30 Result(s)

Chapter

Oxygen in High-T_c Cuprate Superconductors

J. L. Tallon in Frontiers in Superconducting Materials (2005)

Article

Two Synthetic Routes to The Formation of Tungsten Oxide Hybrid Compounds

The syntheses of tungsten oxide-organic amine hybrids via homogenous and heterogeneous routes were explored and compared. In the former case, tungstic acid (H₂WO₄) and an appropriate amine were dissolved in ammon...

S.V. Chong, B. Ingham, J.L. Tallon in MRS Online Proceedings Library (2004)

Article

Pseudogap and Quantum-Transition Phenomenology in HTS Cuprates

The low-energy excitation spectrum of HTS cuprates is examined in the light of thermodynamic, transport, quasiparticle and spin properties. Changes in the thermodynamic spectrum associated with the normal-stat...

J. L. Tallon, J. W. Loram, C. Panagopoulos in Journal of Low Temperature Physics (2003)

Article

Critical Behavior in the Low-Energy Spin Fluctuations in High-T _c Superconductors

We study the spin fluctuations of pure and Zn-substituted La_{2 − x} Sr _x CuO₄ using the muon spin relaxation technique. Superconductivity is found to coexist with low-frequency spi...

C. Panagopoulos, J. L. Tallon, B. D. Rainford, T. **ang… in Journal of Superconductivity (2002)

Article

Magneto-Transport Properties of the Rutheno-Cuprate RuSr₂GdCu₂O₈

RuSr ₂ GdCu ₂ O ₈ (Ru-1212) is a triple perovskite containing both CuO ₂ ...

J.E. McCrone, J.R. Cooper, J.L. Tallon in Journal of Low Temperature Physics (1999)

Article

Systematics and Optimisation of Hole Do** in Bi-2223

We report systematic changes in thermopower, T _c , Raman modes and magnetic irreversibility H _irr as a function of carrier hole con...

D.M. Pooke, G.V.M. Williams, J.L. Tallon… in Journal of Low Temperature Physics (1999)

Article

Thermodynamic, transport and magnetic properties of the ferromagnetic superconductor RuSr₂GdCu₂O₈ and related compounds

The transport, magnetic and thermodynamic properties of RuSr ₂ GdCu ₂ O ₈ and related compounds are...

J.L. Tallon, C. Bernhard, J.W. Loram in Journal of Low Temperature Physics (1999)

Chapter and Conference Paper

Low Temperature Penetration Depth Measurements in High-T _c Superconductors

We review our experimental results of the low temperature (T) penetration depth of high-T _c superconductors. In clean high-T _c materials the in-plane penetration depth, λ _...

C. Panagopoulos, T. **ang, J. R. Cooper, J. L. Tallon in Advances in Superconductivity XI (1999)

Article

μSR measurement of the superconducting condensate reduction induced by Zn in underdoped, optimally doped and overdoped YBCO

We present an extensive study on the parallel reduction of T_c and the condensate density in ceramic YBCO samples, upon substitution of Cu by Zn. Strong evidence is collected in support of non magnetic pair breaki...

C. Bucci, R. De Renzi, G. Guidi, C. Bernhard, Ch. Niedermayer… in Hyperfine Interactions (1997)

Article

A muon‐spin‐rotation study of the superconducting condensate density in high temperature superconductors

Muon‐spin‐rotation studies on a variety of polycrystalline cuprate high‐T_ c superconductors reveal a generic dependence of the superconducting transition temperature T_ c upon condensate density throughout th...

Ch. Niedermayer, C. Bernhard, J.L. Tallon, G.V.M. Williams… in Hyperfine Interactions (1997)

Article

A new approach to the design of high-T_c superconductors: Metallised interlayers

We show from muon spin relaxation (μSR) studies on mercury HTS superconductors that a 50-fold increase in irreversibility field obtained by partial substitution of Re for Hg is due to metallisation of the Hg/R...

J. L. Tallon, C. Bernhard, Ch. Niedermayer… in Journal of Low Temperature Physics (1996)

Article

Electronic specific heat of overdoped Tl₂Ba₂CuO_6+δ in a magnetic field

We have measured the magnetic field dependence of the electronic specific heat γ^el (=C^el/T) of polycrystalline Tl₂Ba₂CuO_6+δ from 8 K to above T_c, for samples with T_c = 24 K to 72 K using a high resolution, differ...

J. W. Radcliffe, J. W. Loram, J. M. Wade, G. Wltschek… in Journal of Low Temperature Physics (1996)

Chapter and Conference Paper

Dimensionality Transition of the Vortex State in Bi₂Sr₂CaCu₂O_8+δ

The second peak effect in the magnetisation of Bi₂Sr₂CaCu₂O_8+δ has been investigated for both under-, near optimally-, and over-doped single crystals. The size and position of the peak depend strongly on the dopi...

D. M. Pooke, C. Bernhard, Y. Kotaka, J. L. Tallon… in Advances in Superconductivity VIII (1996)

Article

Magnetic penetration depths of (BiPb)-2212 and (TlPb)-1212 — Universal correlations revisited

A systematic study of the dependence of the critical temperature on the superconducting carrier density, as measured byμ ⁺SR, was carried out for a variety of cuprate oxides. We have shown that substitution of Pb...

E. J. Ansaldo, J. J. Boyle, C. Niedermayer, H. Glückler… in Hyperfine Interactions (1994)

Article

Electronic specific heat of Tl₂Ba₂CuO_6+δ from 2 K to 300 K for 0≤δ≤0.1

Using a high-precision differential technique with a resolution of 1∶10⁴, we have measured the heat capacity of Tl₂Ba₂CuO_6+δ over a temperature range 2–300 K for 0≤δ≤0.1. Anomalies atT _{c ...}

J. M. Wade, J. W. Loram, K. A. Mirza, J. R. Cooper… in Journal of Superconductivity (1994)

Article

Pair density and gaplessness in high-T _c cuprates

The results ofμSR and heat capacity studies on high-T _c superconducting cuprates, particularly in the overdoped regime, are presented, and it is shown that the pair density fal...

J. L. Tallon, J. W. Loram in Journal of Superconductivity (1994)