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Title: Microscopic characterization of the magnetic properties of the itinerant antiferromagnet La 2 Ni 7 by La 139 NMR/NQR measurements

Abstract

In this study, 139La nuclear magnetic resonance (NMR) and nuclear quadrupole resonance (NQR) measurements have been performed to investigate the magnetic properties of the itinerant magnet La2Ni7, which shows a series of antiferromagnetic (AFM) phase transitions at TN1= 61 K, TN2 = 56 K, and TN3 = 42 K under zero magnetic field. Two distinct La NMR signals were observed due to the two crystallographically inequivalent La sites in La2Ni7 (La1 and La2 in the La2 Ni4 and the LaNi5 subunits of the La2Ni7 unit cell, respectively). From the 139La NQR spectrum in the AFM state below TN3, the AFM state was revealed to be a commensurate state where Ni-ordered moments align along the crystalline c axis. Owing to the two different La sites, we were able to estimate the average values of the Ni-ordered moments (0.09 – 0.10μB/ Ni and 0.17μB/ Ni around La1 and La2, respectively) from 139La NMR spectrum measurements in the AFM state below TN3, suggesting a nonuniform distribution of the Ni-ordered moments in the AFM state. In contrast, a more uniform distribution of the Ni-ordered moments in the saturated paramagnetic state induced by the application of high magnetic fields is observed. The temperature dependence ofmore » the sublattice magnetization measured by the internal magnetic induction at the La2 site in the AFM state was reproduced by a local-moment model better than the self-consistent renormalization (SCR) theory for weak itinerant antiferromagnets. Given the small Ni-ordered moments in the magnetically ordered state, our results suggest that La2Ni7 has characteristics of both itinerant nature and localized nature in its magnetism. With this in mind, it is noteworthy that the temperature dependence of nuclear spin-relaxation rates (1/T1) in the paramagnetic state above TN1 measured at zero magnetic field can be explained qualitatively by both the SCR theory and the local-moment model.« less

Authors:
ORCiD logo [1]; ORCiD logo [2];  [1]; ORCiD logo [1];  [2];  [2];  [2]; ORCiD logo [2]
  1. Ames Laboratory (AMES), Ames, IA (United States)
  2. Ames Laboratory (AMES), Ames, IA (United States); Iowa State Univ., Ames, IA (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 (MSE)
OSTI Identifier:
1994521
Report Number(s):
IS-J-11,130
Journal ID: ISSN 2469-9950; TRN: US2404973
Grant/Contract Number:  
AC02-07CH11358
Resource Type:
Accepted Manuscript
Journal Name:
Physical Review. B
Additional Journal Information:
Journal Volume: 108; Journal Issue: 6; 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; magnetic order; magnetism; antiferromagnets; strongly correlated systems; nuclear magnetic resonance; nuclear quadrupole resonance

Citation Formats

Ding, Qing -Ping, Babu, Joyal, Rana, K., Lee, Yongbin, Bud'ko, S. L., Ribeiro, R. A., Canfield, P. C., and Furukawa, Yuji. Microscopic characterization of the magnetic properties of the itinerant antiferromagnet La2Ni7 by La139 NMR/NQR measurements. United States: N. p., 2023. Web. doi:10.1103/physrevb.108.064413.
Ding, Qing -Ping, Babu, Joyal, Rana, K., Lee, Yongbin, Bud'ko, S. L., Ribeiro, R. A., Canfield, P. C., & Furukawa, Yuji. Microscopic characterization of the magnetic properties of the itinerant antiferromagnet La2Ni7 by La139 NMR/NQR measurements. United States. https://doi.org/10.1103/physrevb.108.064413
Ding, Qing -Ping, Babu, Joyal, Rana, K., Lee, Yongbin, Bud'ko, S. L., Ribeiro, R. A., Canfield, P. C., and Furukawa, Yuji. Thu . "Microscopic characterization of the magnetic properties of the itinerant antiferromagnet La2Ni7 by La139 NMR/NQR measurements". United States. https://doi.org/10.1103/physrevb.108.064413.
@article{osti_1994521,
title = {Microscopic characterization of the magnetic properties of the itinerant antiferromagnet La2Ni7 by La139 NMR/NQR measurements},
author = {Ding, Qing -Ping and Babu, Joyal and Rana, K. and Lee, Yongbin and Bud'ko, S. L. and Ribeiro, R. A. and Canfield, P. C. and Furukawa, Yuji},
abstractNote = {In this study, 139La nuclear magnetic resonance (NMR) and nuclear quadrupole resonance (NQR) measurements have been performed to investigate the magnetic properties of the itinerant magnet La2Ni7, which shows a series of antiferromagnetic (AFM) phase transitions at TN1= 61 K, TN2 = 56 K, and TN3 = 42 K under zero magnetic field. Two distinct La NMR signals were observed due to the two crystallographically inequivalent La sites in La2Ni7 (La1 and La2 in the La2 Ni4 and the LaNi5 subunits of the La2Ni7 unit cell, respectively). From the 139La NQR spectrum in the AFM state below TN3, the AFM state was revealed to be a commensurate state where Ni-ordered moments align along the crystalline c axis. Owing to the two different La sites, we were able to estimate the average values of the Ni-ordered moments (0.09 – 0.10μB/ Ni and 0.17μB/ Ni around La1 and La2, respectively) from 139La NMR spectrum measurements in the AFM state below TN3, suggesting a nonuniform distribution of the Ni-ordered moments in the AFM state. In contrast, a more uniform distribution of the Ni-ordered moments in the saturated paramagnetic state induced by the application of high magnetic fields is observed. The temperature dependence of the sublattice magnetization measured by the internal magnetic induction at the La2 site in the AFM state was reproduced by a local-moment model better than the self-consistent renormalization (SCR) theory for weak itinerant antiferromagnets. Given the small Ni-ordered moments in the magnetically ordered state, our results suggest that La2Ni7 has characteristics of both itinerant nature and localized nature in its magnetism. With this in mind, it is noteworthy that the temperature dependence of nuclear spin-relaxation rates (1/T1) in the paramagnetic state above TN1 measured at zero magnetic field can be explained qualitatively by both the SCR theory and the local-moment model.},
doi = {10.1103/physrevb.108.064413},
journal = {Physical Review. B},
number = 6,
volume = 108,
place = {United States},
year = {Thu Aug 10 00:00:00 EDT 2023},
month = {Thu Aug 10 00:00:00 EDT 2023}
}

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