Quantum spin liquid ground state in the trimer rhodate Ba4NbRh3O12

被引：4

作者：

Bandyopadhyay, Abhisek ^{[1
]}

Lee, S. ^{[2
]}

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

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

Berlie, Adam ^{[1
]}

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

Saha, R. A. ^{[5
]}

Takegami, D. ^{[6
]}

Melendez-Sans, A. ^{[6
]}

Poelchen, G. ^{[6
]}

Yoshimura, M. ^{[7
]}

Tsuei, K. D.

Hu, Z. ^{[6
]}

Kao, Cheng-Wei ^{[7
]}

Huang, Yu-Cheng ^{[7
]}

Chan, Ting -Shan ^{[7
]}

Choi, Kwang-Yong ^{[8
]}

机构：

[1] Rutherford Appleton Lab, ISIS Neutron & Muon Source, STFC, 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] Katholieke Univ Leuven, cMACS, Dept Microbial & Mol Syst, Celestijnenlaan 200F, B-3001 Heverlee, Belgium

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

[7] Natl Synchrotron Radiat Res Ctr, 101 Hsin Ann Rd, Hsinchu 300092, Taiwan

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

来源：

PHYSICAL REVIEW B | 2024年 / 109卷 / 18期

基金：

英国工程与自然科学研究理事会;

关键词：

VALENCE BOND STATE; MAGNETIC-PROPERTIES; TRANSITION; SCATTERING;

D O I：

10.1103/PhysRevB.109.184403

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Frustrated magnets offer a plethora of exotic magnetic ground states, including quantum spin liquids (QSLs), in which enhanced quantum fluctuations prevent a long-range magnetic ordering of the strongly correlated spins down to lowest temperature. Here we have investigated the trimer based mixed valence hexagonal rhodate Ba4NbRh3O12 using a combination of dc and ac magnetization, electrical resistivity, specific heat, and muon spin rotation/relaxation (mu SR) measurements. Despite the substantial antiferromagnetic exchange interactions, as evident from the Weiss temperature (theta(W) similar to -35 to -45 K), among the Rh-local moments, neither long-range magnetic ordering nor spin freezing is observed down to at least 50 mK, in ac-susceptibility, specific heat, and zero-field mu SR measurements (down to 0.26 K). We ascribe the absence of any magnetic transition to enhanced quantum fluctuations as a result of geometrical frustration arising out of the edge-sharing equilateral Rh-triangular network in the structure. Our longitudinal-field mu SR result evidences persistent spin fluctuations down to 0.26 K, thus stabilizing a dynamic QSL ground state in Ba4NbRh3O12. Furthermore, the magnetic specific heat data at low T reveal a significant T-linear contribution plus a quadratic T dependence, which may indicate the gapless Dirac QSL phenomenology of the spinon excitations with a linear dispersion.

引用

页数：16

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