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Linear-in-temperature resistivity for optimally superconducting (Nd,Sr)NiO2

Journal Article · · Nature (London)
 [1];  [2];  [2];  [3];  [2];  [2];  [2];  [2];  [2];  [4];  [2];  [3];  [2]
  1. SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States). Stanford Institute for Materials and Energy Science (SIMES); Stanford Univ., CA (United States); SLAC
  2. SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States). Stanford Institute for Materials and Energy Science (SIMES); Stanford Univ., CA (United States)
  3. Cornell Univ., Ithaca, NY (United States)
  4. Stanford Univ., CA (United States)
+ Show Author Affiliations

The occurrence of superconductivity in proximity to various strongly correlated phases of matter has drawn extensive focus on their normal state properties, to develop an understanding of the state from which superconductivity emerges. The recent finding of superconductivity in layered nickelates raises similar interests. However, transport measurements of doped infinite-layer nickelate thin films have been hampered by materials limitations of these metastable compounds: in particular, a high density of extended defects. Here, by moving to a substrate (LaAlO3)0.3(Sr2TaAlO6)0.7 that better stabilizes the growth and reduction conditions, we can synthesize the doping series of Nd1–xSrxNiO2 essentially free from extended defects. In their absence, the normal state resistivity shows a low-temperature upturn in the underdoped regime, linear behaviour near optimal doping and quadratic temperature dependence for overdoping. This is phenomenologically similar to the copper oxides despite key distinctions—namely, the absence of an insulating parent compound, multiband electronic structure and a Mott–Hubbard orbital alignment rather than the charge-transfer insulator of the copper oxides. In this study, we further observe an enhancement of superconductivity, both in terms of transition temperature and range of doping. These results indicate a convergence in the electronic properties of both superconducting families as the scale of disorder in the nickelates is reduced.

Research Organization:
SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division (MSE); US Air Force Office of Scientific Research (AFOSR); National Science Foundation (NSF)
Grant/Contract Number:
AC02-76SF00515
OSTI ID:
2000692
Alternate ID(s):
OSTI ID: 2309750
Journal Information:
Nature (London), Journal Name: Nature (London) Vol. 619; ISSN 0028-0836
Publisher:
Nature Publishing GroupCopyright Statement
Country of Publication:
United States
Language:
English

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Figures / Tables (25)

Extended Data Table 1(p. 13)figure Extended Data Table 1
Extended Data Table 2(p. 13)figure Extended Data Table 2
Fig. 1(p. 16)figure Fig. 1
Fig. 2(p. 17)figure Fig. 2
Fig. 3(p. 18)figure Fig. 3
Fig. 4(p. 19)figure Fig. 4
Extended Data Fig. 1(p. 20)figure Extended Data Fig. 1
Extended Data Fig. 2(p. 21)figure Extended Data Fig. 2
Extended Data Fig. 3(p. 22)figure Extended Data Fig. 3
Extended Data Fig. 4(p. 23)figure Extended Data Fig. 4
Extended Data Fig. 5(p. 24)figure Extended Data Fig. 5
Extended Data Fig. 6(p. 25)figure Extended Data Fig. 6
Extended Data Fig. 7(p. 26)figure Extended Data Fig. 7
Extended Data Fig. 8(p. 27)figure Extended Data Fig. 8
Extended Data Fig. 9(p. 28)figure Extended Data Fig. 9
Extended Data Fig. 10(p. 29)figure Extended Data Fig. 10
Extended Data Fig. 11(p. 30)figure Extended Data Fig. 11
Fig. S1(p. 32)figure Fig. S1
Fig. S2(p. 33)figure Fig. S2
Table S1(p. 33)table Table S1
Fig. S3(p. 34)figure Fig. S3
Fig. S4(p. 35)figure Fig. S4
Fig. S5(p. 37)figure Fig. S5
Table S2(p. 37)table Table S2
Table S3(p. 39)table Table S3

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