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强关联体系中的轨道有序及其成因一直是凝聚态物理研究的热点问题.轨道有序对于巨磁阻和超导材料的研究有非常重要的地位.利用第一性原理计算研究了KCrF3的四方相和立方相中的轨道有序及其成因.在四方相中, GGA和GGA+U两种方法计算结果都表明其基态是A型反铁磁和G型轨道有序. 对于立方结构, GGA方法得出铁磁半金属态是基态,而GGA+U(Ueff = 3.0 eV)得到的基态是A型反铁磁绝缘体. 光电导测量是少数能从实验上观察到轨道有序的方法之一,因此计算了其光电导,并结合投影态密度讨论了KCrF3中的轨道有序.最后找到了其轨道有序的成因:电子强关联效应,而非电-声子相互作用是其轨道有序的物理根源.
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关键词:
- 第一性原理 /
- 轨道有序 /
- 光电导 /
- Jahn-Teller效应
The electronic, the magnetic and the orbital structures of KCrF3 are studied by first principles in its recently identified crystallographic phases (tetragonal and cubic) [Margadonna and Karotsis 2006 J. Am. Chem. Soc. 128 16436]. In tetragonal phase, both generalized gradient approximation (GGA) and GGA+U calculations show that the ground state is the A-type antiferromagnetic (A-AFM) configuration with G-type orbital ordering pattern. Our calculations show that the orbital structures and the magnetic configurations can be measured by the optical conductivity. In the cubic state, the GGA calculations show that the ground state is ferromagnetic half metal state, while the GGA+U(Ueff = 3.0 eV) calculations show that the A-AFM insulator phase is the ground state. Our calculations indicate that the electron-electron interactions rather than the electron-phonon interactions are the driving forces behind the orbital order.-
Keywords:
- first principles /
- orbital ordering /
- optical conductivity /
- Jahn-Teller effect
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[1] Fang Z, Terakura K 2001 Phys. Rev. B 64 R020509
[2] Fang Z, Terakura K 2002 J. Phys.: Condens. Matter 14 3001
[3] Fang Z, Nagaosa N, Terakura K 2003 Phys. Rev. B 67 035101
[4] Fang Z, Nagaosa N, Terakura K 2004 Phys. Rev. B 69 045116
[5] Fang Z, Nagaosa N 2004 Phys. Rev. Lett. 93 176404
[6] Shu Z H, Dong J M 2003 Acta Phys. Sin. 52 2918 (in Chinese) [束正煌,董锦明 2003 52 2918]
[7] Zhang S L, Kong H, Cen C, Su J R, Zhu C F 2005 Acta Phys. Sin.54 4379 (in Chinese) [张士龙, 孔辉, 岑诚,苏金瑞,朱长飞 2005 54 4379]
[8] Chen D M, Liu D Y 2010 Acta Phys. Sin. 59 7350 (in Chinese) [陈东猛,刘大勇 2010 59 7350]
[9] Yu Q Y, Zhang J C, Jia R R, Jing C, Cao S X 2008 Acta Phys. Sin.57 453 (in Chinese) [於乾英,张金仓,贾蓉蓉,敬超,曹世勋 2008 57 453]
[10] Wang W, Su J F, Liu M, Liu S 2009 Acta Phys. Sin. 58 5632 (in Chinese) [王玮,孙家法,刘楣,刘甦 2009 58 5632]
[11] Elfimov I S, Anisimov V I, Sawatzky G A 1999 Phys. Rev. Lett.82 4264
[12] Margadonna S, Karotsis G 2006 J. Am. Chem. Soc. 128 16436
[13] Margadonna S, Karotsis G 2007 J. Mater. Chem. 17 2013
[14] Giovannetti G, Margadonna S, van den Brink J 2008 Phys. Rev. B77 075113
[15] Xiao Y, Su Y, Li H F, Kumar CMN, Mittal R, Persson J, SenyshynA, Gross K, Brueckel T H 2010 Phys. Rev. B 82 094437
[16] Xu Y, Hao X, Lü M, Wu Z, Zhou D, Meng J 2008 J. Chem. Phys.128 164721
[17] Saitoh E, Okamoto S, Takahashi K T, Tobe K, Yamamoto K,Kimura T, Ishihara S, Maekawa S, Tokura Y 2001 Nature 410180
[18] Murakami Y, Hill J P, Gibbs D, Blume M, Koyama I, Tanaka M,Kawata H, Arima T, Tokura Y, Hirota K, Endoh Y 1998 Phys. Rev.Lett. 81 582
[19] Tobe K, Kimura T, Okimoto Y, Tokura K 2001 Phys. Rev. B 64184421
[20] Hu W Z, Dong J, Li G, Li Z, Zheng P, Chen G F, Luo J L, Wang N L 2008 Phys. Rev. Lett. 101 257005
[21] Li G, Hu W Z, Dong J , Li Z, Zheng P, Chen G F, Luo J L, Wang N L 2008 Phys. Rev. Lett. 101 107004
[22] Li G, Hu W Z , Dong J, Qian D, Hsieh D, Hasan M Z, Morosan E, Cava R J, Wang N L 2007 Phys. Rev. Lett. 99 167002
[23] Chen Z G, Dong T, Ruan R H, Hu B F, Cheng B, Hu W Z, ZhengP, Fang Z, Dai X, Wang N L 2010 Phys. Rev. Lett. 105 097003
[24] Loa I, Adler P, Grzechnik A, Syassen K, Schwarz U, Hanfland M,Rozenberg G K H, Gorodetsky P, Pasternak M P 2001 Phys. Rev.Lett. 87 125501
[25] Popović Z, Satpathy S 2002 Phys. Rev. Lett. 88 197201
[26] Leonov I, Binggeli N, Korotin D M, Anisimov V I, Stojić N, VollhardtD 2008 Phys. Rev. Lett. 101 096405
[27] Medvedeva J E, Korotin M A, Anisimov V I, Freeman A J 2002Phys. Rev. B 65 172413
[28] Perdew J P, Wang Y 1992 Phys. Rev. B 45 13244
[29] Liechtenstein A I, Anisimov V I, Zaanen J 1995 Phys. Rev. B 52R5467
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