Detailed Information on Publication Record
2016
Exact diagonalization study of the effects of Zn and Ni impurities on the pseudogap of underdoped cuprate high-Tc superconductors
VAŠÁTKO, Jiří and Dominik MUNZARBasic information
Original name
Exact diagonalization study of the effects of Zn and Ni impurities on the pseudogap of underdoped cuprate high-Tc superconductors
Authors
VAŠÁTKO, Jiří (203 Czech Republic, belonging to the institution) and Dominik MUNZAR (203 Czech Republic, guarantor, belonging to the institution)
Edition
Physical Review B, American Physical Society, 2016, 2469-9950
Other information
Language
English
Type of outcome
Článek v odborném periodiku
Field of Study
10302 Condensed matter physics
Country of publisher
United States of America
Confidentiality degree
není předmětem státního či obchodního tajemství
References:
Impact factor
Impact factor: 3.836
RIV identification code
RIV/00216224:14310/16:00090945
Organization unit
Faculty of Science
UT WoS
000371729000007
Keywords in English
Cuprate superconductors; Infrared response; Pseudogap
Tags
International impact, Reviewed
Změněno: 5/4/2017 18:26, Ing. Andrea Mikešková
Abstract
V originále
The influence of Zn and Ni impurities on the normal-state pseudogap of underdoped high-Tc cuprate superconductors is studied using exact diagonalization of effective t - J-like Hamiltonians describing low energy electronic excitations of the CuO2 plane with some of the copper ions replaced with Zn/Ni. The Ni case Hamiltonian has been obtained by a sequence of approximations from a more complete model involving Cu 3d, Ni 3d, and O 2p orbitals. Our main findings are: (i) The width OmegaPG of the pseudogap occurring in the many body density of states, and manifesting itself also in the c-axis infrared conductivity, decreases with increasing Zn concentration as a consequence of a suppression of short range spin correlations. (ii) In the case of one hole and one Ni impurity, the hole is, for realistic values of the model parameters, weakly bound to the Ni site. This causes a slight increase of OmegaPG with respect to the pure case. (iii) Based on this result and further results for 1 to 2 holes and 1 to 2 Ni impurities, we suggest that in the real Ni substituted CuO2 plane OmegaPG is larger than in the pure case due to the binding of the doped holes to the Ni sites and effective underdoping. Our findings clarify the trends observed in the c-axis infrared conductivity data of Zn and Ni substituted (Sm,Nd)Ba2Cu3O7 - delta crystals.
Links
| LQ1601, research and development project |
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| MUNI/A/1388/2015, interní kód MU |
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| MUNI/A/1496/2014, interní kód MU |
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