Sirko Kamusella
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View article: Nematic fluctuations in iron-oxychalcogenide Mott insulators
Nematic fluctuations in iron-oxychalcogenide Mott insulators Open
Nematic fluctuations occur in a wide range physical systems from biological molecules to cuprates and iron pnictide high- T c superconductors. It is unclear whether nematicity in pnictides arises from electronic spin or orbital degrees of …
View article: Coupled Magnetic and Superconducting Transitions in Sr$_{2}$VO$_{3}$FeAs Under Pressure
Coupled Magnetic and Superconducting Transitions in Sr$_{2}$VO$_{3}$FeAs Under Pressure Open
We report muon spin rotation ($μ$SR) and magnetization measurements on superconducting Sr$_{2}$VO$_{3}$FeAs under pressure. At ambient pressure, Sr$_{2}$VO$_{3}$FeAs undergoes an antiferromagnetic transition of the V moments at $T_{N}$ and…
View article: CSD 1883450: Experimental Crystal Structure Determination
CSD 1883450: Experimental Crystal Structure Determination Open
An entry from the Inorganic Crystal Structure Database, the world’s repository for inorganic crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely availabl…
View article: Hydrothermal synthesis and structure determination of a new calcium iron ruthenium hydrogarnet
Hydrothermal synthesis and structure determination of a new calcium iron ruthenium hydrogarnet Open
A new calcium iron ruthenium hydrogarnet with the approximate composition Ca 3 (Ru 2− x Fe x )(FeO 4 ) 2− y (H 4 O 4 ) 1+ y ( x =1, y ≈0.35) has been obtained by hydrothermal synthesis under oxidizing alkaline conditions. The compound crys…
View article: Low-temperature breakdown of antiferromagnetic quantum critical behavior in FeSe
Low-temperature breakdown of antiferromagnetic quantum critical behavior in FeSe Open
A nematic transition preceding a long-range spin density wave antiferromagnetic phase is a common feature of many parent compounds of Fe-based superconductors. However, in the FeSe system with a nematic transition at Ts ≈ 90 K, no evidence…
View article: CSD 1907214: Experimental Crystal Structure Determination
CSD 1907214: Experimental Crystal Structure Determination Open
An entry from the Inorganic Crystal Structure Database, the world’s repository for inorganic crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely availabl…
View article: Nematic Fluctuations in Iron-Oxychalcogenide Mott Insulators
Nematic Fluctuations in Iron-Oxychalcogenide Mott Insulators Open
Nematic fluctuations occur in a wide range of physical systems from liquid crystals to biological molecules to solids such as exotic magnets, cuprates and iron-based high-$T_c$ superconductors. Nematic fluctuations are thought to be closel…
View article: Magnetic order and spin dynamics in the helical magnetic system Fe$_3$PO$_4$O$_3$
Magnetic order and spin dynamics in the helical magnetic system Fe$_3$PO$_4$O$_3$ Open
The 3$d$-electronic spin dynamics and the magnetic order in Fe$_3$PO$_4$O$_3$ were investigated by muon spin rotation and relaxation ($μ$SR) and $^{57}$Fe Mössbauer spectroscopy. Zero-field (ZF)-$μ$SR and $^{57}$Fe Mössbauer studies confir…
View article: Magnetism and site exchange in CuFeAs and CuFeSb: A microscopic and theoretical investigation
Magnetism and site exchange in CuFeAs and CuFeSb: A microscopic and theoretical investigation Open
We have investigated the magnetic ground state of CuFeAs and CuFeSb by means of 57Fe-Mössbauer spectroscopy, muon spin rotation/relaxation (μSR), neutron diffraction, and electronic structure calculations. Both materials share the 111-LiFe…
View article: 1/3 magnetization plateau and frustrated ferrimagnetism in a sodium iron phosphite
1/3 magnetization plateau and frustrated ferrimagnetism in a sodium iron phosphite Open
The sodium iron phosphite NaFe3(HPO3)2(H2PO3)6 is studied by ac-magnetic susceptibility, pulsed-field magnetization, specific heat, and high-frequency electron spin resonance (HF-ESR) measurements combined with Mössbauer spectroscopy and d…