Exact diagonalization study of the effects of Zn and Ni
impurities on the pseudogap of underdoped cuprate high-Tc
superconductors

J 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 MUNZAR

Basic 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:

Článek na www str. nakladatele.

Impact factor

Impact factor: 3.836

RIV identification code

RIV/00216224:14310/16:00090945

Organization unit

Faculty of Science

DOI

http://dx.doi.org/10.1103/PhysRevB.93.094512

UT WoS

000371729000007

Keywords in English

Cuprate superconductors; Infrared response; Pseudogap

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

Name: CEITEC 2020 (Acronym: CEITEC2020)

Investor: Ministry of Education, Youth and Sports of the CR

MUNI/A/1388/2015, interní kód MU

Name: Struktura, elektronová struktura a optická odezva pokročilých materiálů V

Investor: Masaryk University, Category A

MUNI/A/1496/2014, interní kód MU

Name: Struktura, elektronová struktura a optická odezva pokročilých materiálů IV

Investor: Masaryk University, Category A

Citovat

VAŠÁTKO, Jiří and Dominik MUNZAR. Exact diagonalization study of the effects of Zn and Ni impurities on the pseudogap of underdoped cuprate high-Tc superconductors. Physical Review B. American Physical Society, 2016, vol. 93, No 9, p. "nestrankovano", 12 pp. ISSN 2469-9950. Available from: https://dx.doi.org/10.1103/PhysRevB.93.094512.

@article{1355209,
   author = {Vašátko, Jiří and Munzar, Dominik},
   article_number = {9},
   doi = {http://dx.doi.org/10.1103/PhysRevB.93.094512},
   keywords = {Cuprate superconductors; Infrared response; Pseudogap},
   language = {eng},
   issn = {2469-9950},
   journal = {Physical Review B},
   title = {Exact diagonalization study of the effects of Zn and Ni impurities on the pseudogap of underdoped cuprate high-Tc superconductors},
   url = {http://journals.aps.org/prb/pdf/10.1103/PhysRevB.93.094512},
   volume = {93},
   year = {2016}
}

TY  - JOUR
ID  - 1355209
AU  - Vašátko, Jiří - Munzar, Dominik
PY  - 2016
TI  - Exact diagonalization study of the effects of Zn and Ni impurities on the pseudogap of underdoped cuprate high-Tc superconductors
JF  - Physical Review B
VL  - 93
IS  - 9
SP  - "nestrankovano"
EP  - "nestrankovano"
PB  - American Physical Society
SN  - 24699950
KW  - Cuprate superconductors
KW  - Infrared response
KW  - Pseudogap
UR  - http://journals.aps.org/prb/pdf/10.1103/PhysRevB.93.094512
L2  - http://journals.aps.org/prb/pdf/10.1103/PhysRevB.93.094512
N2  - 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.
ER  -

VAŠÁTKO, Jiří and Dominik MUNZAR. Exact diagonalization study of the effects of Zn and Ni impurities on the pseudogap of underdoped cuprate high-Tc superconductors. \textit{Physical Review B}. American Physical Society, 2016, vol.~93, No~9, p.~''nestrankovano'', 12 pp. ISSN~2469-9950. Available from: https://dx.doi.org/10.1103/PhysRevB.93.094512.

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