Unusual spin pseudogap behavior in the spin web lattice Cu3Te O6 probed by Te 125 nuclear magnetic resonance

Seung Ho Baek; Hyeon Woo Yeo; Jena Park; Kwang Yong Choi; Bernd Buchner

doi:10.1103/PhysRevResearch.3.033109

Unusual spin pseudogap behavior in the spin web lattice Cu3Te O6 probed by Te 125 nuclear magnetic resonance

Seung Ho Baek, Hyeon Woo Yeo, Jena Park, Kwang Yong Choi, Bernd Buchner

Department of Physics

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

3 Scopus citations

Abstract

We present a Te125 nuclear magnetic resonance (NMR) study in the three-dimensional spin web lattice Cu3TeO6 which harbors topological magnons. The Te125 NMR spectra and the Knight-shift K as a function of temperature show a drastic change at TS∼40K much lower than the Néel ordering temperature TN∼61K, providing evidence for the first-order structural phase transition within the magnetically ordered state. Most remarkably, the temperature dependence of the spin-lattice relaxation rate T1-1 unravels spin-gap-like magnetic excitations, which sharply sets in at T∗∼75K, the temperature well above TN. The spin-gap behavior may be understood by weakly dispersive optical magnon branches of high-energy spin excitations originating from the unique corner-sharing Cu hexagon spin-1/2 network with low coordination number.

Original language	English
Article number	033109
Journal	Physical Review Research
Volume	3
Issue number	3
DOIs	https://doi.org/10.1103/PhysRevResearch.3.033109
State	Published - Sep 2021

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10.1103/PhysRevResearch.3.033109

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title = "Unusual spin pseudogap behavior in the spin web lattice Cu3Te O6 probed by Te 125 nuclear magnetic resonance",

abstract = "We present a Te125 nuclear magnetic resonance (NMR) study in the three-dimensional spin web lattice Cu3TeO6 which harbors topological magnons. The Te125 NMR spectra and the Knight-shift K as a function of temperature show a drastic change at TS∼40K much lower than the N{\'e}el ordering temperature TN∼61K, providing evidence for the first-order structural phase transition within the magnetically ordered state. Most remarkably, the temperature dependence of the spin-lattice relaxation rate T1-1 unravels spin-gap-like magnetic excitations, which sharply sets in at T∗∼75K, the temperature well above TN. The spin-gap behavior may be understood by weakly dispersive optical magnon branches of high-energy spin excitations originating from the unique corner-sharing Cu hexagon spin-1/2 network with low coordination number.",

author = "Baek, \{Seung Ho\} and Yeo, \{Hyeon Woo\} and Jena Park and Choi, \{Kwang Yong\} and Bernd Buchner",

note = "Publisher Copyright: {\textcopyright} 2021 authors. Published by the American Physical Society.",

year = "2021",

month = sep,

doi = "10.1103/PhysRevResearch.3.033109",

language = "English",

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TY - JOUR

T1 - Unusual spin pseudogap behavior in the spin web lattice Cu3Te O6 probed by Te 125 nuclear magnetic resonance

AU - Baek, Seung Ho

AU - Yeo, Hyeon Woo

AU - Park, Jena

AU - Choi, Kwang Yong

AU - Buchner, Bernd

PY - 2021/9

Y1 - 2021/9

N2 - We present a Te125 nuclear magnetic resonance (NMR) study in the three-dimensional spin web lattice Cu3TeO6 which harbors topological magnons. The Te125 NMR spectra and the Knight-shift K as a function of temperature show a drastic change at TS∼40K much lower than the Néel ordering temperature TN∼61K, providing evidence for the first-order structural phase transition within the magnetically ordered state. Most remarkably, the temperature dependence of the spin-lattice relaxation rate T1-1 unravels spin-gap-like magnetic excitations, which sharply sets in at T∗∼75K, the temperature well above TN. The spin-gap behavior may be understood by weakly dispersive optical magnon branches of high-energy spin excitations originating from the unique corner-sharing Cu hexagon spin-1/2 network with low coordination number.

AB - We present a Te125 nuclear magnetic resonance (NMR) study in the three-dimensional spin web lattice Cu3TeO6 which harbors topological magnons. The Te125 NMR spectra and the Knight-shift K as a function of temperature show a drastic change at TS∼40K much lower than the Néel ordering temperature TN∼61K, providing evidence for the first-order structural phase transition within the magnetically ordered state. Most remarkably, the temperature dependence of the spin-lattice relaxation rate T1-1 unravels spin-gap-like magnetic excitations, which sharply sets in at T∗∼75K, the temperature well above TN. The spin-gap behavior may be understood by weakly dispersive optical magnon branches of high-energy spin excitations originating from the unique corner-sharing Cu hexagon spin-1/2 network with low coordination number.

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U2 - 10.1103/PhysRevResearch.3.033109

DO - 10.1103/PhysRevResearch.3.033109

M3 - Article

AN - SCOPUS:85115888651

SN - 2643-1564

VL - 3

JO - Physical Review Research

JF - Physical Review Research

IS - 3

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ER -

Unusual spin pseudogap behavior in the spin web lattice Cu3Te O6 probed by Te 125 nuclear magnetic resonance

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