Collapsed tetragonal phase transition in LaRu2P2

Drachuck, Gil; Sapkota, Aashish; Jayasekara, Wageesha T.; Kothapalli, Karunakar; Bud'ko, Sergey L.; Goldman, Alan I.; Kreyssig, Andreas; Canfield, Paul C.

doi:10.1103/PhysRevB.96.184509

Collapsed tetragonal phase transition in ${LaRu}_{2} P_{2}$

Journal Article · Fri Nov 10 00:00:00 EST 2017 · Physical Review B

DOI:https://doi.org/10.1103/PhysRevB.96.184509· OSTI ID:1410346

Drachuck, Gil ^[1]; Sapkota, Aashish ^[1]; Jayasekara, Wageesha T. ^[1]; Kothapalli, Karunakar ^[1]; Bud'ko, Sergey L. ^[1]; Goldman, Alan I. ^[1]; Kreyssig, Andreas ^[1]; Canfield, Paul C. ^[1]

Ames Lab. and Iowa State Univ., Ames, IA (United States)

Here, the structural properties of LaRu₂P₂ under external pressure have been studied up to 14 GPa, employing high-energy x-ray diffraction in a diamond-anvil pressure cell. At ambient conditions, LaRu₂P₂ (I4/mmm) has a tetragonal structure with a bulk modulus of B = 105(2) GPa and exhibits superconductivity at T_c = 4.1 K. With the application of pressure, LaRu₂P₂ undergoes a phase transition to a collapsed tetragonal (cT) state with a bulk modulus of B = 175(5) GPa. At the transition, the c-lattice parameter exhibits a sharp decrease with a concurrent increase of the a-lattice parameter. The cT phase transition in LaRu₂P₂ is consistent with a second-order transition, and was found to be temperature dependent, increasing from P = 3.9(3) GPa at 160 K to P = 4.6(3) GPa at 300 K. In total, our data are consistent with the cT transition being near, but slightly above 2 GPa at 5 K where superconductivity is suppressed. Finally, we compare the effect of physical and chemical pressure in the RRu₂P₂ (R = Y, La–Er, Yb) isostructural series of compounds and find them to be analogous.

View Accepted Manuscript (DOE)

Research Organization:: Ames Laboratory (AMES), Ames, IA (United States)

Sponsoring Organization:: USDOE

Grant/Contract Number:: AC02-06CH11357; FG02-94ER14466; NA0001974

OSTI ID:: 1410346

Alternate ID(s):: OSTI ID: 1408263
OSTI ID: 1413318

Report Number(s):: IS-J--9507

Journal Information:: Physical Review B, Journal Name: Physical Review B Journal Issue: 18 Vol. 96; ISSN 2469-9950; ISSN PRBMDO

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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