Naslov
Singlet state formation and its impact on the magnetic structure in the tetramer system SeCuO3

Autori
Cvitanić, Tonči ; Šurija, Vinko ; Prša, Krunoslav ; Zaharko, Oksana ; Kupčić, Ivan ; Babkevich, Peter ; Frontzek, Matthias ; Požek, Miroslav ; Berger, Helmuth ; Magrez, Arnaud ; Ronnow, Henrik M. ; Grbić, Mihael S. ; Živković, Ivica

Izvornik
Physical review. B. (2469-9950) 98 (2018), 5; 054409-1

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
NMR ; neutrons ; singlet ; tetramer ; quantum magnetism

Sažetak
We present an experimental investigation of the magnetic structure in a tetramer system SeCuO3 using neutron powder di raction and nuclear resonance techniques. We establish a commensurate antiferromagnetic ordering with a propagation vector k = (0 ; 0 ; 1). The order parameter follows a critical behavior near TN = 8 K, with a critical exponent beta = 0.32 in agreement with a 3D universality class. Evidence is presented that a singlet state starts to form on tetramers at temperatures as high as 200 K, and its signature is preserved within the ordered state through a strong renormalization of the ordered magnetic moment on two non-equivalent copper sites, m(Cu1) ~  0.35 uB and m(Cu2) < 0.8 uB at 1.5 K.

Izvorni jezik
Engleski

Znanstvena područja
Fizika

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