Slow spin dynamics in the hyperhoneycomb lattice [ ( C 2 H 5 ) 3 NH ] 2 Cu 2 ( C 2 O 4 ) 3 revealed by H 1 NMR studies
Abstract
We report the results of magnetic susceptibility and nuclear magnetic resonance (NMR) measurements on a three-dimensional hyperhoneycomb lattice compound (CCCO). The average value of the antiferromagnetic (AFM) exchange coupling between the spins was determined to be K from the measurements. No long-range magnetic ordering has been observed down to mK, although NMR lines become slightly broader at low temperatures below 1 K. The broadening of the NMR spectrum observed below 1 K reveals that the Cu spin moments remain at this temperature, suggesting a non-spin-singlet ground state. The temperature and magnetic field dependence of at temperatures above 20 K is well explained by paramagnetic thermal spin fluctuations where the fluctuation frequency of spins is higher than the NMR frequency of the order of megahertz. However, a clear signature of the slowing down of the spin fluctuations was observed at low temperatures where shows a thermally activated behavior. The magnetic field dependence of the magnitude of the spin excitation gap suggests that the magnetic behaviors of CCCO are characterized as an AFM chain at low temperatures.
- Authors:
-
- Ames Lab., Ames, IA (United States); Iowa State Univ., Ames, IA (United States)
- Univ. of Central Florida, Orlando, FL (United States)
- Publication Date:
- Research Org.:
- Ames Laboratory (AMES), Ames, IA (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division; National Science Foundation (NSF)
- OSTI Identifier:
- 1864158
- Report Number(s):
- IS-J 10,767
Journal ID: ISSN 2469-9950; DMR-1944975; TRN: US2305685
- Grant/Contract Number:
- AC02-07CH11358; DMR-1944975
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Physical Review. B
- Additional Journal Information:
- Journal Volume: 105; Journal Issue: 10; 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; frustrated magnetism; quantum spin liquid; spin dynamics; 1-dimensional systems; 3-dimensional systems; nuclear magnetic resonance
Citation Formats
Ding, Q.-P., Dissanayake, C., Pakhira, Santanu, Newsome, W. J., Uribe-Romo, F., Johnston, D. C., Nakajima, Y., and Furukawa, Y. Slow spin dynamics in the hyperhoneycomb lattice [(C2H5)3NH]2Cu2(C2O4)3 revealed by H1 NMR studies. United States: N. p., 2022.
Web. doi:10.1103/physrevb.105.l100405.
Ding, Q.-P., Dissanayake, C., Pakhira, Santanu, Newsome, W. J., Uribe-Romo, F., Johnston, D. C., Nakajima, Y., & Furukawa, Y. Slow spin dynamics in the hyperhoneycomb lattice [(C2H5)3NH]2Cu2(C2O4)3 revealed by H1 NMR studies. United States. https://doi.org/10.1103/physrevb.105.l100405
Ding, Q.-P., Dissanayake, C., Pakhira, Santanu, Newsome, W. J., Uribe-Romo, F., Johnston, D. C., Nakajima, Y., and Furukawa, Y. Thu .
"Slow spin dynamics in the hyperhoneycomb lattice [(C2H5)3NH]2Cu2(C2O4)3 revealed by H1 NMR studies". United States. https://doi.org/10.1103/physrevb.105.l100405. https://www.osti.gov/servlets/purl/1864158.
@article{osti_1864158,
title = {Slow spin dynamics in the hyperhoneycomb lattice [(C2H5)3NH]2Cu2(C2O4)3 revealed by H1 NMR studies},
author = {Ding, Q.-P. and Dissanayake, C. and Pakhira, Santanu and Newsome, W. J. and Uribe-Romo, F. and Johnston, D. C. and Nakajima, Y. and Furukawa, Y.},
abstractNote = {We report the results of magnetic susceptibility χ and H1 nuclear magnetic resonance (NMR) measurements on a three-dimensional hyperhoneycomb lattice compound [(C2H5)3NH]2Cu2(C2O4)3 (CCCO). The average value of the antiferromagnetic (AFM) exchange coupling between the Cu2+ (S=1/2) spins was determined to be J~50 K from the χ measurements. No long-range magnetic ordering has been observed down to T=50 mK, although NMR lines become slightly broader at low temperatures below 1 K. The broadening of the NMR spectrum observed below 1 K reveals that the Cu spin moments remain at this temperature, suggesting a non-spin-singlet ground state. The temperature and magnetic field dependence of 1/T1 at temperatures above 20 K is well explained by paramagnetic thermal spin fluctuations where the fluctuation frequency of Cu2+ spins is higher than the NMR frequency of the order of megahertz. However, a clear signature of the slowing down of the Cu2+ spin fluctuations was observed at low temperatures where 1/T1 shows a thermally activated behavior. The magnetic field dependence of the magnitude of the spin excitation gap suggests that the magnetic behaviors of CCCO are characterized as an AFM chain at low temperatures.},
doi = {10.1103/physrevb.105.l100405},
journal = {Physical Review. B},
number = 10,
volume = 105,
place = {United States},
year = {Thu Mar 10 00:00:00 EST 2022},
month = {Thu Mar 10 00:00:00 EST 2022}
}
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