Pressure Effects in Ferromagnetism of Orbital Ordering Ferromagnet
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概要
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We have sttudied pressure effects on layered Perovskite-type orbital ordering ferrornagnetKzCuF,t, particularly the presstrre-indtrced transition frona ferromagnetic (F) to antiferronuagnetic (AF) state. First the magnetic phase diagrana of sixnple one-dimensional ?nulti-bazad Hub-bard Harniltonian with antiferrodistortive order is constrvrcted with exact diagonalization pro-cedure. It is found that AF and helical (Hl) states can be stalale in a region of large transferenergy even xvith keeping antiferrodistortive order. For tauore realistic two-diraaensioraal unodelsrelevant to CLlF2 plane in K2CLlF4 the tnagnetic plaase diagrarn is derived by perturbational pro-cedtzre. Judging frona the parattaeter values estiunated by FLAPW band calctrlations for K2CUF4under higla pressture as well as at arnbient pressture, it is concluded that the presstrre-iu?duced FAF transition xaaay be realized in K2CV1F4 xvithovrt structural transition from antiferr'odistortiveto ferrodistortive pl'nase. Fttrther the observed pressure deperadence of 'Z'C of K2CL1F4 can beexplaiuaed qtralitatively by otrr theory.
- 1997-08-15
著者
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SUZUKI Naoshi
Department of Material Physics,Faculty of Engineering Science,Osaka University
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Kawamoto Tohru
Department of Material Physics,Faculty of Engineering Science,Osaka University
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Kawamoto Tohru
Department Of Material Physics Faculty Of Engineering Science Osaka University
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Suzuki Naoshi
Department Of Material Phsics Faculty Of Engineering Science Osaka University
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