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 Selected Publications

2019

Layered CeSO and LiCeSO Oxide Chalcogenides Obtained via Topotactic Oxidative and Reductive Transformations S. J. Cassidy, M. J. Pitcher, J. J. K. Lim, J. Hadermann, J. P. Allen, G. W. Watson, S. Britto, E. J. Chong, D. G. Free, C. P. Grey, and S. J. Clarke,  Inorg. Chem. 58 3838-3850 (2019).

2018

Synthesis, structure and properties of the layered oxide chalcogenides Sr2CuO2Cu2S2 and Sr2CuO2Cu2Se2 J. N. Blandy, C. F. Smura, S. Liu, S. J. Cassidy, D. N. Woodruff, J. E. McGrady, S. J. Clarke,  Inorg. Chem. 57 15379-15388 (2018).

Magnetic ordering in the layered oxyselenides Sr2CoO2Ag2Se2 and Ba2CoO2Ag2Se2 S. J. C. Herkelrath, J. N. Blandy, S. J. Clarke,  J. Solid State Chem. 264 119-123 (2018).

Complex magnetic ordering in the oxide selenide Sr2Fe3Se2O3S S. J. Cassidy, F. Orlandi, P. Manuel, J. Hadermann, A. Scrimshire, P. A. Bingham and S. J. Clarke,  Inorg. Chem. 57 10312-10322 (2018).

2017

Suppression of electronic correlations by chemical pressure from FeSe to FeS P. Reiss, M. D. Watson, T. K. Kim, A. A. Haghighirad, D. N. Woodruff, M. Bruma, S. J. Clarke, A. I. Coldea,  Phys. Rev. B 96 121103(R) (2017).

Coexistence of magnetism and superconductivity in separate layers of the iron-based superconductor Li1-xFex(OH)Fe1-ySe C V Topping, F K K Kirschner, S J Blundell, P J Baker, D N Woodruff, F Schild, H Sun, S J Clarke,  Phys. Rev. B 95 134419(2017).

Synthesis and magnetic structure of the layered manganese oxide selenide Sr2MnO2Ag1.5Se2. J N Blandy, J C Boskovic, S J Clarke,  J. Solid State Chem. 245 61-66 (2017).

2016

Robustness of superconductivity to competing magnetic phases in tetragonal FeS. F K K Kirschner, F Lang, C V Topping, P J Baker, F L Pratt, S E Wright, D N Woodruff, S J Clarke, S J Blundell,  Phys. Rev. B 94 134509 (2016).

Spin resonance in the superconducting state of Li1-xFexODFe1-ySe observed by neutron spectroscopy. N R Davies, M C Rahn, H C Walker, R A Ewings, D N Woodruff, S J Clarke, A T Boothroyd,  Phys. Rev. B 94 144503 (2016).

Complex Microstructure and Magnetism in Polymorphic CaFeSeO. S J Cassidy, M Batuk, D Batuk, J Hadermann, D N Woodruff, A L Thompson, S J Clarke,  Inorg. Chem. 55 10714-10726 (2016).

The Parent Li(OH)FeSe Phase of Lithium Iron Hydroxide Selenide Superconductors. D N Woodruff, F Schild, C V Topping, S J Cassidy, J N Blandy, S J Blundell, A L Thompson, S J Clarke,  Inorg. Chem. 55 9886–9891 (2016).

2015

Robustness of superconductivity to structural disorder in Sr0.3(NH2)y(NH3)1-yFe2Se2. F R Foronda, S Ghannadzadeh, S J Sedlmaier, J D Wright, K Burns, S J Cassidy, P A Goddard, T Lancaster, S J Clarke, S J Blundell,  Phys. Rev. B 92 134517 (2015).

Soft chemical control of the crystal and magnetic structure of a layered mixed valent manganite oxide sulfide. J N Blandy, A M Abakumov, K E Christensen, J Hadermann, P Adamson, S J Cassidy, S Ramos, D G Free, H Cohen, D N Woodruff, A L Thompson and S J Clarke,  APL Materials 3 041520 (2015).

Strong (pi; 0) spin Fluctuations in beta-FeSe observed by neutron spectroscopy. M C Rahn, R A Ewings, S J Sedlmaier, S J Clarke, and A T Boothroyd  Phys. Rev. B 91 180501(R) (2015).

Controlling parameters for superconductivity in layered lithium iron hydroxide selenides. H Sun, D N Woodruff, S J Cassidy, G M Allcroft, S J Sedlmaier, A L Thompson, P A Bingham, S D Forder, S Cartenet, N Mary, S Ramos, F R Foronda, B H Williams, X. Li, S J Blundell, S J Clarke,  Inorg. Chem. 54 1958–1964 (2015).

2014

Ammonia-Rich High-Temperature Superconducting Intercalates of Iron Selenide Revealed through Time-Resolved in Situ X-ray and Neutron Diffraction. S J Sedlmaier, S J Cassidy, R G Morris, M Drakopoulos, C Reinhard, S J Moorhouse, D O’Hare, P Manuel, D Khalyavin, S J Clarke,  J. Am. Chem. Soc. 136, 630-633 (2014).

Control of the superconducting properties of Sr2-xCaxVO3FeAs through isovalent substitution. A J Corkett, D G Free, S J Cassidy, S Ramos, S J Clarke, J. Solid State Chem. 216,  91-98 (2014).

Local structure of sodium- and iron-deintercalated NaFeAs S J Cassidy, S. Ramos, S J Clarke, Z. Anorg. Allg. Chem. 640, 2889–2896,   (2014).

 

2013

Enhancement of the superconducting transition temperature of FeSe by intercalation of a molecular spacer layer. M Burrard-Lucas, D G Free, S J Sedlmaier, J D Wright, S J  Cassidy, Y Hara, A J Corkett, T Lancaster, P J Baker, S J Blundell, S J Clarke,  Nature Materials 12, 15-19, (2013).

Magnetic fluctuations and spin freezing in nonsuperconducting LiFeAs derivatives J D Wright, M J Pitcher, W Trevelyan-Thomas, T Lancaster, P J Baker, F L Pratt, S J Clarke, and S J Blundell, Phys. Rev. B 88,  060401(R) (2013).

Spin fluctuations away from (π,0) in the superconducting phase of molecular-intercalated FeSe A E Taylor, S J Sedlmaier, S J Cassidy, E A Goremychkin, R A  Ewings,  T G Perring, S J Clarke, A T Boothroyd, Phys. Rev. B 87,  220508(R), (2013).

 

2012

Sr2Mn2O4Se: A New Oxychalcogenide with Antiferromagnetic Chains D G Free, S J Herkelrath, S J Clarke,  Z. Anorg. Allg. Chem. 638, 2532–2537 (2012).

Competing magnetic structures and the evolution of copper ion/vacancy ordering with composition in the manganite oxide chalcogenides Sr2MnO2Cu1.5(S1−xSex)2    P Adamson, J Hadermann, C F Smura, O J Rutt, G Hyett, D G Free, S J Clarke, Chem. Mater. 24, 2802–2816. (2012)  10.1021/cm301486v

The gradual destruction of magnetism in the superconducting family NaFe1−xCoxAs. J D Wright, T Lancaster, I Franke, A J Steele, J S Möller, M J Pitcher, A J Corkett, D G Free, D R Parker, F L Pratt, P J  Baker, S J Clarke, and S J Blundell, Physical Review B  85, 054503 (2012).

2011

Antiferromagnetic spin fluctuations in LiFeAs observed by neutron scattering. A E Taylor, M J Pitcher, R A Ewings, T G Perring, S J Clarke and A T Boothroyd,  Physical Review B  83, 220514(R) (2011).

High spin cobalt(II) ions in square planar coordination: structures and magnetism of the oxysulfides Sr2CoO2Cu2S2, Ba2CoO2Cu2S2 and their solid solution. C F Smura, D R Parker, M Zbiri, M R Johnson, Z A Gál, and S J Clarke,  Journal of the American Chemical Society 133, 2691 (2011).

Structure, magnetism and superconductivity of the layered iron arsenides Sr1−xNaxFe2As2. R Cortes-Gil and S J Clarke, Chemistry of Materials 23, 1009 (2011).  

2010

Compositional control of the superconducting properties of LiFeAs M J Pitcher, T Lancaster, J D Wright, I Franke, A J Steele, P J Baker, F L Pratt, W Trevelyan Thomas, D R Parker, S J Blundell and S J Clarke, Journal of the American Chemical Society 132, 10467 (2010).

The indifference of superconductivity and magnetism to size-mismatched cations in the layered iron arsenides Ba1-xNaxFe2As2 R Cortes-Gil, D R Parker, M J Pitcher, J Hadermann and S J Clarke, Chemistry of Materials 22, 4304 (2010).

Control via electron count of the competition between magnetism and superconductivity in cobalt-doped and nickel-doped NaFeAs D R Parker, M J P Smith, T Lancaster, A J Steele, I Franke, P J Baker, F L Pratt, M J Pitcher, S J Blundell and S J Clarke Physical Review Letters 104 057007 (2010).

2009

Stoichiometric CeOCuS – a well-behaved Ce(III) layered oxysulfide M J Pitcher, C F Smura and S J Clarke, Inorganic Chemistry 130 14426 (2009). Download

Structure, antiferromagnetism and superconductivity of the layered iron arsenide NaFeAs D R Parker, M J Pitcher, P J Baker, I Franke, T Lancaster, S J Blundell and S J Clarke, Chemical Communications 2189 (2009). Download

Response of superconductivity and crystal structure of LiFeAs to hydrostatic pressure M Mito, M J Pitcher, W Crichton, G Garbarino, P J Baker, S J Blundell, P Adamson, D R Parker and S J Clarke, Journal of the American Chemical Society 131 2986 (2009). Download

Enhancement of Superfluid Stiffness, Suppression of Superconducting Tc and Field-induced Magnetism in the Pnictide Superconductor LiFeAs F L Pratt, P J Baker, S J Blundell, T Lancaster, H J Lewtas, P Adamson, M J Pitcher, D R Parker and S J Clarke Physical Review B 79 052508 (2009). Download

2008

High-energy spin excitations in BaFe2As2 observed by inelastic neutron scattering R A Ewings, T G Perring, R I Bewley, M J Pitcher, D R Parker, S J Clarke and A T Boothroyd, Physical Review B 78 220501 (2008). Download

Fragmentation of an infinite ZnO2 square plane into discrete [ZnO2]2− linear units in the oxyselenide Ba2ZnO2Ag2Se2 S J C Herkelrath, I Saratovsky, J Hadermann, and S J Clarke, Journal of the American Chemical Society 130 14426 (2008). Download

Structure and superconductivity of LiFeAs M J Pitcher, D R Parker, P Adamson, S J C Herkelrath, A T Boothroyd, R M Ibberson, M Brunelli and S J Clarke, Chemical Communications 5918 (2008). Download

Structures, physical properties and chemistry of layered oxychalcogenides and oxypnictides. S J Clarke, P Adamson, S J C Herkelrath, O J Rutt, D R Parker, M J Pitcher and C F Smura, Inorganic Chemistry 47 8473 (2008).  Download

Ba2Mn2O4Cu0.9S – a layered oxysulfide with a new perovskite-related manganese oxide fragment. G Hyett, Z A Gál, C F Smura and S J Clarke, Chemistry of Materials 20 559 (2008).  Download

2007

Topotactic oxidative and reductive control of the structures and properties of layered manganese oxychalcogenides G Hyett, N Barrier, S J Clarke and J Hadermann Journal of the American Chemical Society 129 11192 (2007). Download

Cation defective layered Ruddlesden-Popper-related oxysulfides La2LnMS2O5 (Ln = La, Y; M = Nb, Ta) L Cario, A Florin Popa, A Lafond, C Guillot-Deudon, H Kabbour, A Meerschaut, S J Clarke and P Adamson Inorganic Chemistry 46, 9584 (2007). Download

Structure and physical properties of the polar oxysulfide CaZnOS T Sambrook, C F Smura, S J Clarke, K M Ok and P S Halasyamani Inorganic Chemistry 46 2571 (2007). Download

2001-2006

Layered Oxysulfides Sr2MnO2Cu2m-0.5Sm+1 (m = 1, 2, and 3) as Insertion Hosts for Li Ion Batteries S Indris, J Cabana, O J Rutt, S J Clarke and C P Grey Journal of the American Chemical Society 128 13354 (2006). Download

Reversible lithium insertion and copper extrusion in layered oxysulfides O J Rutt, G R.Williams and S J Clarke Chemical Communications 2869 (2006). Download

Structural Chemistry and Metamagnetism of an Homologous Series of Layered Manganese Oxysulfides Z A Gál, O J Rutt, C F Smura, T P Overton, N Barrier, S J Clarke and J Hadermann Journal of the American Chemical Society 128 8530 (2006). Download

Vertex-Linked ZnO2S2 Tetrahedra in the Oxysulfide BaZnOS: a New Coordination Environment for Zinc in a Condensed Solid S Broadley, Z A Gál, F Corŕ, C F Smura, and S J Clarke Inorganic Chemistry 44 9092 (2005). Download

Synthesis and Structure of Alkaline Earth Silicon Nitrides: BaSiN2, SrSiN2 and CaSiN2 Z A Gál, P M Mallinson, H J Orchard and S J Clarke Inorganic Chemistry 43 3998 (2004). Download

The first ternary tin (II) nitride: NaSnN N S P Watney, Z A Gál, M D S Webster and S J Clarke Chemical Communications 4190 - 4192 (2005). Download

Electronically-driven structural distortions in lithium intercalates of the n = 2 Ruddlesden-Popper type host Y2Ti2O5S2: synthesis, structure and properties of LixY2Ti2O5S2 (0 < x < 2) G Hyett, O J Rutt, Z A Gál, S G Denis, M A Hayward and S J Clarke, Journal of the American Chemical Society 126 1980-1991 (2004). Download

Sodium intercalation into the n = 2 Ruddlesden-Popper type host Y2Ti2O5S2: synthesis, structure and properties of a-NaxY2Ti2O5S2 (0 < x < 1) S J Clarke, S G Denis, O J Rutt, T L Hill, M A Hayward, G Hyett and Z A Gál. Chemistry of Materials 15 5065 (2003). Download

The cation-deficient Ruddlesden-Popper oxysulfide Y2Ti2O5S2 as a layered sulfide – topotactic potassium intercalation to form KY2Ti2O5S2 O J Rutt, T L Hill, Z A Gál, M A Hayward and S J Clarke, Inorganic Chemistry 42 7906-7911 (2003). Download

Zr4O5N2 - intergrowth of fluorite and bixbyite anion layers formed by coupled site-selective anion and vacancy ordering. C W Michie, J B Claridge, S J Clarke and M J Rosseinsky Chemistry of Materials 15 1547 (2003). Download

A novel layered oxysulfide intergrowth compound Sr4Mn2Cu5O4S5 containing a fragment of the a-Cu2S antifluorite structure. N Barrier and S J Clarke Chemical Communications 164 (2003). Download

A first transition series pseudo-tetrahedral oxynitride anion – the synthesis and characterisation of Ba2VO3N S J Clarke, P R Chalker, J Holman, C W Michie, M Puyet, and M J Rosseinsky Journal of the American Chemical Society 124 3337 (2002). Download

Oxynitride perovskites: synthesis and structures of LaZrO2N, NdTiO2N and LaTiO2N, and comparison with oxide perovskites  S J Clarke, B P Guinot, C W Michie, M J C Calmont, and M J Rosseinsky Chemistry of Materials 14 288 (2002). Download

Two alternative products from the intercalation of alkali metals into cation-defective Ruddlesden-Popper oxysulfides S G Denis and S J Clarke Chemical Communications 2356 (2001). Download


Publication archive

High temperature synthesis and structures of perovskite and n = 1 Ruddlesden-Popper tantalum oxynitrides. S J Clarke, K A Hardstone, C W Michie and M J Rosseinsky Chemistry of Materials 14 2664 (2002)

New Calcium Germanium Nitrides: Ca2GeN2, Ca4GeN4 and Ca5Ge2N6. S J Clarke and F J DiSalvo Inorganic Chemistry 39 2631 (2000)

New zirconium titanium oxynitrides obtained by ammonolysis of zirconium titanate. S J Clarke, C W Michie and M J Rosseinsky Chemistry of Materials 12 863 (2000)

Characterisation of spin-waves in copper(II) deuteroformate tetradeuterate: a square S = ½ Heisenberg antiferromagnet. S J Clarke, A Harrison, T E Mason and D Visser Solid State Communications 112 561 (1999).

Structure of Zr2ON2 by neutron powder diffraction: the absence of nitride-oxide ordering. S J Clarke, C W Michie and M J Rosseinsky Journal of Solid State Chemistry 146 399 (1999).

Exciton binding energies and band gaps in GaN bulk crystals. K Reimann, M Steube, D. Frohlich, S J Clarke Journal of Crystal Growth 190 652 (1998).

Synthesis and Structure of b-Ca3Ga2N4, a ternary nitride with two interpenetrating nets. S J Clarke and F J DiSalvo Journal of Alloys Compounds 274 118 (1998)

Synthesis, Structure and Magnetic Properties of NaTiO2. S J Clarke, A J Fowkes, A Harrison, R M Ibberson and M J Rosseinsky Chemistry of Materials 10 372 (1998)

A new conducting ternary nitride: NaxTa3N5 (0≤ x ≤1.4) S J Clarke and F J DiSalvo Journal of Solid State Chemistry 132 394 (1997)

Two-photon spectroscopy in GaN.  M Steube, K. Reimann, D Frohlich, S J Clarke Materials Science and Engineering B-Solid State Materials for Advanced Technology 50 188 (1997).

Free excitons with n = 2 in bulk GaN M Steube, K Reimann, D Fröhlich and S J Clarke Applied Physics Letters 71 948 (1997)

Synthesis and structure of the subnitrides Ba2GeGaN and (BaxSr1-x)3Ge2N2 (x » 0.7). S J Clarke and F J DiSalvo Journal of Alloys and Compounds 259 158 (1997)

Preparation of GaN single crystals using a Na flux. H Yamane, M Shimada, S J Clarke and F J DiSalvo Chemistry of Materials 9 413 (1997)

Synthesis and structure of one, two and three dimensional alkaline earth gallium nitrides: Sr3Ga2N4, Ca3Ga2N4 and Sr3Ga3N5. S J Clarke and F J DiSalvo Inorganic Chemistry 36 1143 (1997)

Solid solutions between LaN and Ca3N2: defect rock-salt nitrides La1-xCaxN1-x/3. S J Clarke and F J DiSalvo Journal of Solid State Chemistry 129 144 (1997)

Ternary nitrides: a rapidly growing class of new materials. F J DiSalvo and S J Clarke Current Opinion in Solid State and Materials Science 1 241 (1996)

Synthesis and structure of two new strontium germanium nitrides: Sr3Ge2N2 and Sr2GeN2. S J Clarke, G R Kowach and F J DiSalvo Inorganic Chemistry 35 7009 (1996)

Single phase Na1.0TiO2: solid state synthesis and high resolution powder diffraction characterisation. S J Clarke, A C Duggan, A J Fowkes, A Harrison, R M Ibberson and M J Rosseinsky Chemical Communications 409 (1996)

Effect of diamagnetic dilution on the S=1/2 square Heisenberg antiferromagnet. S J Clarke and A Harrison Journal of Magnetism and Magnetic Materials 140-144 1627 (1995)

Magnetism ( A review of 1992). A Harrison and S J Clarke Annual Reports of the Royal Society of Chemistry 1993 89A 425 (1993)

The structure of CF3I. S J Clarke, J K Cockcroft and A N Fitch Zeitschrift für Kristallographie 206 87 (1993)

Dispersion of spin-waves in the S=1/2 square Heisenberg antiferromagnet Cu(DCO2)2.4D2O. A Harrison, S J Clarke, T E Mason and D Visser Journal of Magnetism and Magnetic Materials 104-107 557 (1992)

An ESR study of the diamagnetically doped S=1/2 square Heisenberg antiferromagnets Cu1-xMgx(HCO2)2.4H2O and Cu1-xZnx(HCO2)2.4H2O. S J Clarke and A Harrison, Journal of Physics: Condensed Matter 4 6217 (1992)

Magnetic ordering and fluctuations in the S=1/2 square Heisenberg antiferromagnet Cu(DCO2)2.4D2O. S J Clarke, A Harrison, T E Mason, G J McIntyre and D Visser Journal of Physics: Condensed Matter 4 L71 (1992)