Julian Piatek

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Ultra Low Temperature Susceptometer and Magnetometer : Study of the Spin Glass Series LiHox Er1-x F4

Julian Piatek

The first part of this thesis discusses technical details relating to measurements of magnetic properties at ultra low temperatures. The implementation of AC susceptibility at temperatures down to 30 mK is introduced and used as a platform to showcase sele ...

EPFL2012

Spangolite: an s = 1/2 maple leaf lattice antiferromagnet?

Henrik Moodysson Rønnow, Julian Piatek, Goran Nilsen

Spangolite, Cu6Al(SO4)(OH)12Cl·3H2O, is a hydrated layered copper sulfate mineral. The Cu2+ ions of each layer form a systematically depleted triangular lattice which approximates a maple leaf lattice. We present details of the crystal structure, which sug ...

2011

Superconducting phase in the layered dichalcogenide 1T-TaS_{2} upon inhibition of the metal-insulator transition

László Forró, Marco Grioni, Henrik Moodysson Rønnow, Helmuth Berger, Julian Piatek, Ping-Hui Lin, Balazs Sipos, Peng Xu

When a Mott metal-insulator transition is inhibited by a small amount of disorder in the layered dichalcogenide 1T-TaS2, an inhomogeneous superconducting state arises below T=2.1 K and coexists with a nearly commensurate charge-density wave. By angle-resol ...

2010

Scale-Free Antiferromagnetic Fluctuations in the s=1/2 Kagome Antiferromagnet Herbertsmithite

Henrik Moodysson Rønnow, Julian Piatek, Goran Nilsen

Neutron spectroscopy and diffuse neutron scattering on herbertsmithite [ZnCu3(OH)(6)Cl-2], a near-ideal realization of the s=1/2 kagome antiferromagnet, reveal the hallmark property of a quantum spin liquid: instantaneous short-ranged antiferromagnetic cor ...

2009

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