Silver route to cuprate analogs

被引：54

作者：

Gawraczynski, Jakub ^{[1
,2
]}

Kurzydlowski, Dominik ^{[1
,3
]}

Ewings, Russell A. ^{[4
]}

Bandaru, Subrahmanyam ^{[1
]}

Gadomski, Wojciech ^{[2
]}

Mazej, Zoran ^{[5
]}

Ruani, Giampiero ^{[6
]}

Bergenti, Ilaria ^{[6
]}

Jaron, Tomasz ^{[1
]}

Ozarowski, Andrew ^{[7
]}

Hill, Stephen ^{[7
,8
]}

Leszczynski, Piotr J. ^{[1
]}

Tokar, Kamil ^{[9
,10
]}

Derzsi, Mariana ^{[1
,10
]}

Barone, Paolo ^{[11
]}

Wohlfeld, Krzysztof ^{[12
]}

Lorenzana, Jose ^{[13
]}

Grochala, Wojciech ^{[1
]}

机构：

[1] Univ Warsaw, Ctr New Technol, PL-02089 Warsaw, Poland

[2] Univ Warsaw, Fac Chem, PL-02093 Warsaw, Poland

[3] Cardinal Stefan Wyszynski Univ Warsaw, Fac Math & Nat Sci, PL-01938 Warsaw, Poland

[4] Rutherford Appleton Lab, ISIS Facil, Sci & Technol Facil Council, Didcot OX11 0QX, Oxon, England

[5] Jozef Stefan Inst, Dept Inorgan Chem & Technol, SI-1000 Ljubljana, Slovenia

[6] CNR, Inst Nanostruct Mat ISMN, I-40129 Bologna, Italy

[7] Florida State Univ, Natl High Magnet Field Lab, Tallahassee, FL 32310 USA

[8] Florida State Univ, Dept Phys, Tallahassee, FL 32306 USA

[9] Slovak Acad Sci, Inst Phys, Bratislava 84511, Slovakia

[10] Slovak Univ Technol Bratislava, Fac Mat Sci & Technol Trnava, Adv Technol Res Inst, Trnava 91724, Slovakia

[11] CNR, Superconducting & Other Innovat Mat & Devices Ins, I-66100 Chieti, Italy

[12] Univ Warsaw, Fac Phys, PL-02093 Warsaw, Poland

[13] Univ Roma La Sapienza, Inst Complex Syst ISC, Dipartimento Fis, CNR, I-00185 Rome, Italy

来源：

PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA | 2019年 / 116卷 / 05期

关键词：

silver fluorides; superconductivity; cuprates; strong correlation; quantum magnetism; STRONG ANTIFERROMAGNETIC SUPEREXCHANGE; ELECTRONIC-STRUCTURE; MAGNETIC-STRUCTURE; SPIN EXCITATIONS; CRYSTAL; FLUORIDES; TRANSITION; PREDICTION; DIFLUORIDE; BEHAVIOR;

D O I：

10.1073/pnas.1812857116

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

The parent compound of high-T-c superconducting cuprates is a unique Mott insulator consisting of layers of spin-1/2 ions forming a square lattice and with a record high in-plane antiferromagnetic coupling. Compounds with similar characteristics have long been searched for without success. Here, we use a combination of experimental and theoretical tools to show that commercial AgF2 is an excellent cuprate analog with remarkably similar electronic parameters to La2CuO4 but larger buckling of planes. Two-magnon Raman scattering and inelastic neutron scattering reveal a superexchange constant reaching 70% of that of a typical cuprate. We argue that structures that reduce or eliminate the buckling of the AgF2 planes could have an antiferromagnetic coupling that matches or surpasses the cuprates.

引用

页码：1495 / 1500

页数：6

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