The spin entropy suppression induced by Fe3+ in NaCo2O4

2010 ◽  
Vol 107 (9) ◽  
pp. 093707 ◽  
Author(s):  
G. D. Tang ◽  
X. N. Xu ◽  
C. P. Tang ◽  
L. Qiu ◽  
L. Y. Lv ◽  
...  
Keyword(s):  
Spin Entropy

The spin-entropy enhancement induced by Ce doping in Ca 3 Co 4 O 9+δ

2010 ◽  
Vol 91 (1) ◽  
pp. 17002 ◽  
Author(s):  
G. D. Tang ◽  
X. N. Xu ◽  
C. P. Tang ◽  
Z. H. Wang ◽  
Y. He ◽  
...  
Keyword(s):  
Spin Entropy

The sign of lattice and spin entropy change in the giant magnetocaloric materials with negative lattice expansions

2020 ◽  
Vol 512 ◽  
pp. 166983
Author(s):  
Jia-Zheng Hao ◽  
Feng-Xia Hu ◽  
Zi-Bing Yu ◽  
Fei-Ran Shen ◽  
Hou-Bo Zhou ◽  
...  
Keyword(s):  
Entropy Change ◽  
Spin Entropy ◽  
Magnetocaloric Materials

Spin-entropy induced thermopower and spin-blockade effect in CoO

2019 ◽  
Vol 100 (14) ◽  
Author(s):  
Devendra Singh Negi ◽  
Deobrat Singh ◽  
Peter A. van Aken ◽  
R. Ahuja
Keyword(s):  
Spin Entropy ◽  
Spin Blockade

Optimization of the spin entropy by incorporating magnetic ion in a misfit-layered calcium cobaltite

2016 ◽  
Vol 42 (8) ◽  
pp. 9744-9748 ◽  
Author(s):  
Wenchao Yang ◽  
Huicheng Zhang ◽  
Jiaqing Tao ◽  
Dongdong Zhang ◽  
Dewei Zhang ◽  
...  
Keyword(s):  
Spin Entropy ◽  
Magnetic Ion

Nuclear‐Spin Entropy and Librational Degeneracy. Application to Ethane and Diborane

1969 ◽  
Vol 51 (10) ◽  
pp. 4595-4606 ◽  
Author(s):  
Hsien‐Wen Ko ◽  
W. A. Steele
Keyword(s):  
Nuclear Spin ◽  
Spin Entropy

Erratum: “Enhancement of the spin entropy in NaxCo2O4 by Ni doping” [Appl. Phys. Lett. 97, 032108 (2010)]

2011 ◽  
Vol 98 (7) ◽  
pp. 079904
Author(s):  
Guodong Tang ◽  
Teng Yang ◽  
Xiaonong Xu ◽  
Chipui Tang ◽  
Li Qiu ◽  
...  
Keyword(s):  
Ni Doping ◽  
Spin Entropy

scholarly journals Spin-entropy-driven melting of the charge order inLa1.5Sr0.5CoO4

2001 ◽  
Vol 64 (19) ◽  
Author(s):  
I. A. Zaliznyak ◽  
J. M. Tranquada ◽  
R. Erwin ◽  
Y. Moritomo
Keyword(s):  
Charge Order ◽  
Spin Entropy

Enhancement of the spin entropy in NaxCo2O4 by Ni doping

2010 ◽  
Vol 97 (3) ◽  
pp. 032108 ◽  
Author(s):  
Guodong Tang ◽  
Teng Yang ◽  
Xiaonong Xu ◽  
Chipui Tang ◽  
Li Qiu ◽  
...  
Keyword(s):  
Ni Doping ◽  
Spin Entropy

scholarly journals Anomalous Thermopower and High ZT in GeMnTe2 Driven by Spin’s Thermodynamic Entropy

Research ◽  
2021 ◽  
Vol 2021 ◽  
pp. 1-9
Author(s):  
Sichen Duan ◽  
Yinong Yin ◽  
Guo-Qiang Liu ◽  
Na Man ◽  
Jianfeng Cai ◽  
...  
Keyword(s):  
Careful Analysis ◽  
Degree Of Freedom ◽  
Thermoelectric Performance ◽  
Spin Orientation ◽  
Spin Degree ◽  
Spin Entropy ◽  
Thermodynamic Entropy ◽  
Se Doping ◽  
Nor Band ◽  
System Entropy

NaxCoO2 was known 20 years ago as a unique example in which spin entropy dominates the thermoelectric behavior. Hitherto, however, little has been learned about how to manipulate the spin degree of freedom in thermoelectrics. Here, we report the enhanced thermoelectric performance of GeMnTe2 by controlling the spin’s thermodynamic entropy. The anomalously large thermopower of GeMnTe2 is demonstrated to originate from the disordering of spin orientation under finite temperature. Based on the careful analysis of Heisenberg model, it is indicated that the spin-system entropy can be tuned by modifying the hybridization between Te-p and Mn-d orbitals. As a consequent strategy, Se doping enlarges the thermopower effectively, while neither carrier concentration nor band gap is affected. The measurement of magnetic susceptibility provides a solid evidence for the inherent relationship between the spin’s thermodynamic entropy and thermopower. By further introducing Bi doing, the maximum ZT in Ge0.94Bi0.06MnTe1.94Se0.06 reaches 1.4 at 840 K, which is 45% higher than the previous report of Bi-doped GeMnTe2. This work reveals the high thermoelectric performance of GeMnTe2 and also provides an insightful understanding of the spin degree of freedom in thermoelectrics.

Improving the spin entropy by suppressing Co4+ concentration in thermoelectric Ca3Co4O9+δ

2013 ◽  
Vol 39 (2) ◽  
pp. 1341-1344 ◽  
Author(s):  
Guodong Tang ◽  
Feng Xu ◽  
Dewei Zhang ◽  
Zhihe Wang
Keyword(s):  
Spin Entropy
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