Unusual spin pseudogap behavior in the spin web latticeCu3TeO6probed byTe125nuclear magnetic resonance,Physical Review Research

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Unusual spin pseudogap behavior in the spin web latticeCu3TeO6probed byTe125nuclear magnetic resonance
Physical Review Research ( IF 3.5 ) Pub Date : 2021-08-02 , DOI: 10.1103/physrevresearch.3.033109
Seung-Ho Baek _{1,

2} , Hyeon Woo Yeo ₁ , Jena Park ₃ , Kwang-Yong Choi ₄ , Bernd Büchner _{5,

6}

Affiliation

We present a

{}^{125}{Te}

nuclear magnetic resonance (NMR) study in the three-dimensional spin web lattice

{Cu}_{3} Te O_{6}

which harbors topological magnons. The

{}^{125}{Te}

NMR spectra and the Knight-shift

K

as a function of temperature show a drastic change at

T_{S} \sim 40 K

much lower than the Néel ordering temperature

T_{N} \sim 61 K

, 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

T_{1}^{- 1}

unravels spin-gap-like magnetic excitations, which sharply sets in at

T^{*} \sim 75 K

, the temperature well above

T_{N}

. 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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