TY - JOUR
T1 - Magnetic behavior of T′-type Eu2CuO4 revealed by muon spin rotation and relaxation measurements
AU - Fujita, M.
AU - Suzuki, K. M.
AU - Asano, S.
AU - Okabe, H.
AU - Koda, A.
AU - Kadono, R.
AU - Watanabe, I.
N1 - Funding Information:
The <mml:mrow><mml:mi>μ</mml:mi><mml:mi>SR</mml:mi></mml:mrow></mml:math></inline-formula>measurements at the Materials and Life Science Experimental Facility of J-PARC (Proposals No. 2013A0084, No. 2014A0205, No. 2015MP001, and No. 2017B0270) and at the RIKEN-RAL Muon Facility in the Rutherford Appleton Laboratory (Proposal No. RB1670580) were performed under user programs. We thank the staff at J-PARC and RIKEN-RAL for their technical support during the experiments. We are also thankful for helpful discussions with T. Adachi, Y. Ikeda, Y. Koike, K. M. Kojima, Y. Nambu, and K. Yamada. This work was supported by JSPS KAKENHI under Grants No. 15K17689 and No. 16H02125 as well as the IMSS Multi-probe Research Grant Program.
Funding Information:
The measurements at the Materials and Life Science Experimental Facility of J-PARC (Proposals No. 2013A0084, No. 2014A0205, No. 2015MP001, and No. 2017B0270) and at the RIKEN-RAL Muon Facility in the Rutherford Appleton Laboratory (Proposal No. RB1670580) were performed under user programs. We thank the staff at J-PARC and RIKEN-RAL for their technical support during the experiments. We are also thankful for helpful discussions with T. Adachi, Y. Ikeda, Y. Koike, K. M. Kojima, Y. Nambu, and K. Yamada. This work was supported by JSPS KAKENHI under Grants No. 15K17689 and No. 16H02125 as well as the IMSS Multi-probe Research Grant Program.
Publisher Copyright:
© 2020 American Physical Society.
PY - 2020/7/15
Y1 - 2020/7/15
N2 - We performed muon-spin-rotation/-relaxation measurements to investigate the magnetic behavior of T′-type Eu2CuO4 (ECO), which is the parent compound of electron-doped cuprate superconductors, and the effects of oxygen-reduction annealing on its magnetism. In as-sintered (AS) ECO, we clarified the development of magnetic correlations upon cooling below TN1 (= 265 K) as well as the coexistence of a dominant fluctuating spin state and partially ordered spin state in the temperature range between ∼150 K and TN1. Upon further cooling, uniform long-range magnetic order was observed below TN2=110 K, which is close to the ordering temperature of 115 K in T′-type La2CuO4 (LCO) [Phys. Rev. B 82, 180508(R) (2010)PRBMDO1098-012110.1103/PhysRevB.82.180508]. For oxygen-reduction-annealed ECO, a similar ordering sequence with the same TN2 was observed but without the partially ordered spin state. Therefore, the fluctuating spin state over a wide temperature range and a TN2 less than the Néel temperature (TN2≈TN1) in T-type LCO are common features of the T′-type parent R2CuO4 (RCO, R: rare-earth ion). The origin of the partially ordered spin state in AS ECO is discussed from the viewpoint of chemical defect. Furthermore, we discuss the roles of electron doping and repairing defect in the observed effect of annealing on the magnetism of T′-type RCO.
AB - We performed muon-spin-rotation/-relaxation measurements to investigate the magnetic behavior of T′-type Eu2CuO4 (ECO), which is the parent compound of electron-doped cuprate superconductors, and the effects of oxygen-reduction annealing on its magnetism. In as-sintered (AS) ECO, we clarified the development of magnetic correlations upon cooling below TN1 (= 265 K) as well as the coexistence of a dominant fluctuating spin state and partially ordered spin state in the temperature range between ∼150 K and TN1. Upon further cooling, uniform long-range magnetic order was observed below TN2=110 K, which is close to the ordering temperature of 115 K in T′-type La2CuO4 (LCO) [Phys. Rev. B 82, 180508(R) (2010)PRBMDO1098-012110.1103/PhysRevB.82.180508]. For oxygen-reduction-annealed ECO, a similar ordering sequence with the same TN2 was observed but without the partially ordered spin state. Therefore, the fluctuating spin state over a wide temperature range and a TN2 less than the Néel temperature (TN2≈TN1) in T-type LCO are common features of the T′-type parent R2CuO4 (RCO, R: rare-earth ion). The origin of the partially ordered spin state in AS ECO is discussed from the viewpoint of chemical defect. Furthermore, we discuss the roles of electron doping and repairing defect in the observed effect of annealing on the magnetism of T′-type RCO.
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U2 - 10.1103/PhysRevB.102.045116
DO - 10.1103/PhysRevB.102.045116
M3 - Article
AN - SCOPUS:85089402971
SN - 2469-9950
VL - 102
JO - Physical Review B
JF - Physical Review B
IS - 4
M1 - 045116
ER -