Gapless dynamic magnetic ground state in the charge-gapped trimer iridate Ba 4 NbIr 3 O 12

被引：4

作者：

Bandyopadhyay, Abhisek ^{[1
]}

Lee, S. ^{[2
]}

Adroja, D. T. ^{[1
,3
]}

Lees, M. R. ^{[4
]}

Stenning, G. B. G. ^{[1
]}

Aich, P. ^{[5
,6
]}

Tortora, Luca ^{[5
,6
]}

Meneghini, C. ^{[5
]}

Cibin, G. ^{[7
]}

Berlie, Adam ^{[1
]}

Saha, R. A. ^{[8
]}

Takegami, D. ^{[9
,10
]}

Melendez-Sans, A. ^{[9
]}

Poelchen, G. ^{[9
]}

Yoshimura, M. ^{[11
]}

Tsuei, K. D. ^{[11
]}

Hu, Z. ^{[9
]}

Chan, Ting-Shan ^{[11
]}

Chattopadhyay, S. ^{[12
]}

Thakur, G. S. ^{[13
]}

Choi, Kwang-Yong ^{[14
]}

机构：

[1] STFC Rutherford Appleton Lab, ISIS Neutron & Muon Source, Didcot OX11 0QX, Oxon, England

[2] Inst for Basic Sci Korea, Ctr Artificial Low Dimens Elect Syst, Pohang 37673, South Korea

[3] Univ Johannesburg, Phys Dept, Highly Correlated Matter Res Grp, ZA-2006 Auckland Pk, South Africa

[4] Univ Warwick, Dept Phys, Coventry CV4 7AL, England

[5] Univ Roma Tre, Dipartimento Sci, Via Vasca Navale 84, I-00146 Rome, Italy

[6] Univ Roma Tre, Surface Anal Lab LASR3, Via Vasca Navale 84, I-00146 Rome, Italy

[7] Diamond Light Source Ltd, Diamond House,Harwell Sci & Innovat Campus, Didcot OX11 0DE, Oxon, England

[8] Katholieke Univ Leuven, Dept Microbial & Mol Syst, cMACS, Celestijnenlaan 200F, B-3001 Heverlee, Belgium

[9] Max Planck Inst Chem Phys Solids, Nothnitzer Str 40, D-01187 Dresden, Germany

[10] Waseda Univ, Dept Appl Phys, Shinjuku Ku, Tokyo 1698555, Japan

[11] Natl Synchrotron Radiat Res Ctr, 101 Hsin Ann Rd, Hsinchu 30076, Taiwan

[12] Mumbai Ctr, UGC DAE Consortium Sci Res, 2nd Floor,Common Facil Bldg BARC Campus, Mumbai 400085, India

[13] Indian Inst Sci Educ & Res, Dept Chem Sci, Berhampur 760010, Odisha, India

[14] Sungkyunkwan Univ, Dept Phys, Suwon 16419, South Korea

来源：

PHYSICAL REVIEW MATERIALS | 2024年 / 8卷 / 07期

基金：

新加坡国家研究基金会;

关键词：

QUANTUM-SPIN-LIQUID; TRANSITION; PACKAGE; IRIDIUM; XANES; EXAFS;

D O I：

10.1103/PhysRevMaterials.8.074405

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We present an experimental investigation of the magnetic ground state in Ba4NbIr3O12, a fractional valent trimer iridate. X-ray absorption and photoemission spectroscopy show that the Ir valence lies between 3+ and 4+ while Nb is pentavalent. Combined dc/ac magnetization, specific heat, and muon spin rotation/relaxation (mu SR) measurements reveal no magnetic phase transition down to 0.05 K. Despite a significant Weiss temperature (OW - -15 to -25 K) indicating antiferromagnetic correlations, a quantum spin-liquid (QSL) phase emerges and persists down to 0.1 K. This state likely arises from geometric frustration in the edge-sharing equilateral triangle Ir network. Our mu SR analysis reveals a two-component depolarization, arising from the coexistence of rapidly (90%) and slowly (10%) fluctuating Ir moments. Powder x-ray diffraction and Ir-L3edge x-ray absorption fine structure spectroscopy identify 8-10% Nb/Ir site-exchange, reducing frustration within part of the Ir network, and likely leading to the faster muon spin relaxation, while the structurally ordered Ir ions remain highly geometrically frustrated, giving rise to the rapidly spin-fluctuating QSL ground state. At low temperatures, the magnetic specific heat varies as gamma T + alpha T 2, indicating gapless spinon excitations, and possible Dirac QSL features with linear spinon dispersion, respectively.

引用

页数：20

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