Slow spin dynamics in the hyperhoneycomb lattice [(C2H5)3NH]2Cu2(C2O4)3 revealed by H1 NMR studies

Ding, Q.-P.; Dissanayake, C.; Pakhira, Santanu; Newsome, W. J.; Uribe-Romo, F.; Johnston, D. C.; Nakajima, Y.; Furukawa, Y.

doi:10.1103/physrevb.105.l100405

Slow spin dynamics in the hyperhoneycomb lattice [( C2 H5 ) 3 NH ]2 Cu2 ( C2 O4 ) 3 revealed by H 1 NMR studies

Journal Article · Thu Mar 10 00:00:00 EST 2022 · Physical Review. B

DOI:https://doi.org/10.1103/physrevb.105.l100405· OSTI ID:1864158

^[1]; Dissanayake, C. ^[2]; Pakhira, Santanu ^[1]; Newsome, W. J. ^[2]; Uribe-Romo, F. ^[2]; ^[1]; ^[2]; ^[1]

Ames Lab., Ames, IA (United States); Iowa State Univ., Ames, IA (United States)
Univ. of Central Florida, Orlando, FL (United States)

We report the results of magnetic susceptibility

χ

and

{}_{1}H

nuclear magnetic resonance (NMR) measurements on a three-dimensional hyperhoneycomb lattice compound

[(C_{2} H_{5})_{3} NH]_{2} {Cu}_{2} {(C_{2} O_{4})}_{3}

(CCCO). The average value of the antiferromagnetic (AFM) exchange coupling between the

{Cu}^{2 +}

(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 / T_{1}

at temperatures above 20 K is well explained by paramagnetic thermal spin fluctuations where the fluctuation frequency of

{Cu}^{2 +}

spins is higher than the NMR frequency of the order of megahertz. However, a clear signature of the slowing down of the

{Cu}^{2 +}

spin fluctuations was observed at low temperatures where

1 / T_{1}

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.

View Accepted Manuscript (DOE)

Research Organization:: Ames Laboratory (AMES), Ames, IA (United States)

Sponsoring Organization:: National Science Foundation (NSF); USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division

Grant/Contract Number:: AC02-07CH11358

OSTI ID:: 1864158

Report Number(s):: IS-J 10,767; DMR-1944975

Journal Information:: Physical Review. B, Journal Name: Physical Review. B Journal Issue: 10 Vol. 105; ISSN 2469-9950

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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