German

Helfrich, Reiner (1998):
Kalorimetrische Untersuchungen an Schwere-Fermionen-Systemen.
Delmenhorst: Der Neue Verlag, 1998. 276 S, Delmenhorst, Der Neue Verlag, TU Darmstadt,
[Ph.D. Thesis]

Steglich, Frank ; Buschinger, ; Gegenwart, ; Lohmann, ; Helfrich, Reiner ; Langhammer, ; Hellmann, ; Donnevert, ; Thomas, ; Buschinger, ; Gegenwart, ; Lohmann, ; Helfrich, Reiner ; Langhammer, ; Hellmann, ; Donnevert, ; Thomas, (1996):
Quantum critical phenomena in undoped heavy-fermion metals.
In: Journal of physics: Condensed matter. 8 (1996), S. 9909, [Article]

English

Köppen, Manfred ; Lang, Michael ; Helfrich, Reiner ; Steglich, Frank ; Thalmeier, P. ; Schmidt, B. ; Wand, B. ; Pankert, D. ; Benner, Hartmut (1999):
Solitary magnetic excitations in the low-carrier density, one-dimensional S=1/2 antiferromagnet Yb4As3.
In: Physical review letters, 82, p. 4548. [Article]

Kromer, F. ; Helfrich, Reiner ; Lang, Michael ; Steglich, Frank ; Langhammer, C. ; Bach, A. ; Michels, T. ; Kim, J. S. ; Stewart, G. R. (1998):
Revision of the phase diagram of superconducting U1-xThxBe13.
In: Physical Review Letters, 81 (20), p. 4476. ISSN 0031-9007,
DOI: 10.1103/PhysRevLett.81.4476,
[Article]

Steglich, Frank ; Geibel, Christoph ; Helfrich, Reiner ; Kromer, F. ; Lang, Michael ; Sparn, Günter ; Gegenwart, P. ; Donnevert, Lars ; Langhammer, C. (1998):
CeCu2Si2 and UBe13: new questions - old answers?
In: Journal of Physics and Chemistry of Solids, 59 (10-12), p. 2190. Elsevier Science Publishing, ISSN 0022-3697,
DOI: 10.1016/S0022-3697(98)00212-1,
[Article]

Kromer, F. ; Helfrich, Reiner ; Lang, Michael ; Steglich, Frank ; Langhammer, C. ; Bach, A. ; Michels, T. ; Kim, J. S. ; Stewart, G. R. (1998):
UBe13: another phase transition below Tc?
In: Chinese Journal of Physics, 36 (2-II), pp. 157-170. ISSN 0577-9073,
[Article]

Gegenwart, Philipp ; Langhammer, ; Geibel, Christoph ; Helfrich, Reiner ; Lang, Michael ; Sparn, ; Steglich, Frank ; Horn, ; Donnevert, (1998):
Breakup of heavy fermions on the brink of 'Phase A' in CeCu2Si2.
In: Physical review letters. 81 (1998), S. 1501, [Article]

Helfrich, Reiner ; Köppen, M. ; Lang, Michael ; Steglich, Frank ; Ochiai, A. (1998):
New observations concerning the low-temperature properties of the carrier-poor heavy-fermion system Yb4As3.
In: Journal of magnetism and magnetic materials. 177-181 (1998), S. 309, [Article]

Langhammer, C. ; Helfrich, Reiner ; Bach, A. ; Kromer, F. ; Lang, Michael ; Michels, T. ; Deppe, M. ; Steglich, Frank ; Stewart, G. R. (1998):
Evidence for the existence of two variants of UBe13.
In: Journal of magnetism and magnetic materials, 177-181 (Part 1), p. 443. Elsevier Science Publishing, ISSN 0304-8853,
DOI: 10.1016/S0304-8853(97)00690-2,
[Article]

Steglich, Frank ; Gegenwart, P. ; Geibel, Christoph ; Helfrich, Reiner ; Hellmann, P. ; Lang, Michael ; Link, A. ; Modler, R. ; Sparn, G. ; Büttgen, N. ; Loidl, A. (1996):
New observations concerning magnetism and superconductivity in heavy-fermion metals.
In: Physica B: Condensed matter, 223-224, pp. 1-8. Elsevier, ISSN 0921-4526,
DOI: 10.1016/0921-4526(96)00026-9,
[Article]