Hydrogen in β-ZrNCl

Shamoto, S.; Iizawa, K.; Kato, Takemi; Yamada, Motoko; Yamanaka, Shōji; Ohoyama, Kenji; Ohashi, M.; Yamaguchi, Yasuo; Kajitani, Tsuyoshi

doi:10.1016/s0022-3697(99)00161-4

Cited by 16 publications

(13 citation statements)

References 5 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…From the slope above 1.5 V, the capacitance c EDL = n 2D e/V G of the EDL formed at the ZrNCl surface is estimated to be 9.2 µF/cm 2 , which is larger than that estimated for an electrolyte made of polyethylene oxide and KClO 4 [10]. At V G = 0 V, we observed a carrier density of n 2D = 3 × 10 13 cm -2 originate from of bulk carriers (corresponding to n 3D = 1.5 × 10 19 cm -3 ) due to chlorine deficiency or hydrogen intercalation formed during the growth of the single crystals [18,19]. By subtracting n 2D at V G = 0 V, we can obtain the net gate-tunable carrier density as n 2D = 2.2 × 10 14 cm -2 , which is larger than that reported for electrolytes [12] and covers the density range required for the insulator-metal transition in the phase diagram of bulk Li x ZrNCl.…”

Section: Field-induced Superconductivitycontrasting

confidence: 52%

Creating Novel Transport Properties in Electric Double Layer Field Effect Transistors Based on Layered Materials

Craciun

Koshino

et al. 2011

MRS Proc.

View full text Add to dashboard Cite

We present a study on the liquid/solid interface, which can be electrostatically doped to a high carrier density (n~10 14 cm -2 ) by electric-double-layer gating. Using micro-cleavage technique on the layered materials: ZrNCl and graphene, atomically flat channel surfaces can be easily prepared. Intrinsic high carrier density transport regime is accessed at the channel interface of electric double-layer field effect transistor, where novel transport properties are unveiled as the field-induced superconductivity on the ZrNCl with high transition temperature at 15 K, and accessing a high carrier density up to 2×10 14 cm -2 in graphene and its multi-layers. INTRODUCTIONTransport through ultra-thin layered materials is fruitfully manipulated by the field effect. Especially, at the low carrier density (n~10 12 cm -2 ) regime, it witnesses the exciting new physics originated from unusual chiral particles in graphene, an archetypal example in the layeredmaterial based transistors. Inspired by the material abundance, and richness variations in their properties on the carrier density, In this research, we aim at studying the transport properties in layered materials with extended carrier concentration, especially in the less explored higher density regime, utilizing the electrochemical principle of electric double layer formed at a liquid/solid interfaces.These liquid/solid interfaces are widely used in applications in catalytic activities and energy storage [1, 2], they are also important for the novel electronic functions in electric double layer transistors (EDLTs) exemplified by high performance organic electronics [3][4][5][6][7], fieldinduced electronic phase transitions [8][9][10][11], as well as superconductivity in SrTiO 3 [12]. Broadening EDLT to creating novel transport properties within other materials is highly demanded for enriching material science. However, it is severely hampered by inadequate choice of materials and processing techniques [13]. Whereas, in layered materials, special advantage exist as high quality surface could be easily prepared by cleavage. Here we introduce an effective method using ionic liquids as gate dielectrics, mechanical micro-cleavage techniques for surface preparation, and report the observation of field-induced superconductivity showing T c = 15.2 K on an atomically flat film of layered nitride compound, ZrNCl. And large amount of carriers could also be induced on other materials such as graphene and its multi-layers to a value of 2×10 14 using similar techniques. The present result reveals that the EDLT is an extremely versatile technique to induce electronic phase transitions by electrostatic charge accumulation

show abstract

Section: Field-induced Superconductivitycontrasting

confidence: 52%

Creating Novel Transport Properties in Electric Double Layer Field Effect Transistors Based on Layered Materials

Craciun

Koshino

et al. 2011

MRS Proc.

View full text Add to dashboard Cite

show abstract

“…8, left) indicating that the compound can probably be described as imide with a distance d(N--H) ¼ 101 pm similar to those found in K 2 [NH(SO 3 ) 2 ] (102 pm) [152]. For this semiconducting phase [36,37] with nearly the same colour as for the prototypic b-ZrNCl no superconductivity was observed [146]. Furthermore, it is assumed that hydrogen does not prevent superconductivity after electron-doping, because it is situated outside the [146].…”

Section: Structural Changesmentioning

confidence: 57%

“…(9) 172.724 (1) 165.815(6) 166.9 (1) 171 (1) 158 (1) 1: x for Li x TiNCl was not determined. [146], shows a similar distance evolution upon hydrogenation. Hydrogen occupies a site close to N (Fig.…”

Section: Structural Changesmentioning

confidence: 67%

“…For this semiconducting phase [36,37] with nearly the same colour as for the prototypic b-ZrNCl no superconductivity was observed [146]. Furthermore, it is assumed that hydrogen does not prevent superconductivity after electron-doping, because it is situated outside the [146]. However, a complete exclusion of such a phenomenon can not be maintained so far.…”

Section: Structural Changesmentioning

confidence: 87%

See 1 more Smart Citation

Superconducting nitride halides MNX (M = Ti, Zr, Hf; X = Cl, Br, I)

Schurz

Shlyk

Schleid

et al. 2011

Zeitschrift Für Kristallographie

View full text Add to dashboard Cite

Abstract. Two different polymorphs of the metal nitride halides MNX (M ¼ Ti, Zr, Hf; X ¼ Cl, Br, I) are known to crystallize in layered structures. The two crystal structures differ in the way 2 1 {X[M 2 N 2 ]X} slabs are stacked along the c-axes. Metal atoms and/or organic molecules can be intercalated into the van-der-Waals gap between these layers. After such an electron-doping via intercalation the prototypic band insulators change into superconductors with moderate high critical temperatures T c up to 25.5 K. This review gathers information on synthesis routes, structural characteristics and properties of the prototypic nitride halides and the derivatives after electron-doping with a focus on superconductivity.

show abstract

“…Since the Li cations occupy sites between the Cl anions, 6,22 a spatially separated intercalation layer is not formed; hence, Li 0.13 TiNCl does not possess the requisite two-layer interaction structure. The measured T C is therefore hypothesized to reflect the BCS superconductivity of an intergrowth phase or inclusions related to TiN which has T C = 5.6 K. This structural distinction also explains the absence of superconductivity in H x ZrNCl, 23 where in this case the H impurities occupy the 6c site between the Zr-N and the Cl ions and dope the type-I reservoir; since the type II reservoir is absent, high-T C superconductivity does not occur. Non-superconducting Li-doped α-phase HfNBr appears to be a similar case, in which localized spin paramagnetism is formed.…”

Section: Experimental T Cmentioning

confidence: 97%

Comment on “Superconductivity in electron-doped layered TiNCl with variable interlayer coupling”

Harshman

Fiory

2014

Phys. Rev. B

View full text Add to dashboard Cite

In their article, Zhang et al. [Phys. Rev. B 86, 024516 (2012)] present a remarkable result for A x (S) y TiNCl compounds (α-phase TiNCl partially intercalated with alkali A and optionally co-intercalated molecular species S), finding the superconducting transition temperature T C scales with d -1 , where the spacing d between TiNCl layered structures depends on intercalant thickness. Recognizing that this behavior indicates interlayer coupling, Zhang et al. cite, among other papers, the interlayer Coulombic pairing mechanism picture [Harshman et al., J. Phys.: Condens. Matter 23, 295701 (2011)]. This Comment shows that superconductivity occurs by interactions between the chlorine layers of the TiNCl structure and the layers containing A x , wherein the transverse A x -Cl separation distance ζ is smaller than d. In the absence of pair-breaking interactions, the optimal transition temperature is modeled by T C0 ∝ (σ/A) 1/2 ζ -1 , where σ/A is the fractional charge per area per formula unit. Particularly noteworthy are the rather marginally-metallic trends in resistivities of A x (S) y TiNCl, indicating high scattering rates, which are expected to partially originate from remote Coulomb scattering (RCS) from the A x ions. By modeling a small fraction of the RCS as inducing pair-breaking, taken to cut off exponentially with ζ, observations of T C < T C0 are quantitatively described for compounds with ζ < 4 Å, and T C ≈ T C0 for Na 0.16 (S) y TiNCl with propylene carbonate and butylene carbonate co-intercalants for which ζ > 7 Å. Since a spatially separated alkali-ion layer is not formed in Li 0.13 TiNCl, the observed T C of 5.9 K is attributed to an intergrowth phase related to TiN (T C = 5.6 K).

show abstract

Hydrogen in β-ZrNCl

Cited by 16 publications

References 5 publications

Creating Novel Transport Properties in Electric Double Layer Field Effect Transistors Based on Layered Materials

Creating Novel Transport Properties in Electric Double Layer Field Effect Transistors Based on Layered Materials

Superconducting nitride halides MNX (M = Ti, Zr, Hf; X = Cl, Br, I)

Comment on “Superconductivity in electron-doped layered TiNCl with variable interlayer coupling”

Contact Info

Product

Resources

About