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Tuning the structure and superconductivity of SrNi2⁢P2 by Rh substitution

Journal Article · · Physical Review. B
 [1];  [2];  [3];  [4];  [1];  [2];  [1];  [4];  [1];  [1]
  1. Iowa State Univ., Ames, IA (United States); Ames Laboratory (AMES), Ames, IA (United States)
  2. Ames Laboratory (AMES), Ames, IA (United States); Iowa State Univ., Ames, IA (United States)
  3. Iowa State Univ., Ames, IA (United States)
  4. Univ. of Connecticut, Storrs, CT (United States)
+ Show Author Affiliations

The compound SrNi2⁢P2 is unique among the ThCr2⁢Si2 class since it exhibits a temperature-induced transition upon cooling from an uncollapsed tetragonal (ucT) state to a one-third-collapsed orthorhombic (tcO) state where one out of every three P-rows bond across the Sr layers. This compound is also known for exhibiting bulk superconductivity below 1.4 K at ambient pressure. Here, in this paper, we report on the effects of Rh substitution in Sr⁢(Ni1-x⁢Rhx)2⁢P2 on the structural and superconducting properties. We studied the variation of the nearest P-P distances as a function of the Rh fraction at room temperature, as well as its temperature dependence for selected compositions. We find that increasing the Rh fraction leads to a decrease in the transition temperature between the ucT and tcO states, until a full suppression of the tcO state for x ≥ 0.166. The superconducting transition first remains nearly insensitive to the Rh fraction, and then it increases to 2.3 K after the tcO state is fully suppressed. These results are summarized in a phase diagram, built upon the characterization by energy dispersive x-ray spectroscopy, x-ray diffraction, resistance, magnetization, and specific heat measurements done on crystalline samples with varying Rh content. The relationship between band structure, crystal structure, and superconductivity is discussed based on previously reported band structure calculations on SrRh2⁢P2. Moreover, the effect of Rh fraction on the stress-induced structural transitions is also addressed by means of strain-stress studies done by uniaxial compression of single-crystalline micropillars of Sr⁢(Ni1-x⁢Rhx)2⁢P2.

Research Organization:
Ames Laboratory (AMES), Ames, IA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division (MSE)
Grant/Contract Number:
AC02-07CH11358
OSTI ID:
2557994
Report Number(s):
AL-J--731
Journal Information:
Physical Review. B, Journal Name: Physical Review. B Journal Issue: 5 Vol. 111; ISSN 2469-9950
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English

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Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
BCS theory
crystal growth crystallography
density functional calculations
electrical conductivity
magnetization measurements
phase diagrams
resistivity measurements
specific heat measurements
structural phase transition
superconducting phase transition
superconductivity
superconductors
x-ray powder diffraction