Publications (20)
Microscopic investigation of the weakly correlated noncentrosymmetric superconductor SrAuSi
N. Barbero, P. K. Biswas, M. Isobe +6
SrAuSi is a noncentrosymmetric superconductor (NCS) with = 1.54 K, which to date has been studied only via macroscopic techniques. By combining nuclear magnetic resonance…
Dimensional crossover of spin chains in a transverse staggered field: an NMR study
F. Casola, T. Shiroka, V. Glazkov +6
Heisenberg spin-1/2 chain materials are known to substantially alter their static and dynamic properties when experiencing an effective transverse staggered field originating from…
Chemical- and hydrostatic-pressure effects on the Kitaev honeycomb material NaIrO
G. Simutis, N. Barbero, K. Rolfs +10
The low-temperature magnetic properties of \tcr{polycrystalline} NaIrO, a candidate material for the realization of a quantum spin-liquid state, were investigated by means…
Room-temperature structural phase transition in the quasi-2D spin-1/2 Heisenberg antiferromagnet Cu(pz)(ClO)
N. Barbero, M. Medarde, T. Shang +5
Cu(pz)(ClO) (with pz denoting pyrazine CHN) is a two-dimensional spin-1/2 square-lattice antiferromagnet with = 4.24 K. Due to a persisting…
Nodeless superconductivity in the noncentrosymmetric ThIrSi compound
D. Tay, T. Shang, Priscila F. S. Rosa +5
The ThIrSi superconductor, with K, is expected to show unusual features in view of its noncentrosymmetric structure and the presence of heavy elements featuring a sizab…
Pressure effects on the electronic properties of the undoped superconductor ThFeAsN
N. Barbero, S. Holenstein, T. Shang +9
The recently synthesized ThFeAsN iron-pnictide superconductor exhibits a of 30 K, the highest of the 1111-type series in absence of chemical doping. To understand how pressur…
Nodal-to-nodeless superconducting order parameter in LaFeAsPO synthesized under high pressure
T. Shiroka, N. Barbero, R. Khasanov +3
Similar to chemical doping, pressure produces and stabilizes new phases of known materials, whose properties may differ greatly from those of their standard counterparts. Here, by…
Pressure and magnetic field effects on a quasi-2D spin-1/2 Heisenberg antiferromagnet
N. Barbero, T. Shiroka, C. P. Landee +3
Cu(pz)2(ClO4)2 (with pz denoting pyrazine, C4H4N2) is among the best realizations of a two-dimensional spin-1/2 square-lattice antiferromagnet. Below T_N = 4.21 K, its weak interla…
Distribution of NMR relaxations in a random Heisenberg chain
T. Shiroka, F. Casola, V. Glazkov +4
Nuclear magnetic resonance (NMR) measurements of the 29Si spin-lattice relaxation time T1 were used to probe the spin-1/2 random Heisenberg chain compound BaCu2(Si(1-x)Gex)2O7. Rem…
Direct observation of impurity-induced magnetism in an S = 1/2 antiferromagnetic Heisenberg 2-leg spin ladder
F. Casola, T. Shiroka, S. Wang +4
Nuclear magnetic resonance and magnetization measurements were used to probe the magnetic features of single-crystalline Bi(Cu(1-x)Znx)2PO6 with 0<x<0.05 at temperatures between 2.…
Doping-induced superconductivity of ZrB and HfB
N. Barbero, T. Shiroka, B. Delley +5
Unlike the widely studied -type two-gap superconductor MgB, the chemically similar compounds ZrB and HfB do not superconduct above 1 K. Yet, it has been shown that s…
Fully-gapped superconducting state in interstitial-carbon-doped Zr5Pt3
T. Shang, J. Philippe, X. Y. Zhu +6
We report a comprehensive study of the ZrPtC superconductors, with interstitial carbon comprised between 0 and 0.3. At a macroscopic level, their superconductivity, wit…
Pairing of weakly correlated electrons in the platinum-based centrosymmetric superconductor SrPt3P
T. Shiroka, M. Pikulski, N. D. Zhigadlo +3
We report a study of the normal- and superconducting-state electronic properties of the centrosymmetric compound SrPt3P via 31P nuclear-magnetic-resonance (NMR) and magnetometry in…
Phase diagram of low-dimensional antiferromagnets with competing order parameters: A Ginzburg-Landau-theory approach
V. N. Glazkov, F. Casola, H. -R. Ott +1
We present a detailed analysis of the phase diagram of antiferromagnets with competing exchange-driven and field-induced order parameters. By using the quasi-1D antiferromagnet BaC…
Two Coupled Chains are Simpler than One: Field-induced Chirality in a Frustrated Quantum Spin Ladder
M. Pikulski, T. Shiroka, F. Casola +5
Although the frustrated spin chain (zigzag chain) is a Drosophila of frustrated magnetism, the understanding of a pair of coupled zigzag chains (frustrated spin ladder) in a magnet…
Nodeless superconductivity and preserved time-reversal symmetry in the noncentrosymmetric Mo3P superconductor
T. Shang, J. Philippe, J. A. T. Verezhak +10
We report a comprehensive study of the noncentrosymmetric superconductor MoP. Its bulk superconductivity, with K, was characterized via electrical resistivity, magn…
High- superconductivity in undoped ThFeAsN
T. Shiroka, T. Shang, C. Wang +4
Unlike the widely studied ReFeAsO series, the newly discovered iron-based superconductor ThFeAsN exhibits a remarkably high critical temperature of 30 K, without chemical doping or…
From order to randomness: Onset and evolution of the random-singlet state in bond-disordered BaCu(SiGe)O spin-chain compounds
T. Shiroka, F. Eggenschwiler, H. -R. Ott +1
Heisenberg-type spin-chain materials have been extensively studied over the years, yet not much is known about their behavior in the presence of disorder. Starting from BaCuSi$…
Impact of strong disorder on the static magnetic properties of the spin-chain compound BaCu2SiGeO7
T. Shiroka, F. Casola, W. Lorenz +3
The disordered quasi-1D magnet BaCu2SiGeO7 is considered as one of the best physical realizations of the random Heisenberg chain model, which features an irregular distribution of…
Field-induced quantum soliton lattice in a frustrated two-leg spin-1/2 ladder
F. Casola, T. Shiroka, A. Feiguin +10
The field-induced quantum phase transitions (QPT) of the spin ladder material Bi(Cu(1-x)Znx)2PO6 have been investigated via 31P nuclear magnetic resonance (NMR) on single-crystal s…