153 citations · 1.3k across the 59 of their papers we have counts for
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Nanoscale lattice heterostructure in high Tc superconductors
Annette Bussmann-Holder, Jürgen Haase, Hugo Keller +9
Low temperature superconductivity was known since 1957 to be described by BCS theory for an effective single band metals controlled by the density of states at the Fermi level, ver…
Oxygen isotope effect on the superfluid density within the wave and wave pairing channels of YBaCuO
Rustem Khasanov, Alexander Shengelaya, Kazimierz Conder +3
We report on measurements of the oxygen isotope (O/O) effect (OIE) on the transition temperature and the zero-temperature in-plane magnetic penetration de…
K. Alex Müller: Science between ferroelectricity and superconductivity
R. K. Kremer, A. Bussmann-Holder, H. Keller
K. Alex Müller started his scientific career in 1958 when he was about thirty-one years old. After his wife passed away and being in his nineties, his interest in physics gradually…
K. Alex Müller and his important role in ferroelectricity
Annette Bussmann-Holder, Hugo Keller
In this review we concentrate on the work of K. Alex Müller in connection with his activities on oxide perovskites and ferroelectrics which were central to his research career long…
Filamentary superconductivity of resistively-switched strontium titanate
K. Szot, C. Rodenbücher, K. Rogacki +7
SrTiO, although a wide gap insulator, has long been known to become metallic and superconducting at extremely low doping levels. This has given rise to questions concerning the…
Multi-Band Superconductivity and the Steep Band -- Flat Band Scenario
Annette Bussmann-Holder, Hugo Keller, Arndt Simon +1
The basic features of multi-band superconductivity and its implications are derived. In particular, it is shown that enhancements of the superconducting transition temperature take…
High-temperature superconductors: underlying physics and applications
Annette Bussmann-Holder, Hugo Keller
Superconductivity was discovered in 1911 by Kamerlingh Onnes and Holst in mercury at the temperature of liquid helium (4.2 K). It took almost 50 years until in 1957 a microscopic t…
The road map toward room temperature superconductivity: manipulating different pairing channels in systems composed of multiple electronic components
Annette Bussmann-Holder, Jurgen Kohler, Arndt Simon +3
While it is known that the amplification of the superconducting critical temperature Tc is possible in a system of multiple electronic components in comparison with a single compon…
Evidence for strong lattice effects as revealed from huge unconventional oxygen isotope effects on the pseudogap temperature in LaSrCuO
M. Bendele, F. von Rohr, Z. Guguchia +6
The oxygen isotope (O/O) effect (OIE) on the pseudogap (charge-stripe ordering) temperature is investigated for the cuprate superconductor LaSr$_{x…
High temperature superconductivity in sulfur hydride under ultrahigh pressure: A complex superconducting phase beyond conventional BCS
Annette Bussmann-Holder, Jurgen Kohler, M. -H. Whangbo +2
The recent report of superconductivity under high pressure at the record transition temperature of Tc=203K in sulfur hydride has been identified as conventional in view of the obse…
Structure and Composition of the 200 K-Superconducting Phase of H2S under Ultrahigh Pressure: The Perovskite (SH-)(H3S+)
Elijah E. Gordon§, Ke Xu§, Hongjun Xiang +5
H2S is converted under ultrahigh pressure (> 110 GPa) to a metallic phase that becomes superconducting with a record Tc of 200 K. It has been proposed that the superconducting phas…
Oxygen Isotope Effects on Lattice Properties of La_{2-x}Ba_xCuO_4 (x = 1/8)
Z. Guguchia, D. Sheptyakov, E. Pomjakushina +6
A novel negative oxygen-isotope (16O/18O) effect (OIE) on the low-temperature tetragonal phase transition temperature T_{LTT} was observed in La_{2-x}Ba_xCuO_4 (x = 1/8) using high…
The route to high temperature superconductivity in transition metal oxides
Annette Bussmann-Holder, K. Alex Müller
The discovery of high temperature superconductivity in cuprates was possible only through an intimate knowledge of perovskite oxides which have been synthesized and characterized f…
Comment on "Isotope effect in multi-band and multi-channel attractive systems and inverse isotope effect in iron-based superconductors" by T. Yanagisawa, et al
Annette Bussmann-Holder, Hugo Keller
In a recent paper Yanagisawa et al. [1] claim from a theoretical analysis of a multi-channel multi-band superconductor model that an inverse isotope exponent on the superconducting…
Intrinsic and structural isotope effects in Fe-based superconductors
R. Khasanov, M. Bendele, A. Bussmann-Holder +1
The currently available results of the isotope effect on the superconducting transition temperature T_c in Fe-based high-temperature superconductors (HTS) are highly controversial.…
Field Dependent Superfluid Density in the Optimally Doped SmFeAsO_(1-x)F_y Superconductor
S. Weyeneth, M. Bendele, R. Puzniak +9
The magnetic field dependence of the in-plane magnetic penetration depth for optimally doped SmFeAsO_(1-x)F_y was investigated by combining torque magnetometry, SQUID magnetometry,…
Unconventional dynamical covalency driven superconductivity in Nb doped SrTiO3
A. Bussmann-Holder, A. R. Bishop, A. Simon
Nb doped SrTiO3, the first discovered two-gap superconductor, is shown to be the most unconventional one of the known multiband superconductors, since the smaller of the two superc…
Comment on: Superfluid density and specific heat within a self-consistent scheme for a two-band superconductor
Annette Bussmann-Holder
Kogan et al. [Phys. Rev. B 80, 014507 (2009)] present a two-band model to investigate its effect on superconducting properties as, e.g., the superfluid density, the specific heat,…
Superconductivity in Fe and As based compounds: a bridge between MgB2 and cuprates
A. Bussmann-Holder, A. Simon, H. Keller +1
By interpreting various experimental data for the new high temperature FeAs type superconductors in terms of lattice mediated multi gap superconductivity, it is shown that these sy…
Identifying the pairing mechanism in Fe-As based superconductors: gaps and isotope effects
A. Bussmann-Holder, A. Simon, H. Keller +1
The temperature dependencies of the coupled superconducting gaps, observed in Fe-As based superconducting compounds is calculated and a universal temperature scaling observed which…
Polaron Coherence as Origin of the Pseudogap Phase in High Temperature Superconducting Cuprates
A. Bussmann-Holder, H. Keller, A. R. Bishop +2
Within a two component approach to high Tc copper oxides including polaronic couplings, we identify the pseudogap phase as the onset of polaron ordering. This ordering persists in…
Oxygen-isotope effect on the superconducting gap in the cuprate superconductor Y_{1-x}Pr_xBa_2Cu_3O_{7-δ}
R. Khasanov, S. Strässle, K. Conder +3
The oxygen-isotope (^{16}O/^{18}O) effect (OIE) on the zero-temperature superconducting energy gap Δ_0 was studied for a series of Y_{1-x}Pr_xBa_2Cu_3O_{7-δ} samples (0.0\leq x\leq…
Universal observation of multiple order parameters in cuprate superconductors
R. Khasanov, S. Strässle, D. Di Castro +5
The temperature dependence of the London penetration depth λwas measured for an untwined single crystal of YBa_2Cu_3O_{7-δ} along the three principal crystallographic directions (a…
s-wave symmetry along the c-axis and s+d in-plane superconductivity in bulk YBa_2Cu_4O_8
R. Khasanov, A. Shengelaya, A. Bussmann-Holder +3
To clarify the order parameter symmetry of cuprates, the magnetic penetration depth was measured along the crystallographic directions , , and in single crystals of Y…