Anomalous spin dynamics in CdCu2(BO3)2 revealed by 11 B NMR and ZF- μsR

W. J. Lee; S. H. Do; Sungwon Yoon; Z. H. Jang; B. J. Suh; J. H. Lee; A. P. Reyes; P. L. Kuhns; H. Luetkens; K. Y. Choi

doi:10.1103/PhysRevB.90.214416

Anomalous spin dynamics in CdCu2(BO3)2 revealed by 11 B NMR and ZF- μsR

W. J. Lee
, S. H. Do
, Sungwon Yoon
, Z. H. Jang
, B. J. Suh
, J. H. Lee
, A. P. Reyes
, P. L. Kuhns
, H. Luetkens
, K. Y. Choi

Research output: Contribution to journal › Article › peer-review

10 Scopus citations

Abstract

We report 11B nuclear magnetic resonance (NMR) and zero-field muon spin relaxation (ZF-μSR) measurements of the anisotropic spin tetramer system CdCu2(BO3)2, which consists of strongly interacting Cu(1) dimers and weakly coupled nonfrustrated Cu(2) spins. Long-range magnetic order is observed at TN=9.8 K by a critical divergence of the nuclear spin-lattice relaxation rate 1/T1 and an appearance of well-defined muon-spin precessions. In addition, we find the spectroscopic signature for a magnetic anomaly at T∗=6.5 K, a few kelvins below TN. For temperatures below T∗,1/T1 ceases to follow a T4.9(1) behavior. Instead, upon cooling below T∗, both 1/T1 and 1/T2 become temperature-independent with a subsequent small drop. The muon frequency and the relative fraction of the Cu magnetic sites show anomalies mostly for Cu(2) spins at T∗. This is ascribed to a Cu(2) spin reorientation. Site-specific change in magnetic structure is discussed in terms of the energy hierarchy of involved exchange interactions and an additional intertetramer interaction that controls magnetism at temperature T∗.

Original language	English
Article number	214416
Journal	Physical Review B - Condensed Matter and Materials Physics
Volume	90
Issue number	21
DOIs	https://doi.org/10.1103/PhysRevB.90.214416
State	Published - 4 Dec 2014
Externally published	Yes

Access to Document

10.1103/PhysRevB.90.214416

Cite this

@article{125105819daa494abf19128ce44e5c62,

title = "Anomalous spin dynamics in CdCu2(BO3)2 revealed by 11 B NMR and ZF- μsR",

abstract = "We report 11B nuclear magnetic resonance (NMR) and zero-field muon spin relaxation (ZF-μSR) measurements of the anisotropic spin tetramer system CdCu2(BO3)2, which consists of strongly interacting Cu(1) dimers and weakly coupled nonfrustrated Cu(2) spins. Long-range magnetic order is observed at TN=9.8 K by a critical divergence of the nuclear spin-lattice relaxation rate 1/T1 and an appearance of well-defined muon-spin precessions. In addition, we find the spectroscopic signature for a magnetic anomaly at T∗=6.5 K, a few kelvins below TN. For temperatures below T∗,1/T1 ceases to follow a T4.9(1) behavior. Instead, upon cooling below T∗, both 1/T1 and 1/T2 become temperature-independent with a subsequent small drop. The muon frequency and the relative fraction of the Cu magnetic sites show anomalies mostly for Cu(2) spins at T∗. This is ascribed to a Cu(2) spin reorientation. Site-specific change in magnetic structure is discussed in terms of the energy hierarchy of involved exchange interactions and an additional intertetramer interaction that controls magnetism at temperature T∗.",

author = "Lee, \{W. J.\} and Do, \{S. H.\} and Sungwon Yoon and Jang, \{Z. H.\} and Suh, \{B. J.\} and Lee, \{J. H.\} and Reyes, \{A. P.\} and Kuhns, \{P. L.\} and H. Luetkens and Choi, \{K. Y.\}",

note = "Publisher Copyright: {\textcopyright} 2014 American Physical Society.",

year = "2014",

month = dec,

day = "4",

doi = "10.1103/PhysRevB.90.214416",

language = "English",

volume = "90",

journal = "Physical Review B - Condensed Matter and Materials Physics",

issn = "1098-0121",

publisher = "American Physical Society",

number = "21",

}

TY - JOUR

T1 - Anomalous spin dynamics in CdCu2(BO3)2 revealed by 11 B NMR and ZF- μsR

AU - Lee, W. J.

AU - Do, S. H.

AU - Yoon, Sungwon

AU - Jang, Z. H.

AU - Suh, B. J.

AU - Lee, J. H.

AU - Reyes, A. P.

AU - Kuhns, P. L.

AU - Luetkens, H.

AU - Choi, K. Y.

PY - 2014/12/4

Y1 - 2014/12/4

N2 - We report 11B nuclear magnetic resonance (NMR) and zero-field muon spin relaxation (ZF-μSR) measurements of the anisotropic spin tetramer system CdCu2(BO3)2, which consists of strongly interacting Cu(1) dimers and weakly coupled nonfrustrated Cu(2) spins. Long-range magnetic order is observed at TN=9.8 K by a critical divergence of the nuclear spin-lattice relaxation rate 1/T1 and an appearance of well-defined muon-spin precessions. In addition, we find the spectroscopic signature for a magnetic anomaly at T∗=6.5 K, a few kelvins below TN. For temperatures below T∗,1/T1 ceases to follow a T4.9(1) behavior. Instead, upon cooling below T∗, both 1/T1 and 1/T2 become temperature-independent with a subsequent small drop. The muon frequency and the relative fraction of the Cu magnetic sites show anomalies mostly for Cu(2) spins at T∗. This is ascribed to a Cu(2) spin reorientation. Site-specific change in magnetic structure is discussed in terms of the energy hierarchy of involved exchange interactions and an additional intertetramer interaction that controls magnetism at temperature T∗.

AB - We report 11B nuclear magnetic resonance (NMR) and zero-field muon spin relaxation (ZF-μSR) measurements of the anisotropic spin tetramer system CdCu2(BO3)2, which consists of strongly interacting Cu(1) dimers and weakly coupled nonfrustrated Cu(2) spins. Long-range magnetic order is observed at TN=9.8 K by a critical divergence of the nuclear spin-lattice relaxation rate 1/T1 and an appearance of well-defined muon-spin precessions. In addition, we find the spectroscopic signature for a magnetic anomaly at T∗=6.5 K, a few kelvins below TN. For temperatures below T∗,1/T1 ceases to follow a T4.9(1) behavior. Instead, upon cooling below T∗, both 1/T1 and 1/T2 become temperature-independent with a subsequent small drop. The muon frequency and the relative fraction of the Cu magnetic sites show anomalies mostly for Cu(2) spins at T∗. This is ascribed to a Cu(2) spin reorientation. Site-specific change in magnetic structure is discussed in terms of the energy hierarchy of involved exchange interactions and an additional intertetramer interaction that controls magnetism at temperature T∗.

UR - https://www.scopus.com/pages/publications/84916223331

U2 - 10.1103/PhysRevB.90.214416

DO - 10.1103/PhysRevB.90.214416

M3 - Article

AN - SCOPUS:84916223331

SN - 1098-0121

VL - 90

JO - Physical Review B - Condensed Matter and Materials Physics

JF - Physical Review B - Condensed Matter and Materials Physics

IS - 21

M1 - 214416

ER -

Anomalous spin dynamics in CdCu2(BO3)2 revealed by 11 B NMR and ZF- μsR

Abstract

Access to Document

Other files and links

Fingerprint

Cite this