2] ; ORCiD logo [3] ; ORCiD logo [3] ; ORCiD logo [3] ;  [2] ;  [2] ;  [2] ;  [2]
  1. Istanbul Technical Univ., Maslak, Istanbul (Turkey). Dept. of Physics Engineering; Scientific and Technological Research Council of Turkey (Tubitak), Ankara (Turkey)
  2. Ames Lab. and Iowa State Univ., Ames, IA (United States). Dept. of Physics and Astronomy
  3. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Quantum Condensed Matter Division
Publication Date:
Report Number(s):
IS-J-9353
Journal ID: ISSN 2469-9950; PRBMDO; TRN: US1702751
Grant/Contract Number:
AC02-07CH11358; AC05-00OR22725
Type:
Accepted Manuscript
Journal Name:
Physical Review B
Additional Journal Information:
Journal Volume: 95; Journal Issue: 22; Journal ID: ISSN 2469-9950
Publisher:
American Physical Society (APS)
Research Org:
Ames Laboratory (AMES), Ames, IA (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)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY
OSTI Identifier:
1368057
Alternate Identifier(s):
OSTI ID: 1361115; OSTI ID: 1412047