TY - JOUR
T1 - Large thermal conductivity due to spins in the two-dimensional spin system LaSrFeO4
AU - Komatsu, Eiki
AU - Kawamata, Takayuki
AU - Kato, Masatsune
AU - Sasaki, Takahiko
AU - Koike, Yoji
N1 - Funding Information:
The thermal conductivity measurements in magnetic fields were performed at the High Field Laboratory for Superconducting Materials, Institute for Materials Research, Tohoku University. This work was supported by JSPS KAKENHI Grant Number 16K06716. Figure 1 was drawn using VESTA.33)
Funding Information:
Acknowledgments The thermal conductivity measurements in magnetic fields were performed at the High Field Laboratory for Superconducting Materials, Institute for Materials Research, Tohoku University. This work was supported by JSPS KAKENHI Grant Number 16K06716. Figure 1 was drawn using VESTA.33)
Publisher Copyright:
© 2020 Physical Society of Japan. All rights reserved.
PY - 2020/11/15
Y1 - 2020/11/15
N2 - We have measured the temperature dependences of the thermal conductivity of LaSrFe1−xGaxO4 (x ¼ 0; 0:01) single crystals with a two-dimensional (2D) antiferromagnetic (AF) spin network of Fe3+ spins with the spin quantum number S = 5=2 in zero field and a magnetic field of 14 T. A peak originating from the thermal conductivity due to spins, κspin, has been observed at ∼110 K in the temperature dependence of the thermal conductivity in the ab-plane parallel to the 2D AF spin network. The maximum value of κspin is ∼12 W=Km, which is comparable to that in La2CuO4 with a 2D AF spin system of S = 1=2. By comparison with the temperature dependence of κspin in La2CuO4, we have found that the peak temperature where κspin shows a peak tends to increase with increasing width of the magnetic energy band, namely, with increasing product of the superexchange interaction between the nearest neighbor spins and the spin quantum number, JS, in 2D AF spin systems. Moreover, it has been concluded that κspin is expected to be enhanced by reducing the amount of impurities and imperfections in a crystal with a 2D AF spin network with a large JS value.
AB - We have measured the temperature dependences of the thermal conductivity of LaSrFe1−xGaxO4 (x ¼ 0; 0:01) single crystals with a two-dimensional (2D) antiferromagnetic (AF) spin network of Fe3+ spins with the spin quantum number S = 5=2 in zero field and a magnetic field of 14 T. A peak originating from the thermal conductivity due to spins, κspin, has been observed at ∼110 K in the temperature dependence of the thermal conductivity in the ab-plane parallel to the 2D AF spin network. The maximum value of κspin is ∼12 W=Km, which is comparable to that in La2CuO4 with a 2D AF spin system of S = 1=2. By comparison with the temperature dependence of κspin in La2CuO4, we have found that the peak temperature where κspin shows a peak tends to increase with increasing width of the magnetic energy band, namely, with increasing product of the superexchange interaction between the nearest neighbor spins and the spin quantum number, JS, in 2D AF spin systems. Moreover, it has been concluded that κspin is expected to be enhanced by reducing the amount of impurities and imperfections in a crystal with a 2D AF spin network with a large JS value.
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U2 - 10.7566/JPSJ.89.114603
DO - 10.7566/JPSJ.89.114603
M3 - Article
AN - SCOPUS:85096478244
SN - 0031-9015
VL - 89
JO - Journal of the Physical Society of Japan
JF - Journal of the Physical Society of Japan
IS - 11
M1 - 114603
ER -