Neutron Scattering Peak in the High-T_c Cuprate Superconductors
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概要
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As a jcossible explanation f'or the taetrtron reson?tt?ce peak observed in YBat3Ctt3O(3?., spin excitons in taearly antif'errormagnetic strpercondtrctors are sttrdied on a nearly half-filled 2-diunensionalHubbard uaaodel. Tlte dynaraaical spin strsceptiloility of' tlae BCS supercondtrctor xvith a given gulp['ttnction is ca1ctrl?tted by trsing tlae randotn ph?rse approxiuaaation. We sttrdy the dispersion srndbroardenitag of excitons and find tluat the peak ?tppears in 21, lirnited range of q-sp;tce ar'outad tlaeantif'erronaagt'xetic xrector(m,vr). NX'e 21180 sttrdy luow this phenotaaetaon depends on the strengthof' tlae ora-site interaction U, the autaplitvnde Ac) of flue d-watve gap f'trnction, and the occtrpationtatrrnber<77>. The results seena to foe consistent art least qtralitatively with flue experirnerntal re-strlts 011 YBa3Ctr307. It is f'otrrud tla?'tt the exciton peak tends to disappear f'or relatively staaallvaltres of' 2s0. This uaaight Toe related xvith the alasence of' resonance peak in La,z .Sr..Ctr0.j. Nospin excitoru peak is expected in s- or extended s-xvave strperconductors.
- 社団法人日本物理学会の論文
- 1999-04-15
著者
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Moriya Toru
Department Of Physics Faculty Of Science And Technology Science University Of Tokyo
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Yoshikawa Hideyuki
Department Of Physics Faculty Of Science And Technology Science University Of Tokyo
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Moriya Toru
Deparment Of Physics Wasea University
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