Details
| Originalsprache | Englisch |
|---|---|
| Fachzeitschrift | Physical Review B |
| Jahrgang | 101 |
| Ausgabenummer | 22 |
| Publikationsstatus | Veröffentlicht - 1 Juni 2020 |
| Extern publiziert | Ja |
Abstract
We present muon spin relaxation (μSR) measurements of the S=3/2 undistorted triangular lattice established in RbAg2Cr[VO4]2. The zero-(ZF) and longitudinal-field μSR spectra evidence the absence of spin freezing and long-range magnetic ordering down to T=25 mK, supporting the formation of a dynamic ground state. Noticeably, we observe an anomalous temperature dependence of the ZF muon spin relaxation rate λZF(T), featuring a decrease below T=20 K. This suggests the alteration of the dominant relaxation mechanism by the development of short-range magnetic correlations. A subsequent leveling off of λZF(T) below T=2 K indicates persistent spin dynamics and reveals the presence of exotic magnetic excitations. The field dependence of the muon spin relaxation rate at T=25 mK is well described by a diffusive spin transport model with algebraic spin-spin correlations. The suppressed long-range order and the peculiar temperature-dependent behavior of λZF(T) will be discussed in terms of the exchange interaction between Cr3+ moments via nonmagnetic [VO4]3- entities. In the title compound, the degeneracy of the t2g-orbital set is not lifted by a space group symmetry reduction or subject to significant anisotropy resulting from spin-orbit coupling.
ASJC Scopus Sachgebiete
- Werkstoffwissenschaften (insg.)
- Elektronische, optische und magnetische Materialien
- Physik und Astronomie (insg.)
- Physik der kondensierten Materie
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in: Physical Review B, Jahrgang 101, Nr. 22, 01.06.2020.
Publikation: Beitrag in Fachzeitschrift › Artikel › Forschung › Peer-Review
}
TY - JOUR
T1 - Unconventional spin excitations in the S= 32 triangular antiferromagnet RbAg2Cr[VO4]2
AU - Lee, S.
AU - Klauer, R.
AU - Menten, J.
AU - Lee, W.
AU - Yoon, S.
AU - Luetkens, H.
AU - Lemmens, P.
AU - Möller, A.
AU - Choi, K. Y.
N1 - Funding information: We would like to thank B. Hitti (TRIUMF, Vancouver, Canada) for technical support. This works was supported by Korea Research Foundation (KRF) Grants No. 2017R1A2B3012642, No. 2019-0571, and No. 2013M7A1A1075764 funded by the Korea government (MEST). A.M. acknowledges the Carl-Zeiss-Foundation. Support by the German Science Foundation (DFG), DFG INST 247/875-1, DFG Le967/16-1, and DFG EXC 2123, is gratefully acknowledged.
PY - 2020/6/1
Y1 - 2020/6/1
N2 - We present muon spin relaxation (μSR) measurements of the S=3/2 undistorted triangular lattice established in RbAg2Cr[VO4]2. The zero-(ZF) and longitudinal-field μSR spectra evidence the absence of spin freezing and long-range magnetic ordering down to T=25 mK, supporting the formation of a dynamic ground state. Noticeably, we observe an anomalous temperature dependence of the ZF muon spin relaxation rate λZF(T), featuring a decrease below T=20 K. This suggests the alteration of the dominant relaxation mechanism by the development of short-range magnetic correlations. A subsequent leveling off of λZF(T) below T=2 K indicates persistent spin dynamics and reveals the presence of exotic magnetic excitations. The field dependence of the muon spin relaxation rate at T=25 mK is well described by a diffusive spin transport model with algebraic spin-spin correlations. The suppressed long-range order and the peculiar temperature-dependent behavior of λZF(T) will be discussed in terms of the exchange interaction between Cr3+ moments via nonmagnetic [VO4]3- entities. In the title compound, the degeneracy of the t2g-orbital set is not lifted by a space group symmetry reduction or subject to significant anisotropy resulting from spin-orbit coupling.
AB - We present muon spin relaxation (μSR) measurements of the S=3/2 undistorted triangular lattice established in RbAg2Cr[VO4]2. The zero-(ZF) and longitudinal-field μSR spectra evidence the absence of spin freezing and long-range magnetic ordering down to T=25 mK, supporting the formation of a dynamic ground state. Noticeably, we observe an anomalous temperature dependence of the ZF muon spin relaxation rate λZF(T), featuring a decrease below T=20 K. This suggests the alteration of the dominant relaxation mechanism by the development of short-range magnetic correlations. A subsequent leveling off of λZF(T) below T=2 K indicates persistent spin dynamics and reveals the presence of exotic magnetic excitations. The field dependence of the muon spin relaxation rate at T=25 mK is well described by a diffusive spin transport model with algebraic spin-spin correlations. The suppressed long-range order and the peculiar temperature-dependent behavior of λZF(T) will be discussed in terms of the exchange interaction between Cr3+ moments via nonmagnetic [VO4]3- entities. In the title compound, the degeneracy of the t2g-orbital set is not lifted by a space group symmetry reduction or subject to significant anisotropy resulting from spin-orbit coupling.
UR - http://www.scopus.com/inward/record.url?scp=85086998458&partnerID=8YFLogxK
U2 - 10.1103/PhysRevB.101.224420
DO - 10.1103/PhysRevB.101.224420
M3 - Article
AN - SCOPUS:85086998458
VL - 101
JO - Physical Review B
JF - Physical Review B
SN - 2469-9950
IS - 22
ER -