TY - JOUR
T1 - Electron correlations and charge segregation in layered manganese pnictide antiferromagnets showing anomalously large magnetoresistance
AU - Janša, N.
AU - Huynh, K. K.
AU - Ogasawara, T.
AU - Klanjšek, M.
AU - Jeglič, P.
AU - Carretta, P.
AU - Tanigaki, Katsumi
AU - Arčon, D.
N1 - Funding Information:
This work was supported by a Grant-in-Aid for Scientific Research on Innovative Areas “J-Physics” (Grant No. 18H04304) and by JSPS KAKENHI (Grants No. 18K13489, No. 18H03883, No. 17H045326, and No. 18H03858). This research was partly made under financial support by the bilateral country research program of JSPS between AIMR, Tohoku University, and Jožef Stefan Institute, Slovenia. This work was also supported by the World Premier International Research Center Initiative (WPI), MEXT, Japan. T.O. is thankful for financial support from the International Joint Graduate Program in Materials Science (GP-MS) of Tohoku University. We acknowledge the High Field Laboratory for Superconducting Materials (HFLSM) at Tohoku University for support during the experiments at high magnetic fields. D.A. acknowledges financial support of the Slovenian Research Agency through Grants No. BI-JP/17-19-004, No. BI-JP/20-22-004, and No. J1-9145.
Publisher Copyright:
© 2021 American Physical Society.
PY - 2021/2/15
Y1 - 2021/2/15
N2 - A family of layered manganese-pnictide antiferromagnets BaMn2Pn2 (Pn stands for P, As, Sb, and Bi) has been recently shown to host anomalously large magnetoresistance (MR) with both positive and negative MR components. In search for the microscopic picture of MR in this family, we here report a local-probe Mn55 nuclear magnetic resonance (NMR) study. The zero-field NMR spectra and the temperature dependence of the spin-lattice relaxation rates are fully consistent with the proposed G-Type antiferromagnetic order. However, a close inspection of the Mn55 NMR spectra reveals a fine structure, which is due to the weakly localized charge carriers. As these carriers localize and segregate in the presence of electron correlations, they also undergo collective spin fluctuations which freeze-out at low temperatures and thus contribute to the Mn55 spin-lattice relaxation. The characteristic temperatures of the appearance of these additional features in the magnetic response probed by Mn55 NMR correlate well with the anomalies in the resistivity and anomalously large MR, which hints that the two phenomena are connected.
AB - A family of layered manganese-pnictide antiferromagnets BaMn2Pn2 (Pn stands for P, As, Sb, and Bi) has been recently shown to host anomalously large magnetoresistance (MR) with both positive and negative MR components. In search for the microscopic picture of MR in this family, we here report a local-probe Mn55 nuclear magnetic resonance (NMR) study. The zero-field NMR spectra and the temperature dependence of the spin-lattice relaxation rates are fully consistent with the proposed G-Type antiferromagnetic order. However, a close inspection of the Mn55 NMR spectra reveals a fine structure, which is due to the weakly localized charge carriers. As these carriers localize and segregate in the presence of electron correlations, they also undergo collective spin fluctuations which freeze-out at low temperatures and thus contribute to the Mn55 spin-lattice relaxation. The characteristic temperatures of the appearance of these additional features in the magnetic response probed by Mn55 NMR correlate well with the anomalies in the resistivity and anomalously large MR, which hints that the two phenomena are connected.
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U2 - 10.1103/PhysRevB.103.064422
DO - 10.1103/PhysRevB.103.064422
M3 - Article
AN - SCOPUS:85101919055
VL - 103
JO - Physical Review B
JF - Physical Review B
SN - 2469-9950
IS - 6
M1 - 064422
ER -