Two types of magnetism in the magnetic superconductor TmNi2B2C related to the degree of carbon-site occupancy

A. M. Mulders; P. C. M. Gubbens; U. Gasser; C. Baines; K. H. J. Buschow

doi:10.1103/PhysRevB.57.10320

← Back to search

Two types of magnetism in the magnetic superconductor TmNi2B2C related to the degree of carbon-site occupancy

A. M. Mulders, P. C. M. Gubbens, U. Gasser, C. Baines, K. H. J. Buschow

DOI 10.1103/PhysRevB.57.10320 · Physical Review B

T1

Active bibliographic source — not scientific approval

Bibliographic access preserves source history; it does not approve extracted materials or validate reported claims. Review warnings on each occurrence separately.

Abstract

A combined 169Tm Mössbauer spectroscopy and μ+SR (muon spin rotation) study is presented on a polycrystalline sample of TmNi2B2C. The first experimental technique shows the coexistence of two types of Tm 4f magnetism at 0.3 K, one related to a magnetic Tm moment of 4.3(1)μB and the other to a small Tm moment of ∼0.1μB. This second type of magnetism is suggested to be caused by carbon vacancies present in TmNi2B2C. These C vacancies locally modify the crystalline electric field and therefore the Tm 4f magnetism. Since these vacancies are ideal cavities in which muons can reside, it is suggested that μ+SR only probes this ∼0.1μB magnetism.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
TmNi2B2C Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	10.3	Pressure not reported	unknown
TmNi2B2C Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	10.8	Pressure not reported	unknown
DyNi2B2C Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	6	Pressure not reported	unknown